Iowa Severe Thunderstorm Watch | Effective 04/23/2026 15:58

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 138 IN EFFECT UNTIL MIDNIGHT CDT TONIGHT FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 27 COUNTIES IN CENTRAL IOWA BOONE DALLAS GRUNDY HAMILTON HARDIN JASPER MARSHALL POLK POWESHIEK STORY TAMA IN NORTH CENTRAL IOWA BUTLER CERRO GORDO FRANKLIN WORTH IN NORTHEAST IOWA BLACK HAWK BREMER IN SOUTH CENTRAL IOWA APPANOOSE CLARKE DECATUR LUCAS MADISON MAHASKA MARION MONROE WARREN WAYNE THIS INCLUDES THE CITIES OF ACKLEY, ADEL, ALBIA, ALLERTON, ALLISON, AMES, APLINGTON, BOONE, CARLISLE, CEDAR FALLS, CENTERVILLE, CHARITON, CLARKSVILLE, CLEAR LAKE, CONRAD, CORYDON, DES MOINES, DIKE, DUMONT, DYSART, EARLHAM, ELDORA, GLADBROOK, GREENE, GRINNELL, GRUNDY CENTER, HAMPTON, HUMESTON, INDIANOLA, IOWA FALLS, KNOXVILLE, LAMONI, LEON, MANLY, MARSHALLTOWN, MASON CITY, NEWTON, NORTHWOOD, NORWALK, OSCEOLA, OSKALOOSA, PARKERSBURG, PELLA, PERRY, REINBECK, SEYMOUR, SHELL ROCK, TAMA, TOLEDO, TRAER, WATERLOO, WAUKEE, WAVERLY, WEBSTER CITY, WELLSBURG, AND WINTERSET. * PRIMARY THREATS INCLUDE... SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY. SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE. A TORNADO OR TWO POSSIBLE. PROBABILITY TABLE: PROB OF 2 OR MORE TORNADOES : 20% PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 10% PROB OF 10 OR MORE SEVERE WIND EVENTS : 70% 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 : >95% MEAN STORM MOTION /MPH/ : E 35