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763 

WWUS20 KWNS 312247

SEL3

SPC WW 312247

ILZ000-MOZ000-010300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 263

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT FRI MAY 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  SOUTHWEST AND WEST CENTRAL ILLINOIS

  EAST CENTRAL MISSOURI



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 545 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH NORTHWEST OF

VICHY MISSOURI TO 25 MILES EAST OF ALTON ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 260...WW 261...WW 262...



DISCUSSION...A MESOSCALE CONVECTIVE SYSTEM NOW DEVELOPING ACROSS

CENTRAL MISSOURI IS EXPECTED TO SPREAD INTO THE ST. LOUIS

METROPOLITAN AREA DURING THE 00-03Z TIME FRAME...ACCOMPANIED BY THE

RISK FOR SEVERE WIND GUSTS...HAIL AND THE RISK FOR A COUPLE OF

TORNADOES.  IT DOES NOT APPEAR OUT OF THE QUESTION THAT ONE OR TWO

DISCRETE SUPERCELLS COULD ALSO FORM IN ADVANCE OF THE PRIMARY

EVOLVING STORM CLUSTER.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24040.





...KERR

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