WATCHES: Severe Thunderstorm Watch Number 163

WWUS20 KWNS 221819
SEL3
SPC WW 221819
IAZ000-ILZ000-MOZ000-WIZ000-230200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 163
NWS STORM PREDICTION CENTER NORMAN OK
120 PM CDT SUN APR 22 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL AND EASTERN IOWA
WESTERN ILLINOIS
NORTHEAST MISSOURI
SOUTHWEST WISCONSIN

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 900
PM 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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST
NORTHEAST OF MASON CITY IOWA TO 15 MILES SOUTH OF QUINCY
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 162...

DISCUSSION...BAND OF SLIGHTLY ELEVATED TSTMS IN CNTRL/N CNTRL MO MAY
INCREASE IN INTENSITY AND BECOME MORE NEARLY SFC-BASED IN THE NEXT
COUPLE OF HOURS AS ACTIVITY ENCOUNTERS HEATED LOW-LEVEL ENVIRONMENT
E OF BAND. WIND FIELD AND LARGE SCALE ASCENT OVER REGION WILL
STRENGTHEN WITH CONTINUED ENE EJECTION OF NEB UPR LOW. OVERALL
SETUP MAY SUPPORT DEVELOPMENT OF DAMAGING WIND GUSTS...HAIL AND
POSSIBLY AN ISOLATED TORNADO WITH EMBEDDED SUSTAINED/SUPERCELL
STORMS.

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 450. MEAN STORM
MOTION VECTOR 22040.

..CORFIDI

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