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647 

WWUS20 KWNS 261729

SEL2

SPC WW 261729

ILZ000-INZ000-KYZ000-MOZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 372

NWS STORM PREDICTION CENTER NORMAN OK

125 PM EDT WED JUN 26 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN ILLINOIS

  SOUTHERN INDIANA

  WESTERN AND CENTRAL KENTUCKY

  SOUTHEAST MISSOURI MISSOURI



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 125 PM

  UNTIL 1100 PM EDT.



* PRIMARY THREATS INCLUDE...

  NUMEROUS DAMAGING WIND GUSTS TO 70 MPH LIKELY

  SEVERAL LARGE HAIL EVENTS 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 105

STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTHWEST OF

MOUNT VERNON ILLINOIS TO 45 MILES EAST SOUTHEAST OF LOUISVILLE

KENTUCKY.  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.



&&



DISCUSSION...A PERSISTENT CLUSTER OF THUNDERSTORMS NOW SPREADING

INTO SOUTHERN INDIANA APPEARS LIKELY TO INTENSIFY DURING THE NEXT

FEW HOURS...AS IT BECOMES INCREASINGLY ROOTED IN A MOIST BOUNDARY

LAYER AIR MASS CHARACTERIZED BY LARGE CAPE.  SUPPORTED BY MID-LEVEL

FORCING ASSOCIATED WITH A WEAK MID-LEVEL IMPULSE...AND LOWER/MID

TROPOSPHERIC WARM ADVECTION TO ITS SOUTH AND WEST...THE GRADUAL

UPSCALE GROWTH OF A LARGE MESOSCALE CONVECTIVE SYSTEM APPEAR

POSSIBLE THIS AFTERNOON.  AS ASSOCIATED COLD POOLS CONSOLIDATE AND

DEEPEN...MODEST WESTERLY DEEP LAYER MEAN FLOW WILL AID EAST

SOUTHEASTWARD PROPAGATION...ACCOMPANIED BY AN INCREASING RISK FOR

POTENTIALLY DAMAGING WIND GUSTS.



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 600. MEAN STORM

MOTION VECTOR 27030.





...KERR

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