The National Weather Service issued a flood watch for Montgomery County Tuesday, beginning at 3 p.m. and continuing into the evening.
The DC area should expect 1-2 inches of moderate to heavy rainfall. A flood watch means that there is potential for flooding, and the NWS warns that locally heavy rainfall could cause small streams to overflow their banks.
Montgomery County Fire and Rescue Services warns drivers to "Turn Around - Don't Drown" if 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.
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.