The National Weather Service has issued a Special Weather Statement for much of the metro Atlanta area until after 10 a.m. on Friday, Feb. 21, 2020, including Walton, Gwinnett and surrounding counties, warning of the possibility of black ice on the roads. There is a slight chance of some snow during the overnight hours, even in the local area, but no accumulations are expected.
BLACK ICE POSSIBLE OVERNIGHT… ACROSS THE FAR NORTHERN TIER INCLUDING DADE, WALKER, CATOOSA, AND WHITFIELD, A TRANSITION TO A MIX OF RAIN AND SNOW REMAINS POSSIBLE BEFORE THE PRECIPITATION EXITS LATE THIS AFTERNOON. INITIALLY TEMPERATURES WILL BE TOO WARM FOR ANY ACCUMULATIONS EXCEPT THE HIGHEST PEAKS WHERE A DUSTING TO UP TO A HALF AN INCH IS POSSIBLE. COLDER AIR WILL RUSH IN BEHIND THE PRECIPITATION WITH TEMPERATURES DROPPING BELOW FREEZING SHORTLY AFTER MIDNIGHT FOR THE FAR NORTHERN SECTIONS AND THE ATLANTA METRO SECTIONS A FEW HOURS LATER. WINDS WILL AID IN DRYING ROADS BUT ANY RESIDUAL WATER ON AREA ROADWAYS COULD RESULT IN BLACK ICE. WITH THE ABUNDANT RAINFALL OVER THE LAST FEW WEEKS, THERE WILL BE A HIGHER THAN NORMAL CHANCE OF BLACK ICE CONDITIONS ESPECIALLY WHERE WATER FLOWS THROUGH THE HIGHER ELEVATIONS AND ACROSS ROADWAYS. THIS WILL CREATE HAZARDOUS DRIVING CONDITIONS WHERE IT DOES OCCUR THROUGH THE RUSH HOUR FRIDAY MORNING. TEMPERATURES ARE EXPECTED TO RISE ABOVE FREEZING AFTER 10AM FOR MOST AREAS. FINALLY, THERE ARE A FEW WEATHER MODEL SOLUTIONS THAT SUGGEST SOME LIGHT SNOW IS POSSIBLE OVERNIGHT IN THE ATLANTA METRO DUE TO COLD AIR RUSHING OVER THE WARMER LAKE LANIER. THERE IS LOW CHANCE OF THIS OCCURRING AND ANY ACCUMULATIONS IF AT ALL WOULD BE VERY LIGHT.