* WHAT. Heat index values in the upper 90s and lower 100s. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

SMWCLE The National Weather Service in Cleveland has issued a * Special Marine Warning for. Nearshore and Open waters from Vermilion OH to Geneva-on-the-lake OH. * Until 245 PM EDT. * At 114 PM EDT, strong thunderstorms were located along a line extending from near Fairport Harbor to 6 nm north of Cleveland to near Avon Point, moving northeast at 15 knots. HAZARD. Wind gusts 34 knots or greater and small hail. SOURCE. Radar. IMPACT. Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include. Lorain Harbor, Geneva-On-The-Lake, and Cleveland.

* WHAT. Heat index values ranging from 100 to 105 degrees. * WHERE. Portions of east central Ohio, northwest, southwest, and western Pennsylvania, and northern and the northern panhandle of West Virginia. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. A prolonged period of dangerously hot conditions with heat index values near 100 degrees. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky and central, south central, southwest and west central Ohio. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. Heat index values of 100 to 104 degrees are expected at times this week with variability each day due to clouds and scattered showers and storms. * WHERE. Portions of north central, northeast, and northwest Ohio and northwest Pennsylvania. * WHEN. Until 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. The prolonged nature of the heat may increase heat stress with time.

An Air Quality Advisory for ground level ozone has been issued by the Northeast Ohio Areawide Coordinating Agency for Ashtabula, Cuyahoga, Geauga, Lake, Lorain, Medina, Portage and Summit Counties. The advisory is from midnight tonight to midnight Tuesday night. Air quality levels will be unhealthy for sensitive groups during this period. If you are in the sensitive groups category of children, the elderly and those with breathing difficulties, please monitor your outdoor activity and check air quality readings at airnow.gov. Additionally, sign-up at enviroflash.info for text alerts regarding air quality. To help our region reduce air pollution: * Drive less: bike, walk, use transit, work from home, combine trips * Visit gohiocommute.com/noaca - Find a smarter way to travel! * Don't idle - Turn off your engine * Refill your tank after sunset * Wait to mow the lawn

An Air Quality Advisory for ground level ozone has been issued by the Northeast Ohio Areawide Coordinating Agency for Ashtabula, Cuyahoga, Geauga, Lake, Lorain, Medina, Portage and Summit Counties. The advisory is from midnight tonight to midnight Tuesday night. Air quality levels will be unhealthy for sensitive groups during this period. If you are in the sensitive groups category of children, the elderly and those with breathing difficulties, please monitor your outdoor activity and check air quality readings at airnow.gov. Additionally, sign-up at enviroflash.info for text alerts regarding air quality. To help our region reduce air pollution: * Drive less: bike, walk, use transit, work from home, combine trips * Visit gohiocommute.com/noaca - Find a smarter way to travel! * Don't idle - Turn off your engine * Refill your tank after sunset * Wait to mow the lawn

SVRCLE The National Weather Service in Cleveland has issued a * Severe Thunderstorm Warning for. Southwestern Cuyahoga County in northeastern Ohio. North central Medina County in northeastern Ohio. Northeastern Lorain County in north central Ohio. * Until 245 PM EDT. * At 154 PM EDT, a severe thunderstorm was located near North Olmsted, or 10 miles east of Elyria, moving northeast at 15 mph. HAZARD. 60 mph wind gusts and quarter size hail. SOURCE. Radar indicated. IMPACT. Minor damage to vehicles is possible. Expect damage to trees and power lines. * Locations impacted include. Cleveland, Elyria, Parma, Lakewood, Strongsville, Brunswick, Westlake, North Royalton, North Ridgeville, Avon Lake, Grafton, North Olmsted, Avon, Parma Heights, Rocky River, Broadview Heights, Brook Park, Berea, Fairview Park, and Middleburg Heights.