Heavy rains are expected tonight, so a Flash Flood Watch is in effect for the Baltimore area starting at 4 p.m.

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The National Weather Service in Sterling Virginia has issued a * Flash Flood Watch for portions of Maryland...the District of Columbia and Virginia...including the following areas...in Maryland...Anne Arundel...central and southeast Howard... central and southeast Montgomery...northwest Howard... northwest Montgomery...Prince Georges and southern Baltimore. The District of Columbia. In Virginia...Arlington/Falls Church/Alexandria...Clarke...Culpeper...eastern Loudoun... Fairfax...Frederick VA...Greene...Madison...northern Fauquier...northern Virginia Blue Ridge...Orange...Page... Prince William/Manassas/Manassas Park...Rappahannock... Rockingham...Shenandoah...southern Fauquier...Warren and western Loudoun.

* From 4 PM EDT this afternoon through late tonight.

Thunderstorms will increase in coverage during the late afternoon and evening hours. There is potential for rainfall rates of one to two inches per hour in addition to repetitive thunderstorms.

* Locally excessive rainfall could cause rapid flooding of small streams as well as low-lying and urban areas.

Precautionary/preparedness actions... 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.