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Flash Flood Watch for Baltimore and Washington

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The National Weather Service has issued a Flash Flood Watch for Baltimore and Washington effective this afternoon through Friday. Here is the official statement from the National Weather Service in Sterling, VA:

FLASH FLOOD WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH

FRIDAY AFTERNOON...

THE FLASH FLOOD WATCH CONTINUES FOR

* PORTIONS OF CENTRAL MARYLAND...NORTHERN MARYLAND AND SOUTHERN

MARYLAND...INCLUDING THE FOLLOWING AREAS...IN CENTRAL

MARYLAND...ANNE ARUNDEL AND PRINCE GEORGES. IN NORTHERN

MARYLAND...HARFORD...NORTHERN BALTIMORE AND SOUTHERN

BALTIMORE. IN SOUTHERN MARYLAND...CHARLES.

* FROM LATE TONIGHT THROUGH FRIDAY AFTERNOON

* SHOWERS AND SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS

EVENING AND CONTINUE INTO FRIDAY AFTERNOON. THE HEAVIEST RAIN

WILL BE LATE TONIGHT THROUGH MIDDAY FRIDAY. RAINFALL AMOUNTS OF

2 TO 3 INCHES ARE EXPECTED...WITH LOCALLY HIGHER AMOUNTS

POSSIBLE. THIS AMOUNT OF RAINFALL HAS THE POTENTIAL TO PRODUCE

FLASH FLOODING...ESPECIALLY IN URBAN AREAS AND ALONG SMALL

RIVERS AND STREAMS.

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.

Here is the weather summary:

A warm, humid flow of air will set the stage for heavy rainfall in Baltimore and Washington tonight through Friday afternoon. Temperatures this afternoon are in the lower 80s. Meanwhile, a cold front will cross the mountains during the afternoon and evening hours. As the front clashes with the warm, humid air in place over central Maryland, widespread rain showers and thundershowers will develop. 1 to 2 inches of rainfall can be expected, but isolated locations may receive 3 to 4 inches of rainfall by Friday afternoon. Areal flooding may occur due to the heavy rain falling over a short period. The cold front will continue to move from west to east across Chesapeake Bay on Friday. Widespread showers and thundershowers will continue across the region with heavy rain possible in some areas. Showers with isolated thundershowers may persist into the evening hours on Friday before drier and cooler air moves in from the west. Saturday will begin with some residual cloudiness, but sunshine will return for the balance of the day. It will be breezy at times on Saturday with afternoon highs reaching the upper 60s to lower 70s. Sunday will start off on the cool side with readings in the upper 40s to lower 50s, but a sunny afternoon can be expected with highs in the upper 60s.

Regional Weather Information

Baltimore average lows and highs

Washington average lows and highs

National Weather Service daily weather discussion

Baltimore/Washington National Weather Service

Chesapeake Bay marine forecast

Mid-Atlantic radar loop

For more weather updates, please visit my web site www.chesapeakebayweather.com, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.

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