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WWUS20 KWNS 241632

SEL6

SPC WW 241632

CTZ000-DCZ000-DEZ000-MDZ000-NJZ000-NYZ000-PAZ000-VAZ000-WVZ000-CWZ00

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 406

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM EDT THU JUN 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN CONNECTICUT

       DISTRICT OF COLUMBIA

       DELAWARE

       MUCH OF MARYLAND

       NEW JERSEY

       SOUTHEASTERN NEW YORK

       EASTERN PENNSYLVANIA

       NORTHERN AND CENTRAL VIRGINIA

       THE EASTERN WEST VIRGINIA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1230 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 140

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH

SOUTHEAST OF ELKINS WEST VIRGINIA TO 20 MILES NORTH NORTHEAST OF

BLOCK ISLAND RHODE ISLAND.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 404...WW 405...



DISCUSSION...TSTMS EXPECTED TO CONTINUE INCREASING ALONG DIFFUSE

COLD FRONT NOW BISECTING PA.  OTHER STORMS MAY FORM AHEAD OF FRONT

ALONG LEE TROUGH.  STRENGTH OF DEEP UNIDIRECTIONAL WIND FIELD AND

CONTINUED LOW LVL DESTABILIZATION LIKELY WILL LEAD TO INCREASED

POTENTIAL FOR DMGG WIND GUSTS AS STORMS...INCLUDING A FEW

SUPERCELLS...ORGANIZE INTO SHORT LINE/BANDS.



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 24045.





...CORFIDI

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