Several supercell thunderstorms developed within the warm sector of a broad surface low over central Wisconsin. The clusters of storms tracked southeastward through south central Wisconsin during the afternoon and early evening.
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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 MKX wrote it up.
Several supercell thunderstorms developed within the warm sector of a broad surface low over central Wisconsin. The clusters of storms tracked southeastward through south central Wisconsin during the afternoon and early evening. Sporadic wind damage to trees and power lines occurred including hail around one inch in diameter.
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 Milwaukee, WI wrote its last area forecast discussion before the first event at Jun 24, 12:17 PM CST, 1 hour 43 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 117 PM CDT Wed Jun 24 2026 .KEY MESSAGES... - Chances for thunderstorms on and off through this evening. A Slight Risk for severe thunderstorms this afternoon and early evening, with the main hazards damaging winds and hail, especially in areas that see clearing in the early afternoon hours. A tornado or two will also be possible. - Active shower/storm pattern develops for Saturday night through Wednesday next week. - A strong warming trend is expected early next week, potentially nearing Heat Advisory criteria Monday through Wednesday. && .SHORT TERM... Issued 117 PM CDT Wed Jun 24 2026 This afternoon through Thursday night: As rain from this morning exits the southeast, watching the potential for new development that has begun along a boundary stretched largely west to east across the central forecast area. Instability will gradually increase this afternoon, with a few pockets of clearing within the widespread mostly cloudy conditions. Will also see a potential for storms to develop late afternoon into early evening along a weak cold front approaching from the northwest. Given surface based CAPE expected to increase to around 2000 J/kg (especially from Madison westward) along with 0-6 km bulk shear upwards of 40 kt, still thinking a few strong to severe storms will be possible this afternoon into the evening. The activity along the front may have a better chance to reach severe levels, given likely more available instability. Hail and wind remain the main severe concerns, though not out of the question for a tornado or two. Will have to watch the potential for localized flooding concerns this afternoon and evening given a narrow swath of 1.5 to 3 inches of rain that fell this morning. If additional storms produce heavy rainfall over these already saturated areas, some localized areal or flash flooding could occur. Showers and a few rumbles of thunder may linger mainly north of I-94 late evening as a surface low slowly moves through, with dry weather expected overnight behind the low. A few showers will be possible mainly across the northeast half of the forecast area from late Thursday morning into early evening. This will be due to a weak vort max swinging through lingering cyclonic flow along with possible additional lift due to low level convergence as winds turn onshore near the lake. Not out of the question for a few rumbles of thunder as well. Otherwise, skies should be partly cloudy with highs in the 70s once again. DDV && .LONG TERM... Issued 117 PM CDT Wed Jun 24 2026 Friday through Wednesday: The upper level flow is expected to be zonal on Friday, with upper level ridging beginning to build in from the west on Saturday. Dry weather is expected both days under surface high pressure. Temps will remain a bit below normal Friday, warming back to around normal Saturday as the upper ridge builds in. Upper level ridging will continue to strengthen across the Midwest and Northeast United States early next week, with increasing temperatures likely for southern Wisconsin. Dewpoints will increase as well, with a chance for Heat Advisory conditions Monday through Wednesday, especially if it remains dry during the daytime periods. That said, there is a chance that storms could move through the top of the ridge and impact southern Wisconsin once or twice from Sat night through early next week. Confidence is on the lower end in any potential precip timing at this point. DDV && .AVIATION... Issued 117 PM CDT Wed Jun 24 2026 Watching the potential for new storm development that has begun along a boundary stretched largely west to east across the central forecast area. Will also see a potential for storms to develop late afternoon into early evening along a weak cold front approaching from the northwest. Still thinking a few strong to severe storms will be possible this afternoon into the evening. Hail and wind remain the main severe concerns, though not out of the question for a tornado or two. Showers and a few rumbles of thunder may linger mainly north of I-94 late evening as a surface low slowly moves through, with dry weather expected overnight behind the low. A few showers will be possible mainly across the northeast half of the forecast area from late morning into early evening Thursday. A mix of VFR/MVFR/IFR ceilings will continue this afternoon into the evening along with rounds of showers and storms. Should see a transition to VFR conditions tonight with some MVFR ceilings possible Thursday morning, mainly north of I-94. Outside of variable winds near storms, prevailing winds should remain light from the west to southwest into this evening, gradually becoming west to northwest overnight into Thursday morning as low pressure gradually exits to the east. DDV && .MARINE... Issued 117 PM CDT Wed