WATCHES: Severe Thunderstorm Watch Number 224

WWUS20 KWNS 020222
SEL4
SPC WW 020222
IAZ000-MNZ000-NEZ000-020600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 224
NWS STORM PREDICTION CENTER NORMAN OK
915 PM CDT TUE MAY 1 2012

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

NORTHERN AND WESTERN IOWA
A SMALL PART OF SOUTHERN MINNESOTA
EASTERN NEBRASKA

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 915 PM
UNTIL 200 AM CDT.

HAIL TO 2 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST
NORTHEAST OF SPENCER IOWA TO 35 MILES SOUTHWEST OF LINCOLN
NEBRASKA. 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...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 220...SEVERE THUNDERSTORM WATCH NUMBER 221.
WATCH NUMBER 220 221 WILL NOT BE IN EFFECT AFTER 915 PM CDT.
CONTINUE...WW 222...WW 223...

DISCUSSION...SCTD TSTMS EXPECTED TO DEVELOP OVER ERN NEB IN ZONE OF
STRENGTHENING LOW LVL WAA/MOISTURE INFLOW E AND S OF PRE-COLD
FRONTAL CONFLUENCE AXIS. FARTHER N...STORMS EXPECTED TO CONTINUE
FORMING ALONG CONSOLIDATING OUTFLOW LEFT BY EARLIER STORMS IN SRN
MN/SE SD. STRENGTHENING/SLIGHTLY VEERING LLJ AND ARRIVAL OF RATHER
MOIST AIR /PW AOA 1 INCH/ FROM KS SUGGESTS POTENTIAL FOR FEW
SUPERCELLS WITH LARGE HAIL...LOCALLY DMGG WIND...AND POSSIBLY A
TORNADO. ACTIVITY IN NRN IA MAY CONSOLIDATE INTO A LARGER SCALE BOW
AND CONTINUE E/ESE ACROSS NRN IA WITH SPORADIC DMGG
WIND...HAIL...AND PERHAPS A BRIEF TORNADO.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 26030.


...CORFIDI

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