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WWUS20 KWNS 011832

SEL1

SPC WW 011832

CTZ000-MAZ000-NHZ000-NYZ000-RIZ000-CWZ000-020200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 711

NWS STORM PREDICTION CENTER NORMAN OK

235 PM EDT MON AUG 1 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CONNECTICUT

       MASSACHUSETTS

       SOUTHERN NEW HAMPSHIRE

       FAR SOUTHEAST NEW YORK

       RHODE ISLAND

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

1000 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF

WORCESTER MASSACHUSETTS TO 10 MILES SOUTH SOUTHWEST OF GROTON

CONNECTICUT.  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 709...WW 710...



DISCUSSION...MULTIPLE CLUSTERS OF TSTMS ARE ONGOING WITHIN A HOT AND

VERY MOIST AIR MASS WITH MLCAPE UPWARDS OF 2000-3000 J/KG.  THOUGH

VERTICAL SHEAR REMAINS RELATIVELY WEAK...THE PRESENCE OF MODESTLY

STEEP MIDLEVEL LAPSE RATES AND MODERATE/STRONG INSTABILITY WILL

SUPPORT A RISK FOR LARGE HAIL AND DAMAGING WINDS INTO THIS EVENING.



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 33020.





...MEAD

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