Jun 24 2026 Weak low pressure around 29.9 inches in northern Minnesota will result in southerly winds across the lake today. As this system pushes eastward through northern WI this evening we expect winds to decelerate, turning east over northern portions of the lake and remaining south over the southern half. Showers and thunderstorms are expected at times today and tonight with the passage of this system. Light northwesterly winds are expected Thursday as low pressure departs eastward. High pressure around 30.1 inches over Ontario and the western Great Lakes will dominate Friday through Saturday with light north to northeast winds likely. Sunday, low pressure deepens to 29.4 inches over the Central Plains, bringing breezy southeasterly winds to the lake. Winds turn southerly and strengthen into Monday as low pressure exits into the Canadian Prairies. On and off thunderstorms become more likely during this time. DDV && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Visit us at weather.gov/milwaukee Follow us on Facebook, X, and YouTube at: www.facebook.com/NWSMilwaukee www.x.com/NWSMilwaukee www.youtube.com/NWSMilwaukee
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 126 PM CDT Wed Jun 24 2026 WIZ046-047-051-052-056>060-062>072-251830- Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 126 PM CDT Wed Jun 24 2026 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin and southeast Wisconsin. .DAY ONE...This Afternoon and Tonight There are chances for thunderstorms today, with a threat for some strong to severe storms this afternoon and early evening. Large hail, damaging winds, and frequent lightning would be the main concerns with any stronger storms, though a tornado or two is also possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There are 30 percent chances for thunderstorms Thursday afternoon over eastern Wisconsin. A sharp warming trend is expected into early next week, with advisory-level heat looking possible. Additional chances for showers and thunderstorms early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. LMZ643>646-251830- Sheboygan to Port Washington WI- Port Washington to North Point Light WI- North Point Light to Wind Point WI- Wind Point WI to Winthrop Harbor IL- 126 PM CDT Wed Jun 24 2026 This Hazardous Weather Outlook is for the nearshore waters from Sheboygan Wisconsin to Winthrop Harbor Illinois. .DAY ONE...This Afternoon and Tonight Showers and thunderstorms are expected at times today into tonight. A few stronger storms with hail and gusty winds will be possible this afternoon and early evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There are chances for thunderstorms Thursday afternoon as well as early next week. Winds and waves may approach Small Craft Advisory levels early next week. LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-251830- Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.- Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake- Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake- Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake- Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake- 126 PM CDT Wed Jun 24 2026 This Hazardous Weather Outlook is for the open waters of Lake Michigan. .DAY ONE...This Afternoon and Tonight There are chances for thunderstorms today and tonight. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There are chances for thunderstorms at times early next week. www.weather.gov/mkx
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
148 PM CDT Wed Jun 24 2026
WIZ062-063-241930-
Iowa WI-Dane WI-
148 PM CDT Wed Jun 24 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN IOWA AND
SOUTHWESTERN DANE COUNTIES THROUGH 230 PM CDT...
At 147 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles west of Mount Horeb, moving southeast at 15 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Mount Horeb, Black Earth, Barneveld, Blue Mounds, Ridgeway, and Blue
Mound St Park.
This includes U.S. Highway 18 between mile markers 53 and 70.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4314 9015 4313 8969 4292 8967 4292 8984
4303 9014
TIME...MOT...LOC 1847Z 293DEG 15KT 4304 8994
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
WAGNERSpecial Weather Statement
National Weather Service Milwaukee/Sullivan WI
239 PM CDT Wed Jun 24 2026
WIZ067-242030-
Lafayette WI-
239 PM CDT Wed Jun 24 2026
...STRONG THUNDERSTORMS WILL IMPACT WESTERN LAFAYETTE COUNTY THROUGH
330 PM CDT...
At 238 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms near Shullsburg, or 9 miles southwest of Darlington,
moving east at 20 mph.
HAZARD...Wind gusts up to 40-50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Darlington, Shullsburg, Belmont, Benton, New Diggings, Elk Grove,
Gratiot, and Lead Mine.
This includes U.S. Highway 151 between mile markers 23 and 27.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Wisconsin.
&&
LAT...LON 4272 9001 4260 9000 4251 9005 4251 9042
4276 9042
TIME...MOT...LOC 1938Z 288DEG 18KT 4260 9027
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
WAGNERThe Quad Cities radar (KDVN), 119 km away, was scanning. The volume nearest the first event began at 20:01 UTC.
4 thunderstorm wind, 3 hail, 1 funnel cloud. Local standard time, as filed.
Power lines were reported down south of Belmont.
A funnel cloud was reported near Fulton.
There was a report of three large tree limbs down from a healthy tree in Milton.
A large tree branch was reported down near the intersection of Elm and West Streets.
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 2026-09-24. Each event’s entry at NCEI: 1353450, 1353445, 1353452, 1353446, 1353451, 1353448, 1353453, 1353449.