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WWUS20 KWNS 201635

SEL8

SPC WW 201635

NYZ000-OHZ000-PAZ000-WVZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 708

NWS STORM PREDICTION CENTER NORMAN OK

1235 PM EDT SUN JUL 20 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF WESTERN NEW YORK

       SMALL PART OF EASTERN OHIO

       MUCH OF WESTERN AND NORTHERN PENNSYLVANIA

       SMALL PART OF NORTHERN WEST VIRGINIA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL

800 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 75

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

SOUTHWEST OF YOUNGSTOWN OHIO TO 20 MILES EAST NORTHEAST OF ELMIRA

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...THUNDERER STORMS WILL INCREASE IN NUMBER AND INTENSITY

ACROSS THE WATCH AS HEATING CONTINUES TO DESTABILIZE THE AIR MASS

AND ELIMINATE ANY REMAINING CINH.  WITH 30KT OF DEEP LAYER SHEAR AND

MLCAPES AOA 1500 J/KG...DAMAGING WINDS WILL BE THE PREDOMINATE

THREAT AS STORMS DEVELOP INTO LINE SEGMENTS...SHORT BOWS.



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 26030.





...HALES

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