The heavy rains that are expected are coming just 24 hours after a deluge in Reston Wednesday night. The rain flooded several roads, and rescue crews had rescue several motorists trapped in their cars in the swift water.
The Flash Flood Watch is in effect until midnight tonight.
From the NWS:
WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CROSS THE AREA THIS AFTERNOON INTO THIS EVENING. PORTIONS OF THE AREA HAVE RECEIVED HEAVY RAINFALL IN THE LAST WEEK…AND AS LITTLE AS ONE INCH OF RAIN IN ONE HOUR COULD PRODUCE FLASH FLOODING.
SMALL STREAMS AND URBAN AREAS WILL BE ESPECIALLY SUSCEPTIBLE TO
RAPID RISES OF WATER ONTO NORMALLY DRY AREAS.
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.