

493 

WWUS20 KWNS 021803

SEL2

SPC WW 021803

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-030000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 322

NWS STORM PREDICTION CENTER NORMAN OK

155 PM EDT TUE JUN 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       EASTERN MARYLAND

       SOUTHERN NEW JERSEY

       SOUTHEASTERN PENNSYLVANIA

       NORTHEASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF

LAKEHURST NEW JERSEY TO 15 MILES WEST SOUTHWEST OF PATUXENT RIVER

MARYLAND.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 321...



DISCUSSION...AN UPPER LEVEL IMPULSE MOVING EWD THROUGH ERN PA WAS

HELPING TO INITIATE STORMS IN SRN PA. THESE STORMS ARE EXPECTED TO

INCREASE IN NUMBER AND INTENSIFY AS THEY MOVE SEWD AT 30-40 MPH.

DEEP LAYER SHEAR AND 30-40 KT MID LEVEL WINDS ARE SUPPORTIVE OF LINE

SEGMENTS/BOWS WITH WIND DAMAGE THE GREATER THREAT. HOWEVER...THE

AMOUNT OF SHEAR COMBINED WITH MODERATE INSTABILITY WILL ALSO SUPPORT

STORMS WITH MID LEVEL ROTATION AND SEVERE HAIL.



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 450. MEAN STORM

MOTION VECTOR 30035.





...IMY

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