

390 

WWUS20 KWNS 240527

SEL3

SPC WW 240527

NYZ000-PAZ000-LEZ000-241000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 403

NWS STORM PREDICTION CENTER NORMAN OK

130 AM EDT THU JUN 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN NEW YORK

       PARTS OF NORTHWEST PENNSYLVANIA

       LAKE ERIE



EFFECTIVE THIS THURSDAY MORNING FROM 130 AM UNTIL 600 AM EDT.



HAIL TO 1 INCH 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF

JAMESTOWN NEW YORK TO 25 MILES EAST NORTHEAST OF ELMIRA NEW YORK.

 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 402...



DISCUSSION...LINE OF SVR TSTMS HAS DEVELOPED OVER LE.  WITH 40-50KT

OF WLY FLOW JUST OFF SURFACE ALONG WITH A MOIST/MODESTLY UNSTABLE

AND MIXED AIR MASS WILL SUPPORT A WIND DAMAGE THREAT AS THESE STORMS

MOVE RAPIDLY EWD ACROSS THE WATCH.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 27045.





...HALES

