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362 

WWUS20 KWNS 172252

SEL4

SPC WW 172252

NYZ000-OHZ000-PAZ000-LEZ000-LOZ000-180400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 314

NWS STORM PREDICTION CENTER NORMAN OK

655 PM EDT TUE JUN 17 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL NEW YORK

  EXTREME NORTHEAST OHIO

  EXTREME NORTHWEST AND NORTH CENTRAL PENNSYLVANIA

  LAKE ERIE

  LAKE ONTARIO



* EFFECTIVE THIS TUESDAY NIGHT FROM 655 PM UNTIL MIDNIGHT EDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHEAST OF

ROCHESTER NEW YORK TO 15 MILES SOUTH SOUTHWEST OF BRADFORD

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 311...WW 313...



DISCUSSION...BANDS OF THUNDERSTORMS WILL SPREAD ESEWD FROM ONTARIO

AND THE LOWER GREAT LAKES INTO WRN/CENTRAL NW AND NW/N CENTRAL

PA...IN ADVANCE OF A PRONOUNCED MIDLEVEL SHORTWAVE TROUGH CROSSING

SW ONTARIO.  THE COMBINATION OF MODERATE INSTABILITY AND EFFECTIVE

BULK SHEAR NEAR 40 KT WILL SUPPORT A RISK FOR ORGANIZED CELLS/LINE

SEGMENTS CAPABLE OF PRODUCING DAMAGING WINDS AND ISOLATED LARGE HAIL

INTO THE EARLY OVERNIGHT HOURS.



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 29035.





...THOMPSON

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