WATCHES: Severe Thunderstorm Watch Number 606

WWUS20 KWNS 260009
SEL6
SPC WW 260009
IAZ000-ILZ000-MOZ000-NEZ000-260700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 606
NWS STORM PREDICTION CENTER NORMAN OK
710 PM CDT WED JUN 25 2008

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

CENTRAL AND SOUTHERN IOWA
WESTERN ILLINOIS
FAR NORTHEAST MISSOURI
EASTERN NEBRASKA

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 710 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF
TEKAMAH NEBRASKA TO 25 MILES SOUTH OF MOLINE ILLINOIS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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 605...

DISCUSSION...TSTMS HAVE BEEN FORMING IN THE PAST 90 MINS NEAR
INTERSECTION OF SLOWLY-MOVING NE/SW COLD FRONT WITH DIFFUSE NW/SE
WARM FRONT IN CNTRL IA. WARM SECTOR IS VERY UNSTABLE...WITH SBCAPE
AOA 3500 J/KG. WHILE REGIONAL WIND FIELD AND LARGE SCALE FORCING
FOR ASCENT WILL REMAIN WEAK...COMBINATION OF STRONG INSTABILITY WITH
MODEST DEEP SHEAR AND LOW-LEVEL ASCENT ALONG FRONTS MAY SUPPORT A
FEW SUSTAINED STORMS/BRIEFLY ROTATING STRUCTURES WITH POTENTIAL FOR
BOTH LARGE HAIL AND HIGH WIND.

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 28020.

...CORFIDI

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