Arlington and much of the D.C. area will be under a Flood Watch starting tonight.
Heavy rain and storms are expected tonight. The rain is expected to persist through Saturday afternoon, raising the possibility of flooding, including flash flooding caused by “excessive rainfall.”
The Flood Watch takes effect at 11 p.m.
From the National Weather Service:
URGENT – IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1253 PM EDT FRI JUL 8 2022…FLOOD WATCH IN EFFECT FROM 11 PM EDT THIS EVENING THROUGH SATURDAY AFTERNOON…
* WHAT…FLASH FLOODING CAUSED BY EXCESSIVE RAINFALL IS POSSIBLE.
* WHERE…WASHINGTON DC, MARYLAND AND NORTHERN VIRGINIA, INCLUDING THE FOLLOWING AREAS: IN DC, DISTRICT OF COLUMBIA. IN MARYLAND, ANNE ARUNDEL, CARROLL, CENTRAL AND SOUTHEAST HOWARD, CENTRAL AND SOUTHEAST MONTGOMERY, FREDERICK MD, NORTHERN BALTIMORE, NORTHWEST HARFORD, NORTHWEST HOWARD, NORTHWEST MONTGOMERY, PRINCE GEORGES, SOUTHEAST HARFORD AND SOUTHERN BALTIMORE. IN NORTHERN VIRGINIA, ARLINGTON/FALLS CHURCH/ALEXANDRIA, EASTERN LOUDOUN, FAIRFAX, PRINCE WILLIAM/MANASSAS/MANASSAS PARK AND WESTERN LOUDOUN.
* WHEN…FROM 11 PM EDT THIS EVENING THROUGH SATURDAY AFTERNOON.
* IMPACTS…EXCESSIVE RUNOFF MAY RESULT IN FLOODING OF RIVERS, CREEKS, STREAMS, AND OTHER LOW-LYING AND FLOOD-PRONE LOCATIONS.
* ADDITIONAL DETAILS…
– SHOWERS ARE EXPECTED WITH SCATTERED THUNDERSTORMS LATE THIS EVENING INTO MIDDAY SATURDAY. AVERAGE RAINFALL AMOUNTS AROUND 1 TO 3 INCHES ARE EXPECTED, BUT LOCALIZED AMOUNTS AROUND 4 TO 7 INCHES IN HEAVIER SHOWERS AND THUNDERSTORMS. RAINFALL AMOUNTS AROUND 1 TO 3 INCHES WITHIN AN HOUR OR TWO ARE POSSIBLE IN AREAS WHERE THE HEAVIEST RAINFALL OCCURS. THE BEST CHANCE FOR THE HEAVIEST RAINFALL WILL BE OVERNIGHT INTO SATURDAY MORNING.