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WWUS20 KWNS 261629

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SPC WW 261629

NYZ000-VTZ000-270000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 380

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM EDT THU MAY 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST NEW YORK

       NORTHERN AND CENTRAL VERMONT



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

800 PM EDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF

NEWPORT VERMONT TO 50 MILES SOUTH SOUTHWEST OF BURLINGTON

VERMONT.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 379...



DISCUSSION...A SUPERCELL HAS ALREADY EVOLVED EARLY THIS AFTERNOON

OVER NERN NY WITHIN AN KINEMATIC ENVIRONMENT CHARACTERIZED BY 50-55

KT OF EFFECTIVE BULK SHEAR AND 0-1 KM SRH APPROACHING 200 M2/S2 /PER

BURLINGTON VWP/.  INFLOW AIR MASS SHOULD CONTINUE TO

WARM/DESTABILIZE OVER THE NEXT SEVERAL HOURS...SUPPORTING MLCAPE

VALUES OF 1000-2000 J/KG.  THIS COMBINATION OF INSTABILITY AND

VERTICAL SHEAR IS RESULTING IN AN ENVIRONMENT QUITE FAVORABLE FOR

SUPERCELLS CAPABLE OF LARGE HAIL...DAMAGING WINDS AND TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24035.





...MEAD

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