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Flash flood watches and warnings for Baltimore and Washington this afternoon

Flash flood watches and warnings for Baltimore and Washington this afternoon:

Heavy rain has been falling since mid-morning in Baltimore and Washington, prompting the National Weather Service to issue flash flood watches and warnings. The watch is in effect until 2 a.m. on Wednesday. Some locations have already received in excess of 3 inches of rain with isolated spots receiving up to 6 inches of rainfall. Here is the text of the current warning:

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
324 PM EDT TUE AUG 12 2014

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
SOUTHEASTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND...
SOUTHEASTERN HOWARD COUNTY IN CENTRAL MARYLAND...
SOUTHERN BALTIMORE COUNTY IN NORTHERN MARYLAND...
NORTH CENTRAL PRINCE GEORGES COUNTY IN CENTRAL MARYLAND...
NORTHWESTERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...
BALTIMORE CITY IN NORTHERN MARYLAND...

* UNTIL 645 PM EDT

* AT 322 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THE HEAVIEST RAIN HAD MOVED EAST...BUT STILL MODERATE TO
OCCASIONALLY HEAVY RAIN WAS FALLING ACROSS HOWARD COUNTY INTO
BALTIMORE CITY. THE REMAINING TORRENTIAL RAIN WILL AFFECT PORTIONS
OF BALTIMORE CITY AND SOUTHEASTERN BALTIMORE COUNTY. 4 TO 6 INCHES
OF RAIN HAS BEEN REPORTED...MAINLY FROM EAST OF COLUMBIA TO BWI
AIRPORT TO ESSEX. ADDITIONAL RAINFALL AMOUNTS OF UP TO 1 INCH
CAN BE EXPECTED...EXCEPT IN PORTIONS OF BALTIMORE CITY AND
SOUTHEASTERN BALTIMORE COUNTY...WHERE UP TO THREE INCHES IS LIKELY.

* SOME LOCATIONS THAT ARE AFFECTED BY THE HEAVY RAIN INCLUDE BWI
AIRPORT...ADELPHI...ARBUTUS...BELTSVILLE...BLADENSBURG...BOWLEYS
QUARTERS...BROOKLYN PARK...CATONSVILLE...CHEVERLY...COLLEGE PARK...
COLUMBIA...DUNDALK...ELKRIDGE...ELLICOTT CITY...ESSEX...FELLS
POINT...FERNDALE...FORT MEADE...GLEN BURNIE...GREENBELT...
HYATTSVILLE...LANDOVER...LANGLEY PARK...LAUREL...LOCHEARN...MIDDLE
RIVER...NEW CARROLLTON...ODENTON...PUMPHREY...ROSEDALE...
ROSSVILLE...SEVERN...SOUTH GATE...TAKOMA PARK...WHITE MARSH...
WOODLAWN...AND BALTIMORE.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. FLOODWATER USUALLY IS
DEEPER THAN IT APPEARS. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. MAKE THE SMART CHOICE WHEN
FLOODED ROADS ARE ENCOUNTERED...TURN AROUND...DONT DROWN.

Here is the text of the current watch:

FLOOD WATCH
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1154 AM EDT TUE AUG 12 2014

DCZ001-MDZ005>007-009>011-013-014-016-VAZ052>057-130000-
/O.NEW.KLWX.FF.A.0009.140812T1600Z-140813T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DISTRICT OF COLUMBIA-CARROLL-NORTHERN BALTIMORE-HARFORD-
MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-
CHARLES-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-
INCLUDING THE CITIES OF...WASHINGTON...WESTMINSTER...
GAITHERSBURG...COLUMBIA...BALTIMORE...ANNAPOLIS...WALDORF...
MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...FALLS CHURCH...
FREDERICKSBURG
1154 AM EDT TUE AUG 12 2014

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

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...CARROLL...CHARLES...HARFORD...
HOWARD...MONTGOMERY...NORTHERN BALTIMORE...PRINCE GEORGES AND
SOUTHERN BALTIMORE. THE DISTRICT OF COLUMBIA. IN VIRGINIA...
ARLINGTON/FALLS CHURCH/ALEXANDRIA...FAIRFAX...KING GEORGE...
PRINCE WILLIAM/MANASSAS/MANASSAS PARK...SPOTSYLVANIA AND
STAFFORD.

* THROUGH LATE TONIGHT

* SHOWERS...WITH EMBEDDED AREAS OF HEAVY RAINFALL...WILL CONTINUE
THROUGH TONIGHT. ALTHOUGH IT WONT BE RAINING ALL THE TIME...
PERIODS OF HEAVY RAIN WILL LEAVE THE GOUND WATER CLOGGED...
RESULTING IN POTENTIAL FLOODING.

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.

Weather Summary

A frontal passage to our west continues to move eastward this afternoon. The clash of the front with warm, humid air in place over the Middle Atlantic states is resulting in widespread showers and thunderstorms across Baltimore and Washington this afternoon. Flash flood watches and warnings have been posted for local flooding due to very heavy rain that has been falling for several hours during the late morning and early afternoon hours. Showers and embedded thunderstorms will continue through the afternoon and into the evening before tapering to light, scattered showers overnight. Wednesday may begin with considerable cloudiness, but the sky will begin to clear from west to east as the front pushes to our east. A mostly sunny sky is expected by afternoon with highs around 80. High pressure will build over the region on Thursday and Friday with plenty of bright sunshine and comfortable levels of humidity. Highs each day will be in the upper 70s to lower 80s with overnight lows in the upper 50s to lower 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.