A fast moving storm dumped a few inches of snow on Potomac and the rest of the region beginning before dawn and continuing through the rush hour on Tuesday, Jan. 6, bringing 4-6 inches of snow in some places, more than predicted, with temperatures in the 20s. Montgomery County Police and local fire and rescue companies reported responding to dozens of accidents on icy roads. County schools were closed for the day. Montgomery County residents are required by law to clear sidewalks in front of and alongside their properties within 24 hours of the end of a snowstorm.