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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 463

NWS STORM PREDICTION CENTER NORMAN OK

610 PM EDT WED JUL 4 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN MAINE

       CENTRAL AND SOUTHERN NEW HAMPSHIRE

       NORTHEAST NEW YORK

       WESTERN AND CENTRAL VERMONT

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT FROM 610 PM UNTIL MIDNIGHT 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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF

BURLINGTON VERMONT TO 25 MILES SOUTH SOUTHWEST OF PORTSMOUTH NEW

HAMPSHIRE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 460...WW 461...WW 462...



DISCUSSION...TSTMS...INCLUDING POSSIBLE SUSTAINED

STORMS/SUPERCELLS...EXPECTED TO CONTINUE FORMING IN NW-SE CORRIDOR

OF LOW LVL WAA/MOISTURE TRANSPORT AHEAD OF FAIRLY POTENT SRN QUEBEC

SHORTWAVE TROUGH.  COMBINATION OF SFC HEATING...AMPLY RICH LOW LVL

MOISTURE...AND 35-40 KT NWLY DEEP SHEAR MAY PROVE SUFFICIENT FOR

STORMS WITH SMALL BOWS/DMGG WIND...AND PERHAPS SVR HAIL...GIVEN

PRESENCE OF MODERATE LARGE SCALE FORCING FOR ASCENT.



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 32025.





...CORFIDI

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