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WWUS20 KWNS 050903

SEL4

SPC WW 050903

MDZ000-NJZ000-PAZ000-CWZ000-051400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 104

NWS STORM PREDICTION CENTER NORMAN OK

505 AM EDT TUE APR 5 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN MARYLAND

       NEW JERSEY

       SOUTHEAST PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING FROM 505 AM UNTIL 1000 AM EDT.



HAIL TO 0.5 INCH 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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF NEWARK NEW JERSEY TO 15 MILES SOUTHWEST OF

PHILADELPHIA PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 100...WW 101...WW

102...WW 103...



DISCUSSION...STRONGLY FORCED BAND OF TSTMS IS EXPECTED TO CONTINUE

DEVELOPING NWD THROUGH THE DE RIVER VALLEY THIS MORNING WITHIN A

DESTABILIZING BOUNDARY LAYER.  GIVEN THE VERY STRONG SHEAR IN

PLACE...THE POTENTIAL WILL EXIST FOR DAMAGING WINDS WITH ANY

EMBEDDED BOWING/LEWP STRUCTURES.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27050.





...MEAD

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