WATCHES: Severe Thunderstorm Watch Number 674

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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