Thunderstorms and rainfall of more than an inch beginning early Thursday morning is likely, according to a National Weather Service alert issued Wednesday.
A flash flood watch has been issued from 12 a.m. Thursday to Thursday evening for much of the Washington, DC region, including Montgomery and Prince George's counties and the District of Columbia.
"Another round of storms may bring heavy rain" later in the day Thursday, according to the NWS forecast. Because we've had a rainy week, it only takes about an inch of rain for flash flooding to occur in low-lying areas, NWS said.
A "watch" means that conditions leading to flash flooding may develop, but flooding is not imminent.
NWS placed the region under a hazardous weather outlook Wednesday, warning of thunderstorms capable of producing damaging wind gusts, large hail and flash flooding. Tornadoes are also a possibility on Thursday, according to the outlook.
Some weather experts are warning of a "derecho 2," likening this week's storm to a damaging storm featuring straight-line winds that barreled through Maryland last June, knocking out power to much of Montgomery County for days.