https://www.weather.gov/wwamap/wwatxtget.php?cwa=lwx&wwa=all
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...FLOOD WATCH REMAINS IN EFFECT FROM THURSDAY AFTERNOON THROUGH
LATE THURSDAY NIGHT...
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...The District of Columbia, portions of Maryland, including
the following areas, Anne Arundel, Calvert, Carroll, Cecil,
Central and Southeast Howard, Central and Southeast Montgomery,
Charles, Frederick MD, Northern Baltimore, Northwest Harford,
Northwest Howard, Northwest Montgomery, Prince Georges, Southeast
Harford, Southern Baltimore and St. Marys, and northern Virginia,
including the following areas, Arlington/Falls Church/Alexandria,
Central and Southeast Prince William/Manassas/Manassas Park,
Eastern Loudoun, Fairfax, Northern Fauquier, Northwest Prince
William, Southern Fauquier and Western Loudoun.
* WHEN...From Thursday afternoon through late Thursday night.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Extensive
street flooding and flooding of creeks and rivers are possible.
* ADDITIONAL DETAILS...
- Significant flash flooding is possible. Numerous showers and
thunderstorms will develop and move across the area Thursday
afternoon into Thursday evening. Thunderstorms will be
capable of producing very heavy rain, with rainfall rates of
1 to 2 inches in 30 minutes. Widespread rainfall amounts of 1
to 2 inches are expected. Some areas could experience
multiple rounds of thunderstorms, with higher rainfall
amounts of 4 to 6 inches possible. This could result in
numerous instances of flash flooding. Showers and
thunderstorms will begin early Thursday afternoon, and the
heaviest rainfall is most likely from 3 PM to 8 PM.
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