

040 

WWUS20 KWNS 262322

SEL2

SPC WW 262322

ILZ000-MOZ000-270600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 32

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CST THU FEB 26 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ILLINOIS

       CENTRAL AND SOUTHERN MISSOURI



EFFECTIVE THIS THURSDAY AFTERNOON FROM 520 PM UNTIL MIDNIGHT CST.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTH

NORTHWEST OF ALTON ILLINOIS TO 35 MILES SOUTHEAST OF MONETT

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...TSTMS EXPECTED TO INCREASE IN COVERAGE AND POSSIBLY

INTENSITY DURING THE NEXT FEW HOURS AS MID LVL COOLING ASCENT

OVERTAKE MERGING COLD FRONTS NOW IN WRN MO/SE KS.  WIND PROFILES

WILL BE FAVORABLE FOR SUPERCELLS WITH SVR HAIL/WIND AND POSSIBLY A

TORNADO.  BUT BOUNDARY LAYER MOISTURE IS SOMEWHAT MARGINAL...AND

INCREASED LINEAR FORCING WITH TIME SUGGESTS OVERALL EVOLUTION TO A

QUASI-LINEAR STORM MODE.

SRN PART OF WW...IN PARTICULAR...WILL BE MONITORED FOR SIGNS OF A

MORE DELAYED EVOLUTION TO LINEAR MODE...AND POSSIBLE UPGRADE TO

TORNADO WW.



AVIATION...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 400. MEAN STORM

MOTION VECTOR 27045.





...CORFIDI

