At 640 PM EDT, Doppler radar was tracking strong thunderstorms along a line extending from near Springdale to near Sumter County Airport to 6 miles south of Hebron. Movement was northeast at 35 mph. ...Boaters on Lake Wateree Should Seek Safe Harbor... HAZARD...Wind gusts of up to 40 to 45 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Lancaster, Camden, Winnsboro, Bishopville, Springdale, Lake Wateree Dam, Kershaw, Elgin, Heath Springs, Lugoff, Liberty Hill, Lake Wateree State Park, Fairfield County Airport, Westville, Woods Bay State Park, Cassatt, Elliott, Lee State Park, Carolina Sandhills Wildlife Refuge, and Mt Pisgah. This includes the following highways... Interstate 20 in South Carolina between mile markers 88 and 125. Interstate 77 between mile markers 30 and 45. Interstate 95 between mile markers 130 and 146.