A dangerous wave of storms is set to slam the District of Columbia and surrounding parts of Maryland and Virginia on Thursday afternoon, with forecasters warning of torrential downpours, flash flooding and the potential for significant travel disruptions during the evening commute.
The National Weather Service has issued a Flood Watch for the entire D.C. metropolitan area, effective from 2 p.m. Thursday until 2 a.m. Friday. The warning covers D.C., much of central and northern Maryland — including Montgomery, Prince George’s, Anne Arundel and Baltimore counties — and stretches to northern Virginia, affecting Loudoun, Fairfax, Arlington, Alexandria and surrounding communities.
The region is currently blanketed by extreme humidity, with dew points reaching into the upper 70s and precipitable water values exceeding 2 inches.
That tropical moisture will combine with an incoming cold front and a strong upper-level trough to generate numerous slow-moving thunderstorms capable of dumping 1 to 2 inches of rain in under 30 minutes. In isolated cases, rainfall totals could exceed 4 to 6 inches, particularly in urban corridors where runoff is limited.
“Heavy rainfall leading to flash flooding is going to be a major concern,” meteorologists at the National Weather Service in Sterling, Virginia, stated in their latest forecast discussion. “The heaviest rainfall is most likely between 1 p.m. and 6 p.m. west of the Blue Ridge, and 3 p.m. to 8 p.m. to the east. … It is extremely important for those traveling during this evening’s commute to be aware of possible flooding. Do not drive through flooded roadways. Remember — Turn Around, Don’t Drown!”
Forecasters anticipate heat index values will climb between 95 and 105 degrees before the storms hit, creating a volatile atmosphere for storm development.
While the threat of severe thunderstorms appears limited, some storms may still produce damaging wind gusts. However, the main risk remains excessive rainfall, especially in low-lying and poorly drained areas.
Conditions are expected to improve overnight as the front moves southward, though intermittent showers may linger into Friday. High temperatures on Friday will drop significantly, with highs only in the mid-70s and overnight lows dipping into the 50s and low 60s — an unusual break from summer heat for early August.
By the weekend, a high-pressure system will settle over the region, delivering cooler, drier air through Sunday. Highs on Saturday and Sunday are expected to range from the upper 70s to the low 80s, with significantly reduced humidity.
Officials are urging residents to stay informed, monitor weather updates, and avoid unnecessary travel during the peak storm hours.
“Flash flooding caused by excessive rainfall continues to be possible,” the National Weather Service said in its regional advisory. “Flooding may occur in poor drainage and urban areas. Extensive street flooding and flooding of creeks and rivers are possible.”
