Severe Thunderstorm Watch 684

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 684
NWS STORM PREDICTION CENTER NORMAN OK
510 PM CDT FRI JUL 11 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF NORTHWEST IOWA
PARTS OF SOUTHERN MINNESOTA
PARTS OF NORTHEAST NEBRASKA
SMALL PART OF SOUTHEAST SOUTH DAKOTA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 510 PM UNTIL
1100 PM CDT.
HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
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 35 MILES NORTHWEST OF
MANKATO MINNESOTA TO 15 MILES SOUTH SOUTHWEST OF COLUMBUS
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.
DISCUSSION...THUNDERSTORMS WILL INCREASE RAPIDLY IN NUMBER AND
INTENSITY ALONG THE STRONG COLD FRONT NOW MOVING EWD INTO SWRN MN
INTO NERN NE. WITH MLCAPES TO 3500 J/KG AND 40KT OF
SHEAR...SUPERCELLS WILL BE POSSIBLE ENHANCING THE DAMAGING WIND AND
LARGE HAIL THREAT AS STORMS SPREAD EWD ACROSS THE WATCH.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 25025.
...HALES
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CALHOUN CARROLL
CHEROKEE CLAY CRAWFORD
DICKINSON EMMET HARRISON
HUMBOLDT IDA KOSSUTH
LYON MONONA O'BRIEN
OSCEOLA PALO ALTO PLYMOUTH
POCAHONTAS SAC SHELBY
SIOUX WINNEBAGO WOODBURY
MINNESOTA COUNTIES INCLUDED ARE
BLUE EARTH BROWN COTTONWOOD
FARIBAULT JACKSON LE SUEUR
LYON MARTIN MURRAY
NICOLLET NOBLES PIPESTONE
ROCK WASECA WATONWAN
NEBRASKA COUNTIES INCLUDED ARE
ANTELOPE BOONE BURT
CEDAR COLFAX CUMING
DAKOTA DIXON DODGE
GREELEY HOWARD MADISON
MERRICK NANCE PIERCE
PLATTE POLK STANTON
THURSTON WASHINGTON WAYNE
SOUTH DAKOTA COUNTIES INCLUDED ARE
UNION