615 WWUS63 KDMX 020256 WCNDMX WATCH COUNTY NOTIFICATION FOR WATCH 640 NATIONAL WEATHER SERVICE DES MOINES IA 956 PM CDT TUE SEP 1 2026 IAC033-063-081-091-109-147-151-189-195-021000- /O.NEW.KDMX.SV.A.0640.260902T0256Z-260902T1000Z/ THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 640 IN EFFECT UNTIL 5 AM CDT WEDNESDAY FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 9 COUNTIES IN NORTH CENTRAL IOWA CERRO GORDO HANCOCK HUMBOLDT KOSSUTH WINNEBAGO WORTH IN NORTHWEST IOWA EMMET PALO ALTO POCAHONTAS THIS INCLUDES THE CITIES OF ALGONA, BRITT, CLEAR LAKE, EMMETSBURG, ESTHERVILLE, FONDA, FOREST CITY, GARNER, GILMORE CITY, HUMBOLDT, KANAWHA, LAKE MILLS, LAURENS, MANLY, MASON CITY, NORTHWOOD, POCAHONTAS, AND ROLFE. * PRIMARY THREATS INCLUDE... SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS TO 75 MPH POSSIBLE. 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 : <02% PROB OF 10 OR MORE SEVERE WIND EVENTS : 60% PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 40% PROB OF 10 OR MORE SEVERE HAIL EVENTS : 40% PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 30% PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 90% MEAN STORM MOTION /MPH/ : NE 40 $$