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371 

WWUS20 KWNS 301945

SEL5

SPC WW 301945

ILZ000-MOZ000-010300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 115

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CDT FRI APR 30 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL ILLINOIS

       EASTERN MISSOURI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

1000 PM 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF

PEORIA ILLINOIS TO 30 MILES SOUTHEAST OF VICHY MISSOURI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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...THIS TORNADO WATCH REPLACES SEVERE

THUNDERSTORM WATCH NUMBER 111. WATCH NUMBER 111 WILL NOT BE IN

EFFECT AFTER 240 PM CDT. CONTINUE...WW 112...WW 113...WW 114...



DISCUSSION...COLD FRONT WAS MOVING THROUGH CENTRAL MO AND WILL AID

IN THUNDERSTORMS DEVELOPING ALONG AND AHEAD OF IT DURING THE NEXT

FEW HOURS. THE AIR MASS HAS BECOME MODERATELY UNSTABLE AHEAD OF THE

FRONT AND THE DEEP LAYER SHEAR WILL BE VERY SUPPORTIVE OF

SUPERCELLS. A MOISTENING BOUNDARY LAYER...WITH DEWPOINTS IN THE MID

60S AND INCREASING LOW LEVEL WINDS/SHEAR WILL FAVOR TORNADOES AND

VERY LARGE HAIL.



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

500. MEAN STORM MOTION VECTOR 23045.





...IMY

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