Update at 3:35 p.m. — A Severe Thunderstorm Warning and Flash Flood Warning have been issued.
In addition to a Heat Advisory and a Severe Thunderstorm Watch, Arlington, D.C. and surrounding area are also now under a Flash Flood Watch.
The watch is in effect until 11 p.m. The National Weather Service says storms packing torrential rains may cause localized flooding.
More from NWS:
136 PM EDT WED JUL 22 2020
…FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING…
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
* FLASH FLOOD WATCH…
* UNTIL 11 PM EDT THIS EVENING
* THUNDERSTORMS WITH LOCALLY HEAVY RAIN ARE EXPECTED ACROSS THE WATCH AREA THIS AFTERNOON AND EVENING. RAINFALL OF 1 TO 3 INCHES MAY FALL WITHIN AN HOUR, RESULTING IN LOCALIZED FLASH FLOODING.
A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.
Flash Flood Watch until 11 PM pic.twitter.com/GA144bSV5g
— NWS Baltimore-Washington (@NWS_BaltWash) July 22, 2020