Thunderstorms developed across the region during the afternoon and evening hours on Tuesday (6/30) due to hot temperatures and unstable conditions. The strongest storms produced wind damage and large hail up to ping pong ball size as they tracked through northeast and east-central Wisconsin.
Every event with a place to put it. 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 GRB wrote it up.
Thunderstorms developed across the region during the afternoon and evening hours on Tuesday (6/30) due to hot temperatures and unstable conditions. The strongest storms produced wind damage and large hail up to ping pong ball size as they tracked through northeast and east-central Wisconsin.
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 30, 1:11 PM CST, 2 hours 59 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Green Bay WI 211 PM CDT Tue Jun 30 2026 Forecast discussion for routine afternoon forecast issuance .KEY MESSAGES... - Dangerous heat peaks this afternoon. An Extreme Heat Warning is in effect through 7 PM today for central, east-central, and far northeast Wisconsin, with a Heat Advisory is in effect elsewhere. Additional heat headlines may be needed Wednesday. - Scattered storms late this afternoon into this evening, with isolated severe storms. Greater chances for severe weather for Wednesday, especially during the afternoon into evening hours. This is now looking like a higher-end severe threat with most area now in an Enhanced Risk (level 3 of 5). - Heavy rain potential Wednesday into Wednesday night. At least isolated instances of flash flooding possible. - Additional chances for thunderstorms through Friday, with chances beginning to diminish for the holiday weekend. - Gusty onshore southerly winds will result in high waves and dangerous currents on Lake Michigan beaches through late this evening. && .DISCUSSION... Issued at 210 PM CDT Tue Jun 30 2026 Precipitation/Thunder Chances...Morning round of storms has exited. Given minimal large scale forcing interacting with MLCAPEs up to 4000J/kg, expect scattered storms to form late this afternoon through this evening, potentially emerging from blossoming cu field from northeast IA into southern WI. With a very moist atmosphere (dew points in the low 70s) resulting in extreme instability, deep-layer shear of 30-40 kts, severe thunderstorms may occur. Coverage of storms is the main question due to the capping across our area that was only enhanced by the morning convection. Large hail, damaging winds, and heavy rainfall will be the main threats. Late tonight into Wednesday morning, good signal that shortwave on leading base of plains trough, along with increasing 850mb-500mb jets will trigger scattered storms in the morning lifting across the area. There may be a break, then additional severe storms are expected to develop due to interaction with outflow from morning storms and approaching trough. These triggers will interact with MUCAPEs up to 3000J/kg and effective shear 50+ kts. Overall a higher-end severe risk is emerging with bowing structures and potential supercells. Thus, there is a potential for all hazards, including wind gusts over 70 mph, hail to golf-ball sized, and isolated tornadoes. At this point, the greatest risk for high-end severe would be mid afternoon into the evening. The storms in the morning could produce severe wind gusts as well, though there is not that great of a signal for that. SPC has placed most of the area in an Enhanced Risk for Day2/Wednesday-Wednesday Night. Another aspect for Wednesday is very heavy rain. PWATs up to 1.8 inches (97th percentile), with slower individual storm motions and increased covergence combined with such high instability point to favoring the high-end QPFs (max of HREF) which suggests at least isolated 4+ inch rainfall amounts could occur if there are repeating rounds of storms. Uncertainty in how storm evolution occurs precludes the issuance of a flood watch attm, but will be adding heavy rain to the forecast to get this messaging out there. Models indicate additional convection may develop on Thursday as the upper-level ridge breaks down; however this will depend greatly on the evolution of convection on Wednesday. A greater chance for showers and thunderstorms appears to be on Friday with the passage of a mid-level shortwave, but it is too early to determine the severe potential. There are signs of an additional shortwave sometime over the 4th of July holiday weekend, but there are timing and placement differences. In general, probabilities from models/ensembles for showers gradually diminish while working through the weekend. We'll have to see if that trend holds up. Into early next week, chances for rain go down further as high pressure settles overhead. Dangerous Heat...Despite the morning storms, temperatures have already recovered to around 