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929 

WWUS20 KWNS 190901

SEL4

SPC WW 190901

ILZ000-MOZ000-191500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 674

NWS STORM PREDICTION CENTER NORMAN OK

400 AM CDT SUN SEP 19 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       NORTHERN AND EASTERN MISSOURI



EFFECTIVE THIS SUNDAY MORNING FROM 400 AM UNTIL 1000 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST

OF LAMONI IOWA TO 30 MILES SOUTHEAST OF DECATUR ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 673...



DISCUSSION...SCTD ELEVATED TSTMS EXPECTED TO PERSIST IN WAA ZONE

DOWNSTREAM FROM UPR IMPULSE MOVING ESE ACROSS THE LWR MO VLY.

MOISTURE-RICH WSWLY LLJ MAY CONTINUE TO SUPPORT A FEW SUSTAINED

STORMS/MARGINAL SUPERCELLS WITH HAIL AND POSSIBLY LOCALLY DMGG WIND

THROUGH LATER THIS MORNING.  GRADUAL WEAKENING OF LLJ AFTER

SUNRISE...AND EWD MOVEMENT OF THE WIND MAX BEYOND RESERVOIR OF

GREATEST MOISTURE/ INSTABILITY IN WRN MO...SUGGEST THAT THE STORMS

SHOULD DIMINISH AS THEY MOVE/DEVELOP EWD BEYOND CNTRL IL LATER

TODAY.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 29020.





...CORFIDI

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