Tornado Watch 457

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 457
NWS STORM PREDICTION CENTER NORMAN OK
1155 PM CDT WED JUN 4 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
LARGE PARTS OF IOWA
SMALL PART OF NORTHWEST ILLINOIS
SMALL PART OF NORTHEAST MISSOURI
PARTS OF NORTHEAST NEBRASKA
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1155 PM
UNTIL 500 AM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTHWEST OF SIOUX
CITY IOWA TO 50 MILES NORTH NORTHEAST OF BURLINGTON IOWA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.
DISCUSSION...SEVERE THUNDERSTORMS CONTINUE TO DEVELOP AND MOVE EWD
IN STRONG WARM ADVECTION ZONE. WITH 50-60 KT LLJ COUPLED WITH
MLCAPES TO 2000 J/KG...SUPERCELLS AND BOWING SEGMENTS WILL BE THE
PRIMARY MODE. ALONG WITH DAMAGING WINDS...TORNADOES WILL BE POSSIBLE
ACROSS THE WATCH AREA.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24025.
..HALES
. IOWA COUNTIES INCLUDED ARE
ADAIR ADAMS APPANOOSE
AUDUBON BENTON BLACK HAWK
BOONE BREMER BUCHANAN
BUENA VISTA BUTLER CALHOUN
CARROLL CASS CEDAR
CHEROKEE CLARKE CRAWFORD
DALLAS DAVIS DECATUR
DELAWARE DES MOINES DUBUQUE
FRANKLIN GREENE GRUNDY
GUTHRIE HAMILTON HARDIN
HARRISON HENRY HUMBOLDT
IDA IOWA JASPER
JEFFERSON JOHNSON JONES
KEOKUK LEE LINN
LOUISA LUCAS MADISON
MAHASKA MARION MARSHALL
MONONA MONROE MUSCATINE
PLYMOUTH POCAHONTAS POLK
POWESHIEK RINGGOLD SAC
SHELBY STORY TAMA
TAYLOR UNION VAN BUREN
WAPELLO WARREN WASHINGTON
WAYNE WEBSTER WOODBURY
WRIGHT
ILLINOIS COUNTIES INCLUDED ARE
HANCOCK
MISSOURI COUNTIES INCLUDED ARE
CLARK SCOTLAND
NEBRASKA COUNTIES INCLUDED ARE
BURT CUMING DAKOTA
DIXON DODGE THURSTON
WASHINGTON