A flash flood watch is in effect for Montgomery County and the DC region from 3 p.m. Wednesday "through late tonight," according to an alert from the National Weather Service.
A flash flood watch means that "conditions may develop that lead to flash flooding," according to the NWS. The NWS predicts one to one-and-a-half inches of rainfall in a short period of time.
The Capital Weather Gang at the Washington Post estimates that the worst of the storm will hit the DC region between 3-7 p.m.
Montgomery County Fire and Rescue Services warns drivers to "Turn Around - Don't Drown" when they come to a stretch of road covered in water. See the MCFRS website for a list of county roads that are most susceptible to flooding.
County police have issued a reminder to residents to stay clear of any trees and wires knocked down by strong winds.
The State Highway Administration reports that its teams are clearing storm water ditches and preparing high-water signs and tree removal equipment.
Evening commuters can check Patch's live traffic map to avoid the worst jams caused by the bad weather. Click on the "Commute" tab at the top of this page.