90. Those readings along with super high dewpoints in the upper 70s to near 80 is already resulting in apparent temps pushing past 105, with more heating to go during the day. Though technically we will stay below extreme heat criteria over central WI, not going to change heat headlines given how oppressively humid it is and how there was no relief last night. Also not going to extend the headlines through tomorrow with all the uncertainty on how storms will impact temperatures on Wednesday. Will let mid shift assess and re-issue heat headlines for Wednesday if needed. Beyond Wednesday, unsettled weather and temperatures not as warm and dewpoints coming down (including into July 4th) slightly cast doubt on need for additional heat headlines. Upshot is after the heat today, going to take it day-by-day to see gage the needs for additional heat headlines. && .AVIATION...for 18Z TAF Issuance Issued at 1247 PM CDT Tue Jun 30 2026 Morning round of storms has exited. Additional storms expected late this afternoon into this evening. Have kept it simple and framed out prevailing thunder for a few hours, though it will likely not be widespread and prevailing as this. Conditions will be VFR, though like this morning, a direct hit from a TSRA would result in brief IFR vsby. After a lull late evening through overnight, another round of storms is expected to arrive over the entire area on Wednesday morning. Gusty winds could occur with that round of storms, but will address this with later updates when confidence increases. Southwest winds will increase today, with gusts up to 20 kts. Winds subside late this evening and stay remain less than 10 kts on Wednesday morning. && .GRB WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 7 PM CDT this evening for WIZ005-010-011-018- 019. Extreme Heat Warning until 7 PM CDT this evening for WIZ012-013- 020>022-030-031-035>040-045-048>050-073-074. Beach Hazards Statement through late tonight for WIZ022-040-050. && DISCUSSION.....JLA AVIATION.......JLA
Hazardous Weather Outlook National Weather Service Green Bay WI 244 PM CDT Tue Jun 30 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-011945- 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- 244 PM CDT Tue Jun 30 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight Extreme heat warnings and heat advisories will expire at 7 PM this evening. Isolated strong to severe thunderstorms are expected into this evening. The main hazards are large hail, damaging winds, and heavy rainfall. There is an increased risk of rip currents at Lake Michigan beaches. .DAYS TWO THROUGH SEVEN...Wednesday through Tuesday Daytime heat index values will be near 100 degrees on Wednesday, especially over east-central WI. A Heat Advisory may be needed. Thunderstorms are expected Wednesday morning, then again Wednesday afternoon into Wednesday evening. The storms on Wednesday morning could produce strong wind gusts. The storms Wednesday afternoon into Wednesday evening may result in a higher-end severe risk, with the potential for damaging winds over 70 mph, hail up to golf-ball sized hail, and an isolated tornado. Heavy rain is expected Wednesday and Wednesday night, which could produce at least isolated instances of flash flooding. Periodic chances for thunderstorms will continue through late this week. A few storms on Thursday could be strong to severe. Heavy rain could also occur. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report peak wind gusts, hail, and any flooding to the National Weather Service in Green Bay. Spotter activation may be needed on Wednesday. LMZ521-522-541>543-011945- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 244 PM CDT Tue Jun 30 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight Conditions hazardous to small craft are expected on Lake Michigan due to persistent southerly winds and building waves. There is a chance for thunderstorms this evening into tonight. Any thunderstorm would pose a hazard to mariners. .DAYS TWO THROUGH SEVEN...Wednesday through Tuesday Periodic chances for thunderstorms will last through the upcoming weekend. The greatest risk for severe storms will be Wednesday afternoon into Wednesday evening. Storms occurring Thursday could be strong to severe. Any thunderstorm would pose a hazard to mariners. JLA
Special Weather Statement
National Weather Service Green Bay WI
405 PM CDT Tue Jun 30 2026
WIZ018-302130-
Lincoln WI-
405 PM CDT Tue Jun 30 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN LINCOLN COUNTY
UNTIL 430 PM CDT...
At 405 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles south of Dutch Corners, or 14 miles north of Wausau, moving
northeast at 20 mph.
HAZARD...Wind gusts up to 30 mph and half inch 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...
Merrill around 405 PM CDT. Dutch Corners around 415 PM CDT.
