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WWUS20 KWNS 261750

SEL3

SPC WW 261750

MDZ000-NYZ000-PAZ000-WVZ000-LOZ000-270100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 213

NWS STORM PREDICTION CENTER NORMAN OK

150 PM EDT TUE APR 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME WESTERN MARYLAND

       MUCH OF UPSTATE NEW YORK

       PENNSYLVANIA

       NORTHERN WEST VIRGINIA

       LAKE ONTARIO



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

900 PM 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHEAST OF UTICA NEW YORK TO 45 MILES SOUTH SOUTHEAST OF

LATROBE PENNSYLVANIA.  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.



DISCUSSION...SEVERAL BANDS OF BROKEN CONVECTION ARE DEVELOPING ALONG

TWO PRIMARY ZONES OF LOW LEVEL CONFLUENCE ACROSS THE OH VALLEY INTO

UPSTATE NY.  THUNDERSTORMS WILL GRADUALLY INTENSIFY AND INCREASE IN

AREAL COVERAGE AS THEY SPREAD/DEVELOP DOWNSTREAM.  LARGE HAIL AND

DAMAGING WINDS ARE EXPECTED WITH THE STRONGEST STORMS.



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 450. MEAN STORM

MOTION VECTOR 22030.





...DARROW

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