

000 

WWUS20 KWNS 220759

SEL6

SPC WW 220759

ILZ000-MOZ000-221500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 66

NWS STORM PREDICTION CENTER NORMAN OK

300 AM CDT THU MAR 22 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       PARTS OF EASTERN AND CENTRAL MISSOURI



EFFECTIVE THIS THURSDAY MORNING FROM 300 AM UNTIL 1000 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF COLUMBIA

MISSOURI TO 5 MILES EAST NORTHEAST OF DECATUR ILLINOIS.  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...VERY STRONG SHEAR PROFILES WITH 70KT LLJ COUPLED WITH

ADVECTION OF INCREASINGLY MOIST UNSTABLE AIR MASS HAS ENHANCED

POTENTIAL FOR SUPERCELLS IN BAND OF STORMS ACROSS NRN MO. IN

ADDITION TO DAMAGING WINDS AND LARGE HAIL...TORNADOES ARE ALSO

POSSIBLE WITH THE SUPERCELLS AS THEY TRACK RAPIDLY EWD INTO CENTRAL

IL.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24040.





...HALES

