

000 

WWUS20 KWNS 051939

SEL9

SPC WW 051939

CTZ000-MAZ000-MEZ000-NHZ000-NYZ000-RIZ000-VTZ000-060100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 489

NWS STORM PREDICTION CENTER NORMAN OK

335 PM EDT THU JUL 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF CONNECTICUT

       MOST OF MASSACHUSETTS

       SOUTHWEST MAINE

       SOUTHERN AND CENTRAL NEW HAMPSHIRE

       EASTERN AND SOUTHEASTERN NEW YORK

       NORTHERN RHODE ISLAND

       SOUTHERN VERMONT



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 335 PM UNTIL

900 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH OF

MONTICELLO NEW YORK TO 25 MILES EAST NORTHEAST OF PORTSMOUTH NEW

HAMPSHIRE.  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 487...WW 488...



DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO INCREASE IN

COVERAGE AND INTENSITY THIS AFTN IN ZONE OF 30-40 KT DEEP WLY SHEAR

AND SFC HEATING FROM THE LWR MOHAWK AND LWR HUDSON VLYS ENE INTO

CNTRL/SRN NEW ENGLAND.  LOCALLY-BACKED FLOW INVOF THE HUDSON AND CT

RVR VLYS MAY ENHANCE POTENTIAL FOR LOW LVL STORM ROTATION AND

ISOLATED TORNADOES...BUT MAIN SVR THREATS SHOULD BE DAMAGING WINDS

AND HAIL FROM SCTD SUSTAINED SUPERCELLS AND/OR SMALL BOWS IN

MULTICELL BANDS.



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.





...CORFIDI

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