Following a region-wide heatwave, a Flash Flood Watch has been issued for Reston and surrounding areas today (Monday).

The watch is in effect from the afternoon through late tonight, according to the National Weather Service.

Here’s more from the alert:

MULTIPLE ROUNDS OF SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAINFALL ARE LIKELY. AREAL AVERAGE RAINFALL OF 1 TO 1.5 INCHES IS EXPECTED, WITH ISOLATED TOTALS OF 4 INCHES POSSIBLE. MUCH OF THIS RAIN MAY FALL IN SHORT PERIODS OF TIME  IN ANY ONE GIVEN LOCATION, RESULTING IN THE RISK FOR FLASH  FLOODING MONDAY AFTERNOON INTO MONDAY NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.

The NWS encourages residents to monitor future forecasts in the event of changes.

While the heat lessens slightly Monday, the threat for heavy thunderstorms will increase. A Flash Flood Watch will be in effect from Monday afternoon through late Monday night. pic.twitter.com/YhY9COkdHy

— NWS DC/Baltimore (@NWS_BaltWash) July 21, 2019