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425 

WWUS20 KWNS 220642

SEL9

SPC WW 220642

MDZ000-OHZ000-PAZ000-VAZ000-WVZ000-221200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 589

NWS STORM PREDICTION CENTER NORMAN OK

130 AM EST SUN DEC 22 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  FAR WESTERN MARYLAND

  EASTERN OHIO

  WESTERN PENNSYLVANIA

  FAR SOUTHWEST VIRGINIA

  MUCH OF WEST VIRGINIA



* EFFECTIVE THIS SUNDAY MORNING FROM 130 AM UNTIL 700 AM EST.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

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

FRANKLIN PENNSYLVANIA TO 50 MILES WEST SOUTHWEST OF BECKLEY WEST

VIRGINIA.  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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 586...WW 587...WW 588...



DISCUSSION...LEWP/BROKEN LINEAR STRUCTURES WITHIN ERN OH SQLN

EXPECTED TO SURGE NE INTO WRN PA/WV LATER THIS MORNING...WITH ISOLD

TO SCTD DMGG WIND POTENTIAL CONTINUING TO BE SUPPORTED BY UNUSUALLY

WARM/HUMID LOW-LVL ENVIRONMENT AND 70+ KT SWLY JET AT 700 MB OVER WW

REGION. WHILE CONVECTIVE BANDS WILL BECOME FARTHER REMOVED FROM

ASSOCIATED UPR LVL VORT MAX WITH TIME...PRESENCE OF EXISTING

WELL-ORGANIZED UPDRAFTS AND UPSLOPE COMPONENT TO FLOW ALONG THE WRN

SLOPES OF THE APPALACHIANS FURTHER SUGGEST A CONTINUING RISK FOR

LOCALLY DMGG WIND.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300. MEAN STORM

MOTION VECTOR 25050.





...CORFIDI

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