* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Cold temperatures could also extend into Wednesday and Wednesday night with sub-zero wind chills.

* WHAT. An extended period of temperatures up to 30 degrees below normal. Dangerously cold wind chills as low as 25 below zero possible. Wind chills as low as 30 below zero are possible for higher elevations. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From late Sunday night through Thursday morning. The coldest period is most likely from Monday to early Wednesday, with the coldest wind chills during the morning hours Tuesday and Wednesday. * IMPACTS. Periods of dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. An extended period of freezing temperatures could cause ruptured water pipes.

* WHAT. Dangerously cold wind chills as low as 20 and 25 below zero possible at times. * WHERE. The Northern and Western Mountains of Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Cold temperatures could also extend into Wednesday and Wednesday night with sub-zero wind chills.

* WHAT. Dangerously cold wind chills of 20 to 25 below zero possible at times. * WHERE. A portion of central Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* WHAT. An extended period of temperatures up to 30 degrees below normal. Dangerously cold wind chills as low as 25 below zero possible. Wind chills as low as 30 below zero are possible for higher elevations. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From late Sunday night through Thursday morning. The coldest period is most likely from Monday to early Wednesday, with the coldest wind chills during the morning hours Tuesday and Wednesday. * IMPACTS. Periods of dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. An extended period of freezing temperatures could cause ruptured water pipes.

* WHAT. Heavy lake effect snow possible. Significant accumulations possible in the most persistent lake snows. * WHERE. Wyoming, Chautauqua, Cattaraugus, and Southern Erie Counties. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The potential exists for a significant long duration lake effect snow event. There is considerable uncertainty in exact band placement and amounts, but multiple periods of heavy snow are possible. Travel could be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Cold temperatures could also extend into Wednesday and Wednesday night with sub-zero wind chills.

* WHAT. An extended period of temperatures up to 30 degrees below normal. Dangerously cold wind chills as low as 25 below zero possible. Wind chills as low as 30 below zero are possible for higher elevations. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From late Sunday night through Thursday morning. * IMPACTS. Periods of dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. An extended period of freezing temperatures could cause ruptured water pipes.

* WHAT. Dangerously cold wind chills as low as 25 below zero possible. * WHERE. A portion of central Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Cold temperatures could also extend into Wednesday and Wednesday night with sub-zero wind chills.

* WHAT. Heavy lake effect snow possible. Significant accumulations possible in the most persistent lake snows. * WHERE. Wyoming, Chautauqua, Cattaraugus, and Southern Erie Counties. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The potential exists for a significant long duration lake effect snow event. There is considerable uncertainty in exact band placement and amounts, but multiple periods of heavy snow are possible. Travel could be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Wind chills will be as cold as -20 through Tuesday morning. Low temperatures on Tuesday night will range from -5 to -15 with wind chills values as low as -25 degrees. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater possible, and may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From late Sunday night through late Tuesday night. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater possible. Resulting ice may accumulate rapidly on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From late Sunday night through late Tuesday night. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Dangerously cold wind chills as low as 23 below zero possible. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From late Sunday night through Thursday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. An extended period of freezing temperatures could cause ruptured water pipes.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater possible. Resulting ice may accumulate rapidly on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From late Sunday night through late Tuesday night. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Dangerously cold wind chills as low as 25 below zero possible. * WHERE. A portion of central Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater possible. Resulting ice may accumulate rapidly on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From late Sunday night through late Tuesday night. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. An extended period of very cold temperatures are expected with dangerously cold wind chills as low as -25 possible. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The long duration of this cold will lead to greater impacts to infrastructure, including increased risk of frozen pipes, dead car batteries, and structure fires. There is an increased risk of carbon monoxide poisoning from improper use of secondary heat indoors. * ADDITIONAL DETAILS. Wind chills will be as cold as -20 through Tuesday morning. Low temperatures on Tuesday night will range from -5 to -15 with wind chills values as low as -25 degrees. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. An extended period of very cold temperatures are expected, with daytime highs in the single digits to the mid teens and overnight lows 5 to 15 degrees below zero. Dangerously cold wind chills as low as 25 below zero possible. * WHERE. Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN. From late Sunday night through Thursday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. An extended period of freezing temperatures could cause ruptured water pipes.

* WHAT. Very cold wind chills as low as 19 below zero expected. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From 1 AM Monday to 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 19 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Dangerously cold wind chills as low as 25 below possible. * WHERE. A portion of central Pennsylvania. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Exposed skin may become quickly frostbitten or frozen.

