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000 

WWUS20 KWNS 032300

SEL9

SPC WW 032300

ILZ000-MOZ000-040700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 439

NWS STORM PREDICTION CENTER NORMAN OK

600 PM CDT TUE JUN 3 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       SMALL PART OF EAST CENTRAL MISSOURI



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 600 PM

UNTIL 200 AM 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 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTHWEST OF QUINCY

ILLINOIS TO 25 MILES SOUTH OF DANVILLE ILLINOIS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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 435...WW 437...WW 438...



DISCUSSION...OUTFLOW BOUNDARY FROM LAST NIGHT/S MCS WAS BEGINNING TO

STRENGTHEN FROM PARTS OF CNTRL/NRN MO EWD INTO CNTRL IL.  AS LARGER

SCALE HEIGHT FALLS BEGIN TO SPREAD EWD FROM THE PLAINS AND THE SSWLY

LLJ STRENGTHENS...THE BOUNDARY WILL TIGHTEN WITH CONVECTION

GRADUALLY DEEPENING THIS EVENING.  ROUGHLY 50 KTS OF 0-6KM SHEAR AND

MAGNITUDE OF MID-TROPOSPHERIC LAPSE RATES IS SUPPORTIVE OF

SUPERCELLS WITH LARGE HAIL.  IN ADDITION...GENTLY BACKING NEAR-SFC

FLOW...LOW LCL ENVIRONMENT AND PRESENCE OF THE BOUNDARY WILL BE

CONDUCIVE FOR TORNADOES WITH ANY SUPERCELL THIS EVENING.

LATER...ACTIVITY WILL MERGE INTO AN MCS WITH DMGG WINDS BECOMING

MORE LIKELY.



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

550. MEAN STORM MOTION VECTOR 28030.





...RACY/THOMPSON

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