

000 

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

