

564 

WWUS20 KWNS 142302

SEL6

SPC WW 142302

NYZ000-PAZ000-WVZ000-LEZ000-LOZ000-150500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 156

NWS STORM PREDICTION CENTER NORMAN OK

705 PM EDT WED MAY 14 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EXTREME WESTERN NEW YORK

  WESTERN PENNSYLVANIA

  NORTHERN WEST VIRGINIA

  LAKE ERIE

  LAKE ONTARIO



* EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 705 PM

  UNTIL 100 AM EDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST

SOUTHWEST OF MORGANTOWN WEST VIRGINIA TO 30 MILES NORTH NORTHWEST

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

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 153...WW 154...WW 155...



DISCUSSION...SPORADIC SVR TSTMS ARE EXPECTED TO MOVE NEWD TO NNEWD

ACROSS WW AREA IN NARROW CORRIDOR OF FAVORABLE WARM-SECTOR/BOUNDARY

LAYER AIR...LOCATED W OF FRONTAL ZONE LOCATED OVER WRN PA.  MAIN

CONCERNS WILL BE HAIL AND DAMAGING GUSTS...AMIDST 30-40 KT

EFFECTIVE-SHEAR MAGNITUDE AND 500-1000 J/KG INITIAL MLCAPE...LATTER

DECREASING GRADUALLY WITH TIME THIS EVENING.



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 23035.





...EDWARDS

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