Update at 9:55 p.m. — The warning has been cancelled.
Earlier: Portions of Arlington County are under a Severe Thunderstorm Warning until 10 p.m.
Forecasters say the storm is packing winds of 60 miles per hour or stronger, as well as possible quarter-sized hail.
More from the National Weather Service:
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR… THE DISTRICT OF COLUMBIA… SOUTHEASTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND… NORTHWESTERN PRINCE GEORGES COUNTY IN CENTRAL MARYLAND… ARLINGTON COUNTY IN NORTHERN VIRGINIA… THE NORTH CENTRAL CITY OF FALLS CHURCH IN NORTHERN VIRGINIA… NORTHEASTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA… * UNTIL 1000 PM EDT. * AT 918 PM EDT, A SEVERE THUNDERSTORM WAS LOCATED OVER AMERICAN LEGION BRIDGE, MOVING EAST AT 30 MPH. HAZARD…60 MPH WIND GUSTS AND QUARTER SIZE HAIL. SOURCE…RADAR INDICATED. IMPACT…DAMAGING WINDS WILL CAUSE SOME TREES AND LARGE BRANCHES TO FALL. THIS COULD INJURE THOSE OUTDOORS, AS WELL AS DAMAGE HOMES AND VEHICLES. ROADWAYS MAY BECOME BLOCKED BY DOWNED TREES. LOCALIZED POWER OUTAGES ARE POSSIBLE. UNSECURED LIGHT OBJECTS MAY BECOME PROJECTILES. * LOCATIONS IMPACTED INCLUDE… ARLINGTON, BETHESDA, BOWIE, COLLEGE PARK, GREENBELT, LANGLEY PARK, VIENNA, FORESTVILLE, FALLS CHURCH, LARGO, CORAL HILLS, BLADENSBURG, PIMMIT HILLS, MCLEAN, FEDEX FIELD, AMERICAN LEGION BRIDGE, FORT TOTTEN, ROSSLYN, CRYSTAL CITY AND UNIVERSITY OF MARYLAND. PRECAUTIONARY/PREPAREDNESS ACTIONS… FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING. && HAIL…1.00IN WIND…60MPH
Severe Thunderstorm Warning including Washington DC, Arlington VA, Silver Spring MD until 10:00 PM EDT pic.twitter.com/SD1ZSbGpXX
— NWS DC/Baltimore (@NWS_BaltWash) July 21, 2019
Severe tstorm warning issued for DC, Southern MoCo as small but potent storm heads toward the city. Thousands gathered at the Mall for #Apollo50 should have a shelter plan in mind next 30 min. pic.twitter.com/jjiJ8mnphj
— Capital Weather Gang (@capitalweather) July 21, 2019