

545 

WWUS20 KWNS 151938

SEL6

SPC WW 151938

ILZ000-MOZ000-160300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 306

NWS STORM PREDICTION CENTER NORMAN OK

235 PM CDT FRI MAY 15 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       EAST CENTRAL MISSOURI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

1000 PM CDT.



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

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

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

SCOTT AFB ILLINOIS TO 40 MILES NORTH NORTHEAST OF BLOOMINGTON

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.



OTHER WATCH INFORMATION...CONTINUE...WW 305...



DISCUSSION...AIR MASS CONTINUES TO DESTABILIZE ALONG AND SOUTH OF

SURFACE WARM FRONT BISECTING CENTRAL IL THIS AFTERNOON.  STRONG

PRESSURE FALLS ACROSS NRN IL SUGGESTS THIS WARM FRONT WILL TEND TO

LIFT NWD THROUGH THE EVENING.  VERY STRONG LOW AND DEEP LAYER SHEAR

WILL REMAIN SUPPORTIVE OF SUPERCELLS WITH ATTENDANT TORNADO THREAT.

LARGER SEVERE MCS MAY EVOLVE ACROSS NRN/CENTRAL MO AND MOVE STEADILY

ESEWD TOWARDS E-CENTRAL MO/WRN IL THROUGH THE EVENING...WHICH MAY

SUPPORT INCREASED WIND DAMAGE THREAT.



AVIATION...TORNADOES AND 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 27035.





...EVANS

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