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000 

WWUS20 KWNS 092149

SEL1

SPC WW 092149

MAZ000-MEZ000-NHZ000-CWZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 501

NWS STORM PREDICTION CENTER NORMAN OK

550 PM EDT MON JUL 9 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MASSACHUSETTS

       SOUTHERN MAINE

       SOUTHERN NEW HAMPSHIRE

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 550 PM UNTIL

1100 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES WEST

SOUTHWEST OF WESTFIELD MASSACHUSETTS TO 10 MILES NORTHEAST OF

LACONIA NEW HAMPSHIRE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 495...WW 496...WW

497...WW 498...WW 499...WW 500...



DISCUSSION...DEEP WLY FLOW WILL FORCE HIGHER INSTABILITY AIRMASS

INTO NEW ENGLAND THIS EVENING AS INCREASING WARM ADVECTION ASSISTS

ONGOING AND NEW THUNDERSTORM DEVELOPMENT.  SCATTERED SEVERE

THUNDERSTORMS SHOULD SPREAD ACROSS MUCH OF NEW ENGLAND TOWARD

COASTAL AREAS THIS EVENING WITH DAMAGING WINDS AND LARGE 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 500. MEAN STORM

MOTION VECTOR 28030.





...DARROW

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