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448 

WWUS20 KWNS 300051

SEL9

SPC WW 300051

NYZ000-LEZ000-LOZ000-300500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 399

NWS STORM PREDICTION CENTER NORMAN OK

855 PM EDT SUN MAY 29 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF WESTERN NEW YORK

       LAKE ERIE

       LAKE ONTARIO



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 855 PM UNTIL

100 AM 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 NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST

OF BUFFALO NEW YORK TO 15 MILES NORTHEAST OF ITHACA NEW YORK.

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 396...WW 397...WW 398...



DISCUSSION...MATURE MCS WITH A LEADING SQUALL LINE CONTINUES EWD

ACROSS SRN ONTARIO/LE.  GIVEN THE MDT INSTABILITY AND 40KT OF BRN

SHEAR OFF BUF 00Z SOUNDING...THE THREAT OF DAMAGING WINDS AND SOME

HAIL WILL PERSISTS FOR SEVERAL MORE HOURS EWD ACROSS WRN NY.



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 27040.





...HALES

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