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WWUS20 KWNS 251048

SEL7

SPC WW 251048

ILZ000-MOZ000-251800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 367

NWS STORM PREDICTION CENTER NORMAN OK

545 AM CDT WED MAY 25 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN ILLINOIS

       FAR SOUTHEAST MISSOURI



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 545 AM UNTIL

100 PM CDT.



TORNADOES...HAIL TO 1.5 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 EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF

MARSEILLES ILLINOIS TO 5 MILES EAST SOUTHEAST OF CARBONDALE

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 366...



DISCUSSION...A BROKEN QUASI-LINEAR CONVECTIVE SYSTEM WILL CONTINUE

TO STEADILY ADVANCE NORTHEASTWARD THIS MORNING ACROSS A LARGE PART

OF CENTRAL AND EASTERN IL. A RELATIVELY WARM/MOIST MORNING AIRMASS

WILL CONTINUE TO DESTABILIZE WITH ADDITIONAL HEATING AFTER

SUNRISE...WHILE AN INCREASINGLY STRONG DEEP LAYER WIND FIELD WILL

SUPPORT ORGANIZED/FAST MOVING QUASI-LINEAR STRUCTURES CAPABLE OF

DAMAGING WINDS AND ISOLATED TORNADOES.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 22045.





...GUYER/CORFIDI

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