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WWUS20 KWNS 201944

SEL9

SPC WW 201944

MDZ000-PAZ000-WVZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 499

NWS STORM PREDICTION CENTER NORMAN OK

345 PM EDT THU OCT 20 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  MARYLAND PANHANDLE

  WESTERN AND CENTRAL PENNSYLVANIA

  NORTHERN WEST VIRGINIA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

  1100 PM EDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



SUMMARY...SCATTERED THUNDERSTORMS WILL GRADUALLY INCREASE IN

INTENSITY AND SPREAD INTO WESTERN PENNSYLVANIA OVER THE NEXT FEW

HOURS.  DAMAGING WINDS AND LARGE HAIL ARE POSSIBLE WITH THIS

ACTIVITY.  SUPERCELL THREAT IS MORE PRONOUNCED OVER CENTRAL

PENNSYLVANIA LATER THIS EVENING WHERE AN ISOLATED TORNADO CAN NOT BE

RULED OUT.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH

SOUTHWEST OF MORGANTOWN WEST VIRGINIA TO 40 MILES EAST NORTHEAST

OF BRADFORD PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



&&



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 23035.





...DARROW

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