⚠️ Tornado Watch – Adair, IA; Black Hawk, IA; Boone, IA; Bremer, IA; Butler, IA; Cerro Gordo, IA; Dallas, IA; Franklin, IA; Greene, IA; Grundy, IA; Guthrie, 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 – Monday, July 20, 2026

Tornado Watch issued July 20 at 3:03PM CDT until July 20 at 10:00PM CDT by NWS Des Moines IA

Details

THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 500 IN
EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING AREAS

IN IOWA THIS WATCH INCLUDES 29 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

IN SOUTHWEST IOWA

ADAIR

IN WEST CENTRAL IOWA

GREENE GUTHRIE

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

* PRIMARY THREATS INCLUDE…

A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE.
SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
TO 75 MPH POSSIBLE.
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5
INCHES IN DIAMETER POSSIBLE.

PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 70%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 50%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 60%
PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 50%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 40%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 40%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 90%
MEAN STORM MOTION /MPH/ : SE 35

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