At 552 AM EDT, Doppler radar was tracking a strong thunderstorm near Meridian, or 8 miles west of Butler, moving northeast at 40 mph. HAZARD. Wind gusts up to 40 mph. SOURCE. Radar indicated. IMPACT. Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include. Butler, Oil City, Grove City, Franklin, Clarion, Marienville, Knox, Rimersburg, Homeacre-Lyndora, Sugarcreek, Shanor-Northvue, Meridian, Slippery Rock, Meadowood, Oak Hills, Tionesta, Hasson Heights, Nixon, Prospect, and Stoneboro. This includes the following highways. Interstate 79 in Pennsylvania between mile markers 90 and 115. Interstate 80 in Pennsylvania between mile markers 20 and 68.

* WHAT. High risk of rip currents expected. * WHERE. In Ohio, Cuyahoga, Lake and Ashtabula Lakeshore Counties. In Pennsylvania, Northern Erie County. * WHEN. From 2 PM EDT this afternoon through Tuesday evening. * IMPACTS. Wind and wave action will cause currents on the lakeshore. Swimmers should not enter the water. Currents can carry swimmers away from shore through a sand bar and along structures extending out into the lake.

* WHAT. West winds 15 to 25 knots and waves 4 to 7 feet expected. * WHERE. The nearshore waters of Lake Erie from Avon Point OH to Ripley NY. * WHEN. From 2 PM this afternoon to 8 PM EDT Tuesday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Southwest winds 15 to 25 knots and waves 5 to 8 feet expected. * WHERE. The nearshore waters of Lake Erie from Ripley to Buffalo. * WHEN. From 2 PM this afternoon to 8 PM EDT Tuesday. * IMPACTS. Winds and/or waves will cause hazardous conditions that could capsize or damage small craft.