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WWUS20 KWNS 241646

SEL4

SPC WW 241646

DEZ000-MDZ000-NJZ000-PAZ000-CWZ000-250000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 544

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM EDT FRI JUN 24 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DELAWARE

       EASTERN MARYLAND

       NEW JERSEY

       EASTERN PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

800 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

NEWARK NEW JERSEY TO 35 MILES SOUTH SOUTHWEST OF DOVER DELAWARE.

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.



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON AHEAD OF COLD FRONT AND ALONG

WARM/STATIONARY BOUNDARY WHERE AIR MASS HAS ALREADY BECOME

MODERATELY UNSTABLE WITH MLCAPE OF 1500-2000 J/KG.  AREA VWPS SHOW

VERTICALLY VEERING WIND PROFILES WITH 35-40 KT OF DEEP-LAYER SHEAR

WHICH WILL SUPPORT ORGANIZED MULTICELL AND SUPERCELL STRUCTURES.

WHILE A BRIEF TORNADO IS POSSIBLE WITH ANY STORMS THAT CAN FAVORABLY

INTERACT WITH WARM FRONT...LARGE HAIL AND DAMAGING WINDS APPEAR TO

BE THE PRIMARY HAZARDS.



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 500. MEAN STORM

MOTION VECTOR 27025.





...MEAD

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