* WHAT. Heavy lake effect snow possible. Significant accumulations possible in the most persistent lake snows. * WHERE. Wyoming, Chautauqua, Cattaraugus, and Southern Erie Counties. * WHEN. From late Sunday night through Wednesday morning. * IMPACTS. The potential exists for a significant long duration lake effect snow event. There is considerable uncertainty in exact band placement and amounts, but multiple periods of heavy snow are possible. Travel could be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater possible, and may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From late tonight through late Tuesday night. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From 1 AM Monday to 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Monday morning will be in the single digits for most with wind chill values as low as 20 below. Low temperatures Monday night into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 13 below zero. Wind chill values will be as cold as 24 below, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Heavy lake effect snow expected. Total snow accumulations 10 to 20 inches in the most persistent lake snows, primarily across northern portions of the county. Winds gusting as high as 35 mph will also produce some blowing and drifting snow. * WHERE. Chautauqua County. * WHEN. From 7 PM this evening to 10 AM EST Wednesday. The heaviest and most impactful snowfall is expected between Monday and Tuesday evening. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. From 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Very cold wind chills as low as 19 below zero expected. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From 1 AM Monday to 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 19 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. From 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From 1 AM Monday to 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Monday morning will be in the single digits for most with wind chill values as low as 20 below. Low temperatures Monday night into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 13 below zero. Wind chill values will be as cold as 24 below, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Very cold wind chills as low as 20 below zero expected. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. From 4 AM Monday to noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken.

* WHAT. Very cold wind chills as low as 20 below zero expected. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. From 4 AM Monday to noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken.

* WHAT. Heavy lake effect snow expected. Total snow accumulations 10 to 20 inches in the most persistent lake snows, primarily across northern portions of the county. Winds gusting as high as 35 mph will also produce some blowing and drifting snow. * WHERE. Chautauqua County. * WHEN. From 7 PM this evening to 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Bitterly cold wind chills 15 below to 20 below zero expected. * WHERE. Southern Erie and Wyoming counties and the western Southern Tier. * WHEN. From 4 PM Monday to 11 AM EST Wednesday. * IMPACTS. Bitterly cold wind chills as low as 20 below zero will cause frostbite on exposed skin in as little as 30 minutes. Such wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet expected. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Small Craft Advisory, from 11 PM this evening to 5 AM EST Wednesday. For the Heavy Freezing Spray Warning, from 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet expected. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Small Craft Advisory, from 11 PM this evening to 5 AM EST Wednesday. For the Heavy Freezing Spray Warning, from 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From 1 AM Monday to 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Monday morning will be in the single digits for most with wind chill values as low as 20 below. Low temperatures Monday night into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 13 below zero. Wind chill values will be as cold as 24 below, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Very cold wind chills as low as 20 below expected. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. From 4 AM Monday to noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken.

* WHAT. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet expected. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Small Craft Advisory, until 5 AM EST Wednesday. For the Heavy Freezing Spray Warning, from 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet expected. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Small Craft Advisory, until 5 AM EST Wednesday. For the Heavy Freezing Spray Warning, from 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Heavy lake effect snow expected. Total snow accumulations 10 to 20 inches in the most persistent lake snows, primarily across northern portions of the county. Winds gusting as high as 35 mph will also produce some blowing and drifting snow. * WHERE. Chautauqua County. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Bitterly cold wind chills 15 below to 20 below zero expected. * WHERE. Southern Erie and Wyoming counties and the western Southern Tier. * WHEN. From 4 PM Monday to 11 AM EST Wednesday. * IMPACTS. Bitterly cold wind chills as low as 20 below zero will cause frostbite on exposed skin in as little as 30 minutes. Such wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Very cold wind chills as low as 20 below expected. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. From 4 AM Monday to noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. From 1 AM Monday to 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Monday morning will be in the single digits for most with wind chill values as low as 20 below zero. Low temperatures Monday night into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below zero. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 13 below zero. Wind chill values will be as cold as 24 below zero, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater expected, and may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. From 1 AM Monday to 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Heavy lake effect snow. Additional snow accumulations 10 to 20 inches in the most persistent lake snows across the northern half of the county. Winds gusting as high as 35 mph will also produce some localized blowing and drifting snow near the lakeshore. * WHERE. Chautauqua County, mainly across the northern half of the county. * WHEN. Until 10 AM EST Wednesday. The heaviest and most impactful snowfall is expected between tonight and Tuesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Very cold wind chills as low as 22 below zero expected. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. From 1 AM Monday to 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 19 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Very cold wind chills as low as 23 below zero. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. Until 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Temperatures this morning are in the single digits for most with wind chill values as low as 20 below zero. Low temperatures tonight into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below zero. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 12 below zero. Wind chill values will be as cold as 24 below zero, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Bitterly cold wind chills 15 below to 20 below zero expected. * WHERE. Southern Erie and Wyoming counties and the western Southern Tier. * WHEN. From 4 PM this afternoon to 11 AM EST Wednesday. * IMPACTS. Bitterly cold wind chills as low as 20 below zero will cause frostbite on exposed skin in as little as 30 minutes. Such wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Heavy lake effect snow. Additional snow accumulations 10 to 20 inches in the most persistent lake snows across the northern half of the county. Winds gusting as high as 35 mph will also produce some localized blowing and drifting snow near the lakeshore. * WHERE. Chautauqua County, mainly across the northern half of the county. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. Until 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Very cold wind chills as low as 20 below zero expected. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. Until noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken.

