Headline:
Severe Thunderstorm Watch issued August 18 at 6:50PM CDT until August 19 at 12:00AM CDT by NWS Des Moines IA
Event:
Severe Thunderstorm Watch
Urgency:
Future
Effective:
August 18, 2026 - 4:50pm
Expires:
August 18, 2026 - 10:00pm
Description:
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
597 IN EFFECT UNTIL MIDNIGHT CDT TONIGHT FOR THE FOLLOWING AREAS
IN IOWA THIS WATCH INCLUDES 17 COUNTIES
IN CENTRAL IOWA
GRUNDY HAMILTON HARDIN
WEBSTER
IN NORTH CENTRAL IOWA
BUTLER CERRO GORDO FRANKLIN
HANCOCK HUMBOLDT KOSSUTH
WRIGHT
IN NORTHEAST IOWA
BLACK HAWK BREMER
IN NORTHWEST IOWA
EMMET PALO ALTO POCAHONTAS
IN WEST CENTRAL IOWA
CALHOUN
THIS INCLUDES THE CITIES OF ACKLEY, ALGONA, ALLISON, APLINGTON,
BELMOND, BRITT, CEDAR FALLS, CLARION, CLARKSVILLE, CLEAR LAKE,
CONRAD, DIKE, DUMONT, EAGLE GROVE, ELDORA, EMMETSBURG,
ESTHERVILLE, FONDA, FORT DODGE, GARNER, GILMORE CITY, GREENE,
GRUNDY CENTER, HAMPTON, HUMBOLDT, IOWA FALLS, KANAWHA, LAKE CITY,
LAURENS, MANSON, MASON CITY, PARKERSBURG, POCAHONTAS, POMEROY,
REINBECK, ROCKWELL CITY, ROLFE, SHELL ROCK, WATERLOO, WAVERLY,
WEBSTER CITY, AND WELLSBURG.
* PRIMARY THREATS INCLUDE...
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE.
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE.
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : = 2 INCHES : 30%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 70%
MEAN STORM MOTION /MPH/ : SE 30
Area Description:
Black Hawk, IA; Bremer, IA; Butler, IA; Calhoun, IA; Cerro Gordo, IA; Emmet, IA; Franklin, IA; Grundy, IA; Hamilton, IA; Hancock, IA; Hardin, IA; Humboldt, IA; Kossuth, IA; Palo Alto, IA; Pocahontas, IA; Webster, IA; Wright, IA
Forcast Office:
NWS Des Moines IA
Sender:
w-nws.webmaster@noaa.gov