A line of thunderstorms developed north of a warm front and tracked through central and east-central Wisconsin during the afternoon on Wednesday (6/10). The strongest storms produced wind damage and severe wind gusts as they tracked through the region.
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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 GRB wrote it up.
A line of thunderstorms developed north of a warm front and tracked through central and east-central Wisconsin during the afternoon on Wednesday (6/10). The strongest storms produced wind damage and severe wind gusts as they tracked through the region.
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 Green Bay, WI wrote its last area forecast discussion before the first event at Jun 10, 12:02 PM CST, 2 hours 13 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Green Bay WI 102 PM CDT Wed Jun 10 2026 Forecast discussion for routine afternoon forecast issuance .KEY MESSAGES... - Severe storms are expected this afternoon and evening (2-7 PM), bringing damaging winds, large hail, and a brief tornado threat to central, parts of north-central, and east-central Wisconsin. - Another round of severe weather is possible Thursday afternoon and evening, mainly over east-central Wisconsin. - Heavy rain is an increasing hazard through Thursday. Localized flooding is expected where heavy rain occurs. - Dense fog will continue to pose a hazard to mariners along the Lake Michigan shoreline. - Cooler, drier air arrives for the weekend, with intermittent rain chances through Tuesday. && .DISCUSSION... Issued at 102 PM CDT Wed Jun 10 2026 The latest RAP analysis and satellite/radar imagery show a potent northern Plains trough is lifting northeast into south-central Canada, pushing a cold front east across western Minnesota. An effective warm front extends from near Minneapolis to Fond Du Lac early this afternoon, establishing a volatile and highly unstable warm sector across southern Wisconsin. Even further south, an shortwave impulse and associated convection over Iowa and southeast Minnesota is primed to track northeastward, providing large- scale ascent later today. Severe Thunderstorm Potential This Afternoon/Evening: Destabilization is expected this afternoon as this mornings thunderstorm activity has exited. Extremely strong instability resides south of the warm front, where surface- based CAPE values are ramping into the 3000-4000 J/kg range, driven by surface temperatures warming into the middle 80s and dewpoints pooling into the middle 70s. Steep mid- level lapse rates of 7-8 C/km and downdraft CAPE in excess of 1000 J/kg point to a volatile airmass highly favorable for severe weather. As a shortwave impulse tracking out of Iowa provides deep layer forcing, storms are expected to gradually intensify as they shift northeastward between 3 PM and 8 PM. Convective evolution carries some uncertainty, as high- resolution guidance splits between a consolidated cold pool bowing system and discrete clusters or broken line segments. Damaging wind gusts and large hail are the primary threats. However, an isolated tornado threat cannot be ruled out near the effective warm front across central to east- central Wisconsin where low- level flow is locally backed. The greatest severe threat is expected south of a Rhinelander to Manitowoc line where a Severe Thunderstorm Watch is in effect. Some CAMS indicate develop additional thunderstorms along the cold front due to move across the region late this evening. While expectation is that the atmosphere will be worked over thereby limiting buoyancy potential, an isolated strong storm will be possible. The threat of storms will diminish by early overnight. Thursday Severe Potential: The main surface cold front will settle downstate overnight. After a lull Thursday morning, a very dynamic shortwave trough will drive a surface low pressure system northeastward across the region Thursday afternoon into early Thursday evening. Model spread remains rather large regarding the exact track of the surface low, leading to below normal forecast confidence. The general consensus navigates the surface low across east-central Wisconsin late Thursday afternoon. Areas south of this track will possess the highest severe weather threat. Instability will be substantially lower than today, maxing out near 1000 J/kg, but wind fields will be considerably stronger. Given the robust wind fields aloft, significant instability will not be required, just sufficient for severe weather. Damaging winds and an isolated tornado will be possible from the lows triple point southward, placing east-central Wisconsin at the greatest risk for severe weather. Sfc highs will range from the mid 70s to low 80s. Friday Wind and Marine Impacts: A cooler and drier weather pattern returns on Friday in the wake of the departing surface low as a longwave trough establishes itself from Hudson Bay into the western Great Lakes. A tight pressure gradient on the southern periphery of the trough will foster breezy conditions across the entire area. Sfc wind gusts of 30 to 35 mph are expected over land, and these strong winds will likely necessitate a Small Craft Advisory across the nearshore waters of Lake Michigan and Green Bay due to building waves. Weekend and Extended Outlook: Spotty showers and storms will linger over north-central Wisconsin Thursday night behind the main surface low, but dry conditions return for most locations by Friday morning. Saturday looks to be the more active day of the weekend as a secondary cold front drops south. Instability will moderate to around 500-700 J/kg by Saturday afternoon, which when combined with mid-level wind fields of 30-50 kts, will support a few storms capable of gusty winds. Behind this second front, a distinct cooling trend takes hold. Temperatures in the low 70s to low 80s through Saturday will fall back into the mid 60s to mid 70s from Sunday through Tuesday. The next appreciable chance for widespread rainfall will arrive on Tuesday as a northern