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764 

WWUS20 KWNS 102217

SEL8

SPC WW 102217

ILZ000-MOZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 138

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT SAT MAY 10 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EXTREME WEST CENTRAL ILLINOIS

  CENTRAL AND NORTHEAST MISSOURI



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 520 PM UNTIL

  1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5

    INCHES IN DIAMETER LIKELY

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST

NORTHWEST OF CHILLICOTHE MISSOURI TO 15 MILES SOUTHEAST OF SAINT

LOUIS MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 137...



DISCUSSION...ONGOING SUPERCELLS ACROSS NW/N CENTRAL MO WILL LIKELY

PERSIST FOR SEVERAL MORE HOURS WHILE MOVING ESEWD ALONG THE SURFACE

WARM FRONT INTO E CENTRAL/NE MO.  LARGE HAIL WILL BE THE PRIMARY

THREAT FOR THE NEXT FEW HOURS...WITH THE RISK FOR DAMAGING WINDS AND

SOME STORM MERGERS/UPSCALE GROWTH INTO A CLUSTER LATER THIS EVENING.

 A TORNADO CANNOT BE RULED OUT...BUT THIS THREAT SHOULD REMAIN

LIMITED BY MARGINAL LOW-LEVEL MOISTURE.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 29025.





...THOMPSON

