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WWUS20 KWNS 290835

SEL4

SPC WW 290835

DEZ000-MDZ000-NJZ000-PAZ000-CWZ000-291200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 434

NWS STORM PREDICTION CENTER NORMAN OK

435 AM EDT FRI JUN 29 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DELAWARE

       EASTERN MARYLAND

       CENTRAL AND SOUTHERN NEW JERSEY

       FAR SOUTHEAST PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY MORNING FROM 435 AM UNTIL 800 AM EDT.



HAIL TO 1 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHEAST OF TRENTON NEW JERSEY TO 40 MILES SOUTH SOUTHWEST OF

WILMINGTON 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...BOWING MCS WITH A HISTORY OF WIND DAMAGE WILL PROGRESS

ACROSS WATCH AREA EARLY THIS MORNING AT 40-45 KT.  AMBIENT AIR MASS

IS CHARACTERIZED BY STEEP MIDLEVEL LAPSE RATES AND A RATHER STRONG

UNIDIRECTIONAL WIND FIELD WITH 50-60 KT WINDS OBSERVED IN THE 2-6 KM

AGL LAYER BY THE STATE COLLEGE PA VAD.  DAMAGING WINDS WILL BE THE

PRIMARY HAZARD THOUGH SOME HAIL IS ALSO POSSIBLE.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 29040.





...MEAD

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