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WWUS20 KWNS 042301

SEL7

SPC WW 042301

ILZ000-MOZ000-050400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 37

NWS STORM PREDICTION CENTER NORMAN OK

455 PM CST FRI MAR 4 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WEST CENTRAL ILLINOIS

       EAST CENTRAL MISSOURI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 455 PM UNTIL

1000 PM CST.



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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHEAST OF

ALTON ILLINOIS TO 45 MILES WEST SOUTHWEST OF FARMINGTON MISSOURI.

 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 36...



DISCUSSION...ERN MO QLCS WITH EMBEDDED SUPERCELLS EXPECTED TO

CONTINUE MAINLY ENE...WITH SOME SWD DEVELOPMENT POSSIBLE LATER THIS

EVE.  COOL MID LVL TEMPS AND MOISTURE AXIS EXTENDING N UP THE MID MS

VLY ARE  COMPENSATING FOR RELATIVELY MODEST SFC TEMPS TO YIELD

SUFFICIENT INSTABILITY FOR SUSTAINED SFC-BASED STORMS.  AS LOW LVL

WIND FIELD STRENGTHENS THROUGH THE EVE...AND CNTRL MO UPR IMPULSE

CONTINUES ENEWD...POTENTIAL MAY CONTINUE FOR LOW-LVL MESOS WITH A

THREAT FOR ISOLD TORNADOES...IN ADDITION TO SMALL BOWS WITH DMGG

WIND.



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 24035.





...CORFIDI

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