

846 

WWUS20 KWNS 270735

SEL7

SPC WW 270735

ILZ000-MOZ000-271500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 957

NWS STORM PREDICTION CENTER NORMAN OK

135 AM CST SAT DEC 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       NORTHEAST MISSOURI



EFFECTIVE THIS SATURDAY MORNING FROM 135 AM UNTIL 900 AM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF BLOOMINGTON

ILLINOIS TO 60 MILES SOUTH SOUTHEAST OF QUINCY 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 955...WW 956...



DISCUSSION...SCTD CLUSTERS/SHORT BANDS OF SUSTAINED TSTMS EXPECTED

TO PERSIST IN WAA AREA ALONG AXIS OF 60 KT SSWLY LLJ.  GRADUAL LOW

LVL MOISTENING ACROSS REGION...AND CONTINUED EROSION OF SHALLOW LOW

LVL STABLE LAYER...MAY SUPPORT A THREAT FOR ISOLD TORNADOES...IN

ADDITION TO SCTD DMGG WIND GUSTS...WITH EMBEDDED SUPERCELLS LIKELY

TO DEVELOP/EXIST THROUGH MID MORNING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 23045.





...CORFIDI

