The National Weather Service in Columbia has issued a severe thunderstorm warning for the southern portion of Lancaster County until 3:30 p.m. Friday, Sept. 1. At 2:33 p.m., National Weather Service Doppler radar indicated a severe thunderstorm capable of producing damaging winds in excess of 70 mph about 8 miles east of Winnsboro and moving east/northeast toward Lancaster at an estimated 40 mph. Hail damage to vehicles and tree damage is expected.