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WWUS20 KWNS 082047

SEL9

SPC WW 082047

CTZ000-MAZ000-MEZ000-NHZ000-RIZ000-CWZ000-090300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 639

NWS STORM PREDICTION CENTER NORMAN OK

450 PM EDT SAT SEP 8 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CONNECTICUT

       MASSACHUSETTS

       SOUTHWEST MAINE

       NEW HAMPSHIRE

       RHODE ISLAND

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 450 PM UNTIL

1100 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 EAST AND WEST OF A LINE FROM 100 MILES NORTH

NORTHEAST OF BERLIN NEW HAMPSHIRE TO 20 MILES SOUTH SOUTHEAST OF

WINDSOR LOCKS CONNECTICUT.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 635...WW 636...WW

637...WW 638...



DISCUSSION...COLD FRONTAL SQUALL LINE OVER ERN NY WILL CONTINUE TO

MOVE EWD AND IMPACT THE WATCH AREA THROUGH LATE EVENING.  THOUGH

INSTABILITY IS NOT AS LARGE COMPARED TO AREAS FARTHER TO THE W...THE

STORM ENVIRONMENT SHOULD REMAIN SUFFICIENT TO MAINTAIN A RISK FOR

DAMAGING WINDS FOR THE NEXT FEW HOURS.



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 400. MEAN STORM MOTION

VECTOR 25030.





...THOMPSON

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