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WWUS20 KWNS 080551

SEL8

SPC WW 080551

NYZ000-PAZ000-LEZ000-081100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 438

NWS STORM PREDICTION CENTER NORMAN OK

155 AM EDT WED JUN 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST NEW YORK

       PARTS OF NORTHWEST PENNSYLVANIA

       LAKE ERIE



EFFECTIVE THIS WEDNESDAY MORNING FROM 155 AM UNTIL 700 AM EDT.



HAIL TO 2 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 50

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

NORTHWEST OF FRANKLIN PENNSYLVANIA TO 30 MILES EAST OF JAMESTOWN

NEW YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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.



DISCUSSION...COMPACT BUT INTENSE THUNDERSTORM COMPLEX CONTINUES TO

MOVE SEWD ACROSS SWRN ONTARIO.  WITH STEEP MID LEVEL LAPSE RATES AND

ELEVATED CAPES AOA 2000 J/KG...THE THREAT OF LARGE HAIL/DAMAGING

WINDS EXPECTED TO CROSS ERN LE AND MOVE INTO WATCH AREA.



AVIATION...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 33030.





...HALES

