WATCHES: Severe Thunderstorm Watch Number 231

WWUS20 KWNS 251827
SEL1
SPC WW 251827
IAZ000-ILZ000-MOZ000-260100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 231
NWS STORM PREDICTION CENTER NORMAN OK
130 PM CDT FRI APR 25 2008

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

EASTERN IOWA
WESTERN INTO NORTHERN ILLINOIS
CENTRAL INTO NORTHEASTERN MISSOURI

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 800
PM 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
NORTHWEST OF ROCKFORD ILLINOIS TO 50 MILES EAST OF COLUMBIA
MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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.

DISCUSSION...LINE OF THUNDERSTORMS IS EXPECTED TO INCREASE EARLY
THIS AFTERNOON AND DEVELOP ENEWD ACROSS WW ALONG STRONG SURFACE COLD
FRONT NOW MOVING INTO ERN IA/CENTRAL MO. STRONG ASCENT AND MARGINAL
INSTABILITY SHOULD SUPPORT BROKEN LINE OF STORMS...WITH SUFFICIENT
SHEAR FOR SMALL LINES AND A FEW SUPERCELLS. PRIMARY SEVERE THREAT
WILL BE MARGINAL SEVERE HAIL INITIALLY...ALTHOUGH POTENTIAL FOR
DAMAGING WINDS AND EVEN A BRIEF TORNADO WILL LIKELY INCREASE THROUGH
THE LATE AFTERNOON.

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 400. MEAN STORM
MOTION VECTOR 25035.

...EVANS

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