Heavy rain and flash flooding are possible in Austin and the surrounding areas on Friday evening. The National Weather Service issued a flash flood warning for western Williamson County and northeastern Burnet Counties at 5:45 p.m. as storms moved in, issuing an alert that cities including Cedar Park, Georgetown, Leander, Liberty Hill and Florence should expect floods. The warning is in effect until 10 p.m. Friday. “2-3 inches has already fallen with more on the way.