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858 

WWUS20 KWNS 130352

SEL2

SPC WW 130352

INZ000-KYZ000-MDZ000-OHZ000-PAZ000-WVZ000-LEZ000-131000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 302

NWS STORM PREDICTION CENTER NORMAN OK

1150 PM EDT WED JUN 12 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHEAST INDIANA

  EXTREME NORTHEAST KENTUCKY

  WESTERN MARYLAND

  MUCH OF OHIO

  SOUTHWEST PENNSYLVANIA

  CENTRAL AND NORTHERN WEST VIRGINIA

  LAKE ERIE



* EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1150

  PM UNTIL 600 AM EDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



* PRIMARY THREATS INCLUDE...

  NUMEROUS SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH LIKELY

  SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHEAST OF LATROBE PENNSYLVANIA TO 25 MILES WEST OF DAYTON

OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 300...WW 301...



DISCUSSION...A LARGE BOW ECHO HAS BECOME ESTABLISHED ALONG THE

IND/OH BORDER AND IS RACING EAST-SOUTHEASTWARD AT 45-50 KT.  THIS

SYSTEM MAY RESULT IN A CORRIDOR OF WIDESPREAD SIGNIFICANT WIND

DAMAGE /DERECHO/ ACROSS CENTRAL OH OVER THE NEXT SEVERAL HOURS.

SURROUNDING THE CORRIDOR OF GREATEST RISK...SCATTERED SEVERE STORMS

WILL POSE A RISK OF DAMAGING WINDS AND HAIL THROUGH 10Z.  AN

ISOLATED TORNADO IS ALSO POSSIBLE ALONG THE LEADING EDGE OF THE

BOW...AS WELL AS ASSOCIATED WITH DISCRETE CELLS AHEAD OF THE SYSTEM.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28045.





...HART

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