Isaias made landfall in North Carolina last night as a Category 1 hurricane and is now approaching the D.C. area as a tropical storm.
Wind from the storm is expected to ramp up locally over the next hour, but the main threat remains heavy rain.
The National Weather Service issued a Flood Warning this morning for Arlington, Alexandria, Falls Church and parts of Fairfax. Several additional inches of rain are likely to fall and cause flooding, forecasters say.
More from NWS:
BULLETIN – IMMEDIATE BROADCAST REQUESTED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
701 AM EDT TUE AUG 4 2020
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
* FLOOD WARNING FOR…
THE CITY OF FAIRFAX IN NORTHERN VIRGINIA…
ARLINGTON COUNTY IN NORTHERN VIRGINIA…
THE CITY OF FALLS CHURCH IN NORTHERN VIRGINIA…
EASTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA…
THE CITY OF ALEXANDRIA IN NORTHERN VIRGINIA…
* UNTIL 100 PM EDT.
* AT 700 AM EDT, DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED THAT HEAVY RAIN WAS FALLING OVER THE AREA. THE HEAVY RAIN WILL CAUSE FLOODING. UP TO ONE INCH OF RAIN HAS ALREADY FALLEN.ADDITIONAL RAINFALL AMOUNTS OF SEVERAL INCHES ARE POSSIBLE, AND FLASH FLOOD WARNINGS COULD BE REQUIRED LATER TODAY. FOR NOW, THOUGH, FLOODING WILL BE RELATIVELY SLOW TO DEVELOP.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE… ARLINGTON, ALEXANDRIA, RESTON, ANNANDALE, SPRINGFIELD, FORT WASHINGTON, FAIRFAX, FORT HUNT, VIENNA, GROVETON, FALLS CHURCH, HUNTINGTON, MANTUA, FORT BELVOIR, PIMMIT HILLS, NATIONAL HARBOR, MCLEAN, REAGAN NATIONAL AIRPORT, ROSSLYN AND CRYSTAL CITY.
TURN AROUND, DON’T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES.
A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. ALL INTERESTED PARTIES SHOULD TAKE NECESSARY PRECAUTIONS IMMEDIATELY.
Isaias is moving NE across NC, crossing our region through the early PM. Heavy rain will intensify with significant flood potential, especially near & east of I-95. Winds will also increase in these areas, with wind damage possible. Tornadoes also possible, mainly near the Bay. pic.twitter.com/wUyXqUxsuz
— NWS Baltimore-Washington (@NWS_BaltWash) August 4, 2020
— NWS WPC (@NWSWPC) August 4, 2020
#Alert The strongest bands of Tropical Storm #Isaias will be moving into our area throughout the morning. The main risk is flash flooding. Avoid areas known to flood, as water rise can be rapid. Do not attempt to drive through flooded roadways. #TurnAroundDontDrown @ArlingtonVA pic.twitter.com/0DGh80jRnA
— Arlington Fire (@ArlingtonVaFD) August 4, 2020