stream shortwave digs into the western Great Lakes. && .AVIATION...for 18Z TAF Issuance Issued at 1235 PM CDT Wed Jun 10 2026 Main forecast challenges are timing additional rounds of convection this afternoon and evening as well as low clouds/fog preceding and following. Most favorable timing for thunderstorms appears to be in the 21-02Z timeframe. Any storms are capable of winds to 60 mph and large hail, as well as frequent lightning. Prior to the storms, stubborn IFR clouds at the beginning of the TAF should scatter out quickly, except likely lingering into mid-afternoon at MTW. Tonight, lower clouds and fog may redevelop, but confidence is low on flight categories and duration. Maintained MVFR cigs/fog for now. Expect these to dissipate after sunrise on Thursday. && .GRB WATCHES/WARNINGS/ADVISORIES... Beach Hazards Statement through Thursday morning for WIZ022-040- 050. && DISCUSSION.....MPC AVIATION.......MQT
Hazardous Weather Outlook National Weather Service Green Bay WI 102 PM CDT Wed Jun 10 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-111815- Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln- Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano- Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago- Calumet-Manitowoc-Southern Marinette County- Southern Oconto County- 102 PM CDT Wed Jun 10 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...This Afternoon and Tonight Severe storms are expected this afternoon and evening (2-7 PM), bringing damaging winds, large hail, and a brief tornado threat to central, parts of north-central, and east-central Wisconsin. Localized heavy rain and flooding could become an issue for areas where repeated rounds of thunderstorms occur. Dangerous swimming conditions are expected to develop along Lake Michigan beaches from late afternoon through late tonight. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday Another round of strong to severe thunderstorms and heavy rain are expected Thursday afternoon and Thursday evening over northeast Wisconsin and east-central WI. Localized flooding could occur. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report any wind damage, hail, or flooding to the National Weather Service in Green Bay. LMZ521-522-541>543-111815- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 102 PM CDT Wed Jun 10 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...This Afternoon and Tonight Additional rounds of strong to severe thunderstorms will occur this afternoon into this evening. Any thunderstorm could pose a hazard to mariners. Areas of fog may be dense along the Lake Michigan shoreline through early this evening. A marine dense fog advisory remains in effect. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday Additional thunderstorms are expected Thursday afternoon through Thursday evening. Any thunderstorm could pose a hazard to mariners. Hazardous conditions to small craft are possible on Friday. MPC
Special Weather Statement
National Weather Service Green Bay WI
950 AM CDT Wed Jun 10 2026
WIZ021-031-037>039-048-049-073-074-101545-
Brown WI-Southern Marinette County WI-Northern Oconto County WI-
Waupaca WI-Winnebago WI-Calumet WI-Outagamie WI-Shawano WI-
Southern Oconto County WI-
950 AM CDT Wed Jun 10 2026
...A LINE OF STRONG THUNDERSTORMS WILL IMPACT SOUTHERN MARINETTE...
NORTHERN CALUMET...SOUTHEASTERN WAUPACA...NORTHEASTERN WINNEBAGO...
OUTAGAMIE...EASTERN SHAWANO...BROWN AND SOUTHERN OCONTO COUNTIES
UNTIL 1045 AM CDT...
At 950 AM CDT, Doppler radar was tracking a line of strong
thunderstorms extending from 13 miles south of Pound to 9 miles west
of Menasha, or extending from 24 miles northwest of Bay Shore Park to
11 miles west of Appleton, moving east at 30 mph.
HAZARD...Wind gusts up to 40 to 45 mph mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
The strong thunderstorm will be near...
Pulaski and Black Creek around 955 AM CDT. Appleton, Menasha and
Northern Lake Winnebago around 1000 AM CDT. Little Chute and
Kimberly around 1005 AM CDT. Kaukauna, Darboy, Bellevue Town and
Long Tail Point Light around 1010 AM CDT. Brillion around 1030 AM
CDT.
Other locations impacted by this strong thunderstorm include Chicago
Corners, Murphy Corner, Oneida, Mackville, Anston, Stiles,
Flintville, Abrams, South Chase and Chase.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
Torrential rainfall is also occurring with these storms and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4427 8910 4461 8831 4501 8833 4516 8772
4511 8766 4509 8759 4514 8760 4512 8754
4493 8765 4491 8778 4471 8793 4464 8794
4469 8774 4433 8777 4433 8789 4424 8789
4424 8804 4414 8804
TIME...MOT...LOC 1450Z 290DEG 27KT 4491 8810 4454 8821 4422 8861
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
JMThe La Crosse radar (KARX), 161 km away, was scanning. The volume nearest the first event began at 20:17 UTC.
9 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed trees in Athens. The time of this report is an estimate based on radar data.
Thunderstorm winds produced significant damage to farm buildings and uprooted a large pine tree south of Oshkosh. The time of this report is an estimate based on radar data.
Thunderstorms produced a wind gust to around 70 mph at the Oshkosh Airport.
Thunderstorm winds downed numerous trees and power lines in Oshkosh. The time of this report is an estimate based on radar data.
Thunderstorm winds downed trees and power lines near Darboy.
Thunderstorm winds downed multiple trees and power lines in Appleton. The time of this report is an estimate based on radar data.
Thunderstorm winds downed trees in Wausau. The time of this report is an estimate based on radar data.
Thunderstorm winds downed trees near Polonia. The time of this report is an estimate based on radar data.
Thunderstorm winds downed trees and power lines in Bowler. The time of this report is an estimate based on radar data.
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: 1332033, 1332039, 1332034, 1352325, 1332035, 1332036, 1332038, 1352337, 1332037.