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WWUS20 KWNS 251529

SEL4

SPC WW 251529

DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-WVZ000-CWZ000-252300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 534

NWS STORM PREDICTION CENTER NORMAN OK

1130 AM EDT SUN JUL 25 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN DELAWARE

       NORTHERN MARYLAND

       NEW JERSEY

       LARGE PART OF SOUTHERN PENNSYLVANIA

       PARTS OF NORTHERN VIRGINIA

       PARTS OF EASTERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1130 AM UNTIL 700

PM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST

SOUTHWEST OF MORGANTOWN WEST VIRGINIA TO 25 MILES NORTHEAST OF

LAKEHURST NEW JERSEY.  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...THUNDERSTORMS EXPECTED TO INCREASE EWD ACROSS THE WATCH

AS THE AIR MASS HAS BECOME MDTLY UNSTABLE WITH MLCAPES OF 2000 J/KG

OR GREATER. WITH 35-40 KT OF MID LEVEL FLOW AND STEEP LOW LEVEL

LAPSE RATES...DAMAGING WINDS WILL BE THE PRIMARY THREAT.  STORMS

SHOULD EVOLVE INTO SHORT LINE SEGMENTS/BOWS ENHANCING THE WIND

DAMAGE POTENTIAL.



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 27040.





...HALES

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