

000 

WWUS20 KWNS 300014

SEL5

SPC WW 300014

CTZ000-MAZ000-NJZ000-NYZ000-PAZ000-VTZ000-CWZ000-300700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 645

NWS STORM PREDICTION CENTER NORMAN OK

810 PM EDT SUN JUN 29 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN CONNECTICUT

       WESTERN MASSACHUSETTS

       CENTRAL AND NORTHERN NEW JERSEY

       CENTRAL AND EASTERN NEW YORK

       CENTRAL AND EASTERN PENNSYLVANIA

       VERMONT

       COASTAL WATERS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 810 PM UNTIL

300 AM 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 105

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

BURLINGTON VERMONT TO 35 MILES SOUTH SOUTHEAST OF HARRISBURG

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 642. WATCH NUMBER 642 WILL NOT

BE IN EFFECT AFTER 810 PM EDT. CONTINUE...WW 640...WW 641...WW

643...WW 644...



DISCUSSION...SCTD TSTMS...INCLUDING A FEW SUSTAINED STORMS/POSSIBLE

BOWING SEGMENTS...EXPECTED TO PERSIST ACROSS WW THROUGH LATE

TONIGHT.  MID/UPR LVL WINDS ACROSS REGION...AND LARGE SCALE

ASCENT...WILL SLOWLY INCREASE AS JET STREAK NOW OVER THE CNTRL

APLCNS DEVELOPS FARTHER NEWD.  LOW TO MID LVL LAPSE RATES WILL BE

WEAK.  BUT PRESENCE OF HIGH PWS WITH STRENGTHENING WIND FIELD/ASCENT

SUGGESTS A THREAT FOR LOCALLY DMGG WIND AND PERHAPS AN ISOLD TORNADO

THROUGH EARLY MONDAY.



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 24035.





...CORFIDI

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