* WHAT. Heavy lake effect snow. Additional snow accumulations 10 to 20 inches in the most persistent lake snows across the northern half of the county. Winds gusting as high as 35 mph will also produce some localized blowing and drifting snow near the lakeshore. * WHERE. Chautauqua County, mainly across the northern half of the county. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds 15 to 25 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Temperatures this morning are in the single digits for most with wind chill values as low as 20 below zero. Low temperatures tonight into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below zero. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 12 below zero. Wind chill values will be as cold as 24 below zero, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Very cold wind chills as low as 23 below zero. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Bitterly cold wind chills 15 below to 20 below zero expected. * WHERE. Southern Erie and Wyoming counties and the western Southern Tier. * WHEN. From 4 PM this afternoon to 11 AM EST Wednesday. * IMPACTS. Bitterly cold wind chills as low as 20 below zero will cause frostbite on exposed skin in as little as 30 minutes. Such wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. Until 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Heavy lake effect snow. Additional snow accumulations 10 to 20 inches in the most persistent lake snows across the northern third of the county. Winds gusting as high as 35 mph will also produce some localized blowing and drifting snow near the lakeshore. * WHERE. Chautauqua County, mainly across the northern third of the county. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Very cold wind chills as low as 22 below. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. Until noon EST Wednesday. * IMPACTS. The dangerously cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds to 30 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds to 30 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below zero. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 15 below zero. Wind chill values will be as cold as 24 below zero, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Very cold wind chills as low as 24 below zero expected. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. The cold wind chills as low as 24 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS. Low temperatures tonight into Tuesday morning will be in the range of 5 above to 5 below zero with wind chill values as low as 20 below zero. Low temperatures Tuesday night into Wednesday morning will be the coldest of the stretch, ranging from zero to 15 below zero. Wind chill values will be as cold as 24 below zero, but could trend colder. Lingering cold with sub zero wind chills could continue through Wednesday night.

* WHAT. Lake effect snow. Total snow accumulations 2 to 4 inches. * WHERE. Northern Erie County. * WHEN. Until 7 AM EST Tuesday. * IMPACTS. Plan on slippery road conditions and visibility as low as one-half of a mile or less in falling and blowing snow. The hazardous conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS. A band of lake effect snow over Lake Erie will settle near or along the lakeshore tonight into early Tuesday morning. The highest snowfall totals will likely occur from roughly Presque Isle State Park to North East, Pennsylvania.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds to 30 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. For the Heavy Freezing Spray Warning, heavy freezing spray at a rate of 2 cm per hour or greater may rapidly accumulate on vessels. For the Small Craft Advisory, west winds to 30 knots and waves 6 to 9 feet. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. For the Heavy Freezing Spray Warning, until 1 AM EST Wednesday. For the Small Craft Advisory, until 5 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.

* WHAT. Very cold wind chills as low as 20 below zero. * WHERE. Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Sullivan, Tioga, and Warren Counties. * WHEN. Until noon EST Wednesday. * IMPACTS. Frostbite and hypothermia are possible if precautions are not taken. * ADDITIONAL DETAILS. The lowest wind chills will be during the late night and early morning hours.

* WHAT. Heavy lake effect snow. Additional snow accumulations 10 to 20 inches in the most persistent lake snows across the northern third of the county. Winds gusting as high as 35 mph will also produce some localized blowing and drifting snow near the lakeshore. * WHERE. Chautauqua County. * WHEN. Until 10 AM EST Wednesday. * IMPACTS. Travel will be very difficult with very poor visibility and deep snow cover on roads.

* WHAT. Heavy freezing spray at a rate of 2 cm per hour or greater. Resulting ice may accumulate rapidly on vessels. * WHERE. The open waters of Lake Erie from Avon Point OH to Buffalo NY. * WHEN. Until 1 AM EST Wednesday. * IMPACTS. Operating a vessel in heavy freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Rapid ice accretion on decks and superstructures may result in a catastrophic loss of stability.

* WHAT. Bitterly cold wind chills 15 below to 20 below zero expected. * WHERE. Southern Erie and Wyoming counties and the western Southern Tier. * WHEN. Until 11 AM EST Wednesday. * IMPACTS. Bitterly cold wind chills as low as 20 below zero will cause frostbite on exposed skin in as little as 30 minutes. Such wind chill values can lead to hypothermia with prolonged exposure.

* WHAT. Very cold wind chills as low as 15 to 20 below zero. * WHERE. Portions of east central Ohio, western Pennsylvania, and northern West Virginia. * WHEN. Until 1 PM EST Wednesday. * IMPACTS. The dangerously cold wind chills from 15 to 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. Wind chill values can lead to hypothermia with prolonged exposure.