⚠️ Severe Thunderstorm Watch – Black Hawk, IA; Boone, IA; Bremer, IA; Butler, IA; Cerro Gordo, IA; Dallas, IA; Franklin, IA; Grundy, IA; Hamilton, IA; Hancock, IA; Hardin, IA; Humboldt, IA; Jasper, IA; Madison, IA; Mahaska, IA; Marion, IA; Marshall, IA; Polk, IA; Poweshiek, IA; Story, IA; Tama, IA; Warren, IA; Webster, IA; Winnebago, IA; Worth, IA; Wright, IA – Friday, August 7, 2026

Severe Thunderstorm Watch issued August 7 at 1:41PM CDT until August 7 at 10:00PM CDT by NWS Des Moines IA

Details

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
541 IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING
AREAS

IN IOWA THIS WATCH INCLUDES 26 COUNTIES

IN CENTRAL IOWA

BOONE DALLAS GRUNDY
HAMILTON HARDIN JASPER
MARSHALL POLK POWESHIEK
STORY TAMA WEBSTER

IN NORTH CENTRAL IOWA

BUTLER CERRO GORDO FRANKLIN
HANCOCK HUMBOLDT WINNEBAGO
WORTH WRIGHT

IN NORTHEAST IOWA

BLACK HAWK BREMER

IN SOUTH CENTRAL IOWA

MADISON MAHASKA MARION
WARREN

THIS INCLUDES THE CITIES OF ACKLEY, ADEL, ALLISON, AMES,
APLINGTON, BELMOND, BOONE, BRITT, CARLISLE, CEDAR FALLS, CLARION,
CLARKSVILLE, CLEAR LAKE, CONRAD, DES MOINES, DIKE, DUMONT,
DYSART, EAGLE GROVE, EARLHAM, ELDORA, FOREST CITY, FORT DODGE,
GARNER, GLADBROOK, GREENE, GRINNELL, GRUNDY CENTER, HAMPTON,
HUMBOLDT, INDIANOLA, IOWA FALLS, KANAWHA, KNOXVILLE, LAKE MILLS,
MANLY, MARSHALLTOWN, MASON CITY, NEWTON, NORTHWOOD, NORWALK,
OSKALOOSA, PARKERSBURG, PELLA, PERRY, REINBECK, SHELL ROCK, TAMA,
TOLEDO, TRAER, WATERLOO, WAUKEE, WAVERLY, WEBSTER CITY,
WELLSBURG, AND WINTERSET.

* 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 : 10%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : <02%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 50%
PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 20%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 50%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 30%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 80%
MEAN STORM MOTION /MPH/ : SE 35

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.