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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 535

NWS STORM PREDICTION CENTER NORMAN OK

135 PM EDT SAT JUL 28 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST CONNECTICUT

       DISTRICT OF COLUMBIA

       DELAWARE

       CENTRAL AND EASTERN MARYLAND

       NEW JERSEY

       SOUTHEASTERN NEW YORK

       SOUTHERN AND EASTERN PENNSYLVANIA

       NORTHERN AND EASTERN VIRGINIA

       THE EASTERN WEST VIRGINIA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

1000 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

NEWARK NEW JERSEY TO 65 MILES SOUTHWEST OF PATUXENT RIVER

MARYLAND.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SFC HEATING AND CONTINUED ESE ADVANCE OF ERN OH/WRN PA

UPR IMPULSE EXPECTED TO FOSTER A GRADUAL INCREASE IN TSTM COVERAGE

AND  STRENGTH THROUGH EARLY TNGT OVER WW REGION. STORMS MAY BE MOST

CONCENTRATED ALONG AND E OF THE BLUE RIDGE...ALONG DIFFUSE LEE

TROUGH FROM SE PA/CNTRL MD SSW INTO VA...AND NEAR SHALLOW BACK-DOOR

BOUNDARY IN NJ/SE NY.  PREDOMINANT SVR THREAT SHOULD BE LOCALLY DMGG

WIND DUE TO RELATIVELY HIGH PW AND MODERATELY UNIDIRECTIONAL WSWLY

MID LVL FLOW...ESPECIALLY IN AREAS WHERE SFC HEATING WILL CONTINUE

TO OCCUR THROUGH MID AFTN. MARGINALLY SVR HAIL AND...IN NRN PART OF

WW...VERY HEAVY RAIN ALSO MAY OCCUR.  THE STORMS MAY MERGE INTO

SEVERAL LOOSELY ORGANIZED CLUSTERS/BANDS BY MID...WITH A DIMINISHING

SVR THREAT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 25025.





...CORFIDI

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