During the last two days of June, a favorable synoptic weather pattern brought extreme heat to western Wisconsin as ample moisture resulted in remarkably high dewpoints. Consequently, heat indices soared well above 100 degrees with numerous locations seeing heat indices of 105 to 115 degrees.
Every event with a place to put it; 13 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ARX wrote it up.
During the last two days of June, a favorable synoptic weather pattern brought extreme heat to western Wisconsin as ample moisture resulted in remarkably high dewpoints. Consequently, heat indices soared well above 100 degrees with numerous locations seeing heat indices of 105 to 115 degrees. June 29th was the hottest day, but extreme heat persisted into the 30th for areas south of Interstate 90 where heat indices in excess of 100 degrees were still common.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS La Crosse, WI wrote its last area forecast discussion before the first event at Jun 29, 5:06 AM CST, 6 hours 54 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service La Crosse WI 135 AM CDT Mon Jun 29 2026 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ029-032>034- 041>044-053>055-061-301100- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-Clark- Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- Crawford-Richland-Grant- 135 AM CDT Mon Jun 29 2026 This Hazardous Weather Outlook is for portions of north central Iowa...northeast Iowa...southeast Minnesota...central Wisconsin... southwest Wisconsin and west central Wisconsin. .DAY ONE...Today and Tonight An Extreme Heat Warning remains in effect from 8 am today to 9 pm Tuesday. Dangerously hot conditions with heat index values of 100 to 110 are expected. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Daytime heat index values will reach above 100 degrees through at least mid-week. Multiple rounds of storms could impact the region this week, some of which could be severe. However, confidence in the location and severity of these storms is low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed tonight in southeast Minnesota and northeast Iowa. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. WIZ017-301100- Taylor- 135 AM CDT Mon Jun 29 2026 This Hazardous Weather Outlook is for portions of north central Wisconsin. .DAY ONE...Today and Tonight A Heat Advisory remains in effect from 8 am today to 9 pm Tuesday. Heat index values of 95 to 105 are expected. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Daytime heat index values will reach above 95 degrees through at least mid-week. Multiple rounds of storms could impact the region this week, some of which could be severe. However, confidence in the location and severity of these storms is low at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed tonight in north-central Wisconsin. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Boyne
The national radar mosaic for the moment the first event began.
13 excessive heat. Local standard time, as filed.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 105 to 109 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 109 degrees in Grand Marsh.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 95 to 105 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 105 degrees in Montana.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 100 to 111 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 111 degrees in Colby.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 102 to 106 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 106 degrees in Steuben. On June 30th, widespread heat indices over 100 degrees persisted throughout much of the daytime hours.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 102 to 107 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 107 degrees in Boscobel. On June 30th, widespread heat indices over 100 degrees persisted throughout much of the daytime hours.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 103 to 109 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 109 degrees in Black River Falls.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 100 to 105 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 105 degrees at Volk Field.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 102 to 113 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 113 degrees in Bangor. On June 30th, continued heat indices over 100 degrees persisted throughout much of the daytime hours.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 107 to 114 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 114 degrees in Tomah. On June 30th, continued heat indices over 100 degrees persisted throughout much of the daytime hours.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 105 to 112 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 112 degrees in Soldiers Grove. On June 30th, continued heat indices over 100 degrees persisted throughout much of the daytime hours.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 100 to 110 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 110 degrees in Gilman.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 100 to 104 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 104 degrees in Osseo.
A period of extreme heat moved into the region during the end of June with widespread heat indices over 100 degrees. On June 29th, heat indices ranged from 105 to 113 degrees across the county during the afternoon and early evening. The highest heat index observed in the county was 113 degrees in Genoa. On June 30th, continued heat indices over 100 degrees persisted throughout much of the daytime hours.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2026Every state in 2026This day in weather historyWarnings in Wisconsin, June 2026
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1355303, 1355306, 1355345, 1355350, 1355351, 1355353, 1355354, 1355389, 1355390, 1355391, 1355392, 1355393, 1355394.