Low pressure tracking from northern Missouri to southern Lake MI spread rounds of thunderstorms across far southern WI. This eventually led to flash flooding in Rock and Walworth Counties after 4-6 inches of rain had fallen.
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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.
Low pressure tracking from northern Missouri to southern Lake MI spread rounds of thunderstorms across far southern WI. This eventually led to flash flooding in Rock and Walworth Counties after 4-6 inches of rain had fallen.
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 18, 1:53 PM CST, 1 hour 27 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 253 PM CDT Wed Jun 18 2025 .KEY MESSAGES... - Widespread showers and isolated storms this afternoon and night. Urban and small stream flooding will be possible into the early evening. - 20-30 percent chances for showers and storms for Thu-Fri. - Hot and humid conditions are looking more likely for the weekend into early next week. Maximum heat index values of 100 to 105 degrees are forecast each day. && .SHORT TERM... Issued 253 PM CDT Wed Jun 18 2025 Tonight through Thursday night: A shortwave trough and sfc low over north central IL will continue to nrn IN by 00Z. The arching band of strong convection has moved into IN but bands of rainfall are prevalent nw of the low over srn WI. Over srn WI, PVA and weak low to mid level frontogenesis will continue to produce efficient showers and isolated storms into this evening. MLCAPE around 500 J/KG will support the isold storm potential, but moist soundings and PWs of 1.5-1.7 inches will make for efficient rainfall rates. Thus will maintain the potential for urban and small stream flooding into this evening. Later tnt a mid level shortwave trough currently over srn MN will track sewd across srn WI, which will keep intermittent showers and still efficient rain producers over the area. The showers may linger briefly beyond 12Z Thu followed by partly cloudy skies with temps returning to the lower 80s for much of S WI. A few showers or storms over central WI Thu afternoon and night could move into the MQT County area ewd to Sheboygan County via a developing warm advection pattern over central WI. Gehring && .LONG TERM... Issued 253 PM CDT Wed Jun 18 2025 Friday through Wednesday: A digging trough along the Pacific Northwest shoreline sets the stage for a building ridge across the Plains on Friday, with a jet max riding around the base of the trough and enhances the ridging into the Upper Midwest by Saturday. Ridging continues to build northeastward, with southern Wisconsin well within the ridge and upper level (300 to 250 mb) winds shifting to become southwesterly by Sunday. Very hot and humid conditions are expected across southern Wisconsin as surface to 850 mb ridging over the southeast U.S. brings in a swath of Gulf moisture through the weekend into early next week. Heat index values in the lower 100s are expected, with the potential for values to climb above 105 degrees in some areas. Stiff southwesterly breezes throughout the weekend will also allow for hot, moist air to reach all the way to the Lake Michigan shoreline and produce heat index values in the lower 100s as well. With the initial inflow of Gulf moisture on Friday, potential for thunderstorms (15 to 35 percent chance) develop throughout the day and exit into the overnight hours. Timing and placement of these storms will determine their intensity, as they will once again be highly dependent on upstream convection earlier on Thursday. As southern Wisconsin becomes more entrenched in the large scale subsidence under the ridge Saturday and Sunday, thunderstorm development potential ends. Monday, expecting the bulk of the ridge to remain in place with heat index values near 100 degrees. However, the 200 mb jet max begins to lift into the Upper Midwest and produce rounds of thunderstorms across northern Wisconsin and southern Minnesota, leading to additional cloud cover and cooler overall conditions while remaining quite hot. Chances for thunderstorms (20 to 50 percent chance) may move in from the upstream area where the best trigger exists. By Tuesday, the jet streak exits farther into eastern Canada, bringing additional lift across the northern Wisconsin to southern Minnesota region and therefore leading to additional thunderstorm development. Kept NBM probabilities (50 to 70 percent range), but concerns remain that surface ridging may win out and keep convection confined to southwestern Wisconsin. Cloud cover will at minimum provide some relief from the heat, with heat index values in the 80s and 90s. Ridging begins to break down by Wednesday, with additional chances for rain and storms (approximately 60 percent chance) and a return to seasonable temperatures in the 80s. MH && .AVIATION... Issued 253 PM CDT Wed Jun 18 2025 AReas of MVFR Cigs and Vsbys over S WI this afternoon and tonight with fairly widespread showers and isolated storms expected. Local Cigs below 1 kft at times as well as 1-2SM with the heavier showers or storms. Low stratus will become scattered by late Thu AM. VFR conditions afterward. Gehring && .MARINE... Issued 253 PM CDT Wed Jun 18 2025 Low pressure around 29.7 inches over central Illinois will move to the southern tip of Lake Michigan by early evening, then to southern Lake Huron late tonight. Light and variable winds will become modest north to northwest winds after the low passes by early this evening. Light north to northwest winds Thursday morning will then back to southwesterly for Thursday afternoon into Friday. Breezy southerly winds can then be expected for the weekend as strong low pressure develops over the Dakotas. Gehring && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Visit us at weather.gov/milwaukee Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSMilwaukee www.twitter.com/NWSMilwaukee www.youtube.com/NWSMilwaukee
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 244 PM CDT Wed Jun 18 2025 WIZ046-047-051-052-056>060-062>072-191945- Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 244 PM CDT Wed Jun 18 2025 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin and southeast Wisconsin. .DAY ONE...Tonight Widespread showers and embedded storms will produce areas of heavy rainfall into this evening. Urban and small stream flooding will be possible. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday Hot and humid conditions are forecast Saturday through Monday. Heat index values will range from 100 to 105 degrees. There are chances for thunderstorms at times Thursday night into Friday night and again Monday night into Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not needed this evening. Rainfall reports are be appreciated. LMZ643>646-191945- 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- 244 PM CDT Wed Jun 18 2025 This Hazardous Weather Outlook is for the nearshore waters from Sheboygan Wisconsin to Winthrop Harbor Illinois. .DAY ONE...Tonight Areas of fog will be possible. Isolated thunderstorms are also forecast. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday Patchy fog will be possible Thursday morning. There are chances for thunderstorms at times Thursday afternoon into Saturday morning, and again for early next week. LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-191945- 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- 244 PM CDT Wed Jun 18 2025 This Hazardous Weather Outlook is for the open waters of Lake Michigan. .DAY ONE...Tonight Areas of fog may develop over the open waters of Lake Michigan. Isolated to scattered thunderstorms are also forecast. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday Areas of fog may linger Thursday morning. There are chances for thunderstorms at times Thursday night through Friday night, and again into early next week. www.weather.gov/mkx
The Milwaukee radar (KMKX), 44 km away, was scanning. The volume nearest the first event began at 21:22 UTC.
2 flash flood. Local standard time, as filed.
Several streets flooded and closed in Clinton.
Numerous streets flooded in and around Delavan. A creek flooded in Delavan. Videos and pictures provided.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2025Every state in 2025This day in weather historyWarnings in Wisconsin, June 2025
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: 1259109, 1259112.