Severe Thunderstorm Watch 712

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 712
NWS STORM PREDICTION CENTER NORMAN OK
900 PM CDT SUN JUL 20 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN IOWA
CENTRAL AND EASTERN NEBRASKA
FAR SOUTHERN SOUTH DAKOTA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 900 PM UNTIL
400 AM CDT.
HAIL TO 3 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 NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH
NORTHWEST OF BURWELL NEBRASKA TO 20 MILES EAST SOUTHEAST OF
DENISON IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
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...SEVERE THUNDERSTORMS WILL BECOME INCREASINGLY
WIDESPREAD ACROSS WW THIS EVENING...WITH PRIMARY THREAT FROM
POSSIBLE DERECHO MCS EVOLVING AND TRACKING ESEWD ALONG SURFACE FRONT
INTO ERN NEB/WRN IA BY 06-09Z. OTHER ISOLATED SEVERE STORMS CAN BE
EXPECTED AHEAD OF THIS MCS NEAR AND NORTH OF THE FRONT. WIND DAMAGE
MAY BECOME WIDESPREAD/SIGNIFICANT WITH MAIN MCS. LARGE HAIL /SOME
OF WHICH COULD BECOME QUITE LARGE/DAMAGING/ IS ALSO
POSSIBLE...ESPECIALLY WITH STORMS AHEAD OF MAIN LINE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27035.
...EVANS
IOWA COUNTIES INCLUDED ARE
BUENA VISTA CHEROKEE CRAWFORD
HARRISON IDA MONONA
PLYMOUTH POTTAWATTAMIE SAC
SHELBY WOODBURY
NEBRASKA COUNTIES INCLUDED ARE
ANTELOPE BOONE BOYD
BURT BUTLER CEDAR
COLFAX CUMING CUSTER
DAKOTA DIXON DODGE
DOUGLAS GARFIELD GREELEY
HOLT HOWARD KNOX
MADISON MERRICK NANCE
PIERCE PLATTE POLK
SARPY SAUNDERS SHERMAN
STANTON THURSTON VALLEY
WASHINGTON WAYNE WHEELER
SOUTH DAKOTA COUNTIES INCLUDED ARE
BON HOMME CHARLES MIX CLAY
GREGORY UNION YANKTON