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748 

WWUS20 KWNS 261044

SEL6

SPC WW 261044

KYZ000-OHZ000-261700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 856

NWS STORM PREDICTION CENTER NORMAN OK

645 AM EDT MON SEP 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL KENTUCKY

       SOUTHWEST OHIO



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 645 AM UNTIL 100

PM EDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE

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

CINCINNATI OHIO TO 45 MILES SOUTHWEST OF LONDON KENTUCKY.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...QLCS WITH EMBEDDED MESOCYCLONES HAS RECENTLY

INTENSIFIED PERHAPS IN RESPONSE TO FORCING ASSOCIATED WITH VORTICITY

LOBE ROTATING INTO THE LOWER OH VALLEY.  RECENT SURFACE OBSERVATIONS

WITHIN INFLOW AIR MASS ACROSS CNTRL KY HAVE SHOWN GUSTY SURFACE

WINDS...SUGGESTING SOME COUPLING OF THE BOUNDARY LAYER WITH THE

HIGHER MOMENTUM FLOW ALOFT.  THOUGH INSTABILITY REMAINS

MARGINAL...THE INCREASED FORCING FOR ASCENT COUPLED WITH EFFECTIVE

SRH OF 400-500 M2/S2 SUGGESTS A RISK FOR TORNADOES AND DAMAGING

WINDS WITH THE QLCS.



AVIATION...TORNADOES AND 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

350. MEAN STORM MOTION VECTOR 22045.





...MEAD

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