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July 2013 Obs/Banter/Disco


Avdave

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The models are forecasting the development of an upper low just west of the mountains during the next 24 to 36 hrs. We used to have an old adage, beware of upper lows in summer, there is often a surprise. My guess is someone in VA, Maryland or WV is going to get more rain than they wish over the next 2 days. The scale of the really heavy rain may be small but this is the type of situation that needs to be watched carefully. Already there is slow moving convective cells forming west of dc and there has been flooding in southwest VA

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BULLETIN - EAS ACTIVATION REQUESTED  

FLASH FLOOD WARNING  

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  

1039 PM EDT THU JUL 11 2013  

 

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A  

 

* FLASH FLOOD WARNING FOR...  

NORTHWESTERN PRINCE WILLIAM COUNTY IN NORTHERN VIRGINIA...  

SOUTHEASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA...  

NORTHWESTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA...  

 

* UNTIL 145 AM EDT  

 

* AT 1036 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED  

VERY HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING. RADAR  

ESTIMATES THAT UP TO 2 INCHES OF RAIN HAVE ALREADY FALLEN ACROSS  

PORTIONS OF THE WARNED AREA. ADDITIONAL RAINFALL AMOUNTS OF UP TO 2  

INCHES CAN BE EXPECTED.  

 

* SOME LOCATIONS THAT ARE AFFECTED BY THE HEAVY RAIN INCLUDE  

ARCOLA...BULL RUN...CENTREVILLE...CHANTILLY...COUNTRYSIDE...DULLES  

INTERNATIONAL AIRPORT...GREAT FALLS...HAYMA

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