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WWUS20 KWNS 091611

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 450

NWS STORM PREDICTION CENTER NORMAN OK

1205 PM EDT THU JUN 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST CONNECTICUT

       WESTERN MASSACHUSETTS

       MAINE

       NEW HAMPSHIRE

       MUCH OF NEW YORK

       NORTHEAST PENNSYLVANIA

       VERMONT

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1205 PM UNTIL

800 PM EDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 5 MILES EAST

NORTHEAST OF HOULTON MAINE TO 55 MILES SOUTHWEST OF BINGHAMTON

NEW YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...NUMEROUS STORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD

OF A COLD FRONT MOVING EASTWARD INTO THE WATCH AREA. A VERY UNSTABLE

AIR MASS AND DEEP LAYER SHEAR AT 30-40 KT SUGGESTS STORMS WILL BE

SEVERE WITH LARGE HAIL AND DAMAGING WINDS. LARGE HAIL IS MOSTLY

LIKELY EARLIER AS STORMS DEVELOP AND A BRIEF WEAK TORNADO IS ALSO

POSSIBLE.  HOWEVER...DAMAGING WINDS WILL BECOME THE GREATER THREAT

AS THE STORM OUTFLOWS MERGE INTO ONE OR MORE THUNDERSTORM LINES.

DEEP WLY TROPOSPHERIC WINDS AND 40-50 KT MID LEVEL WINDS INDICATE

WIDESPREAD 60-80 MPH WINDS ARE EXPECTED...ONCE THE LINE/S BECOMES

WELL ORGANIZED.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27030.





...IMY

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