Arlington and much of the D.C. region is under a Flood Watch today as another big batch of rain moves into the area.
With the ground already saturated, any significant rainfall can cause ponding or even more serious flooding.
More from the National Weather Service:
…FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH LATE TONIGHT… THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLOOD WATCH FOR PORTIONS OF MARYLAND, THE DISTRICT OF COLUMBIA, AND VIRGINIA, INCLUDING THE FOLLOWING AREAS, IN MARYLAND, CARROLL, CENTRAL AND SOUTHEAST HOWARD, CENTRAL AND SOUTHEAST MONTGOMERY, NORTHWEST HOWARD, AND NORTHWEST MONTGOMERY. THE DISTRICT OF COLUMBIA. IN VIRGINIA, ALBEMARLE, ARLINGTON/FALLS CHURCH/ALEXANDRIA, CENTRAL VIRGINIA BLUE RIDGE, CULPEPER, EASTERN LOUDOUN, FAIRFAX, GREENE, MADISON, NELSON, ORANGE, PRINCE WILLIAM/MANASSAS/MANASSAS PARK, SOUTHERN FAUQUIER, AND STAFFORD. * FROM THIS EVENING THROUGH LATE TONIGHT * A WAVE OF LOW PRESSURE WILL RIDE NORTHEAST ALONG A STALLED FRONT LATER TODAY AND TONIGHT. SEVERAL INCHES OF RAIN IS POSSIBLE, AND WITH THE GROUND ALREADY SATURATED, FLOODING IS POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS… A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. &&
Heavy rainfall is expected today through tonight. Due to saturated ground and high river levels, small stream and river flooding is possible particularly west of the Blue Ridge and the Potomac River. A Flood Watch is now in effect through tonight. #DCwx #MDwx #VAwx #WVwx pic.twitter.com/bsoFiueX9g
— NWS DC/Baltimore (@NWS_BaltWash) September 27, 2018
Rain is currently moving through our region and is expected to become more widespread this afternoon. A flood watch is in place for most of the region due to the ground being saturated from previous rain events. pic.twitter.com/NERyBWUHMR
— NWS DC/Baltimore (@NWS_BaltWash) September 27, 2018