Other locations impacted by this strong thunderstorm include Doering,
Gleason and Bloomville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 4512 8970 4513 8974 4532 8953 4525 8943
4516 8943 4512 8947
TIME...MOT...LOC 2104Z 217DEG 18KT 4516 8956
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
UhlmannSpecial Weather Statement
National Weather Service Green Bay WI
414 PM CDT Tue Jun 30 2026
WIZ019>021-030-031-035>037-074-302215-
Wood WI-Menominee WI-Southern Oconto County WI-Shawano WI-
Northern Oconto County WI-Waupaca WI-Marathon WI-Portage WI-
Langlade WI-
414 PM CDT Tue Jun 30 2026
...AN AREA OF STRONG THUNDERSTORMS WILL IMPACT MENOMINEE...NORTHERN
PORTAGE...NORTHWESTERN WAUPACA...SOUTHEASTERN MARATHON...SOUTHEASTERN
LANGLADE...WESTERN SHAWANO...NORTH CENTRAL WOOD AND NORTHERN OCONTO
COUNTIES UNTIL 515 PM CDT...
At 414 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms from 10 miles east of Marshfield and northwest Waupaca
County and across eastern Marathon, western Shawano, and western
Menominee counties, moving northeast at 35 mph.
HAZARD...Wind gusts up to 50 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.
Locations impacted include...
Knowlton, Mosinee, Rothschild, Weston, Bevent, Ringle, Wittenberg,
Marion, Red River, Neopit, Keshena, Legend Lake, Big Smokey Falls,
White Lake, Langlade, Gardner Dam Scout Camp, South Branch,
Mountain and Bear Paw Scout Camp.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 4469 8999 4538 8853 4538 8852 4503 8818
4453 8915 4463 9011
TIME...MOT...LOC 2111Z 239DEG 30KT 4488 8895
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
MPCSpecial Weather Statement
National Weather Service Green Bay WI
438 PM CDT Tue Jun 30 2026
WIZ018-019-302200-
Langlade WI-Lincoln WI-
438 PM CDT Tue Jun 30 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN LINCOLN AND
NORTHWESTERN LANGLADE COUNTIES UNTIL 5 PM CDT...
At 438 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles southwest of Parrish, or 20 miles south of Rhinelander, moving
north at 20 mph.
HAZARD...Wind gusts up to 40 mph and half inch 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...
Parrish around 445 PM CDT. Harrison around 455 PM CDT.
Other locations impacted by this strong thunderstorm include Dudley,
Gleason, Bavaria, Bloomville, Otter Lake Campground and Kelly Lynn
Bog Natural Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 4528 8942 4528 8957 4549 8956 4548 8942
4547 8942 4547 8927 4528 8934
TIME...MOT...LOC 2137Z 183DEG 29KT 4535 8945
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
UhlmannPreliminary Local Storm Report
National Weather Service Green Bay WI
452 PM CDT Tue Jun 30 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0345 PM Tstm Wnd Dmg 1 SW Evergreen 44.83N 89.66W
06/30/2026 Marathon WI Emergency Mngr
Tree down on power lines in Kronenwetter.
&&Special Weather Statement
National Weather Service Green Bay WI
508 PM CDT Tue Jun 30 2026
WIZ020-021-030-031-074-302300-
Menominee WI-Southern Oconto County WI-Shawano WI-Northern Oconto
County WI-Marathon WI-
508 PM CDT Tue Jun 30 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTHERN MENOMINEE...EAST
CENTRAL MARATHON...CENTRAL SHAWANO AND SOUTHERN OCONTO COUNTIES UNTIL
6 PM CDT...
At 508 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles south of Neopit, or 12 miles west of Shawano, moving east at 35
mph.
HAZARD...Wind gusts up to 50 mph and half inch 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...
Legend Lake and Keshena around 530 PM CDT. Gillett around 550 PM
CDT.
Other locations impacted by this strong thunderstorm include
Lyndhurst, Gresham, Leopolis, Tilleda, Red River, Thornton, Middle
Village, College Of Menominee Nation, Shawano Lake and Cecil.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 4472 8925 4488 8930 4506 8816 4476 8811
TIME...MOT...LOC 2208Z 257DEG 32KT 4482 8881
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
MPCPreliminary Local Storm Report
National Weather Service Green Bay WI
509 PM CDT Tue Jun 30 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0347 PM Tstm Wnd Dmg 1 SW Evergreen 44.83N 89.66W
06/30/2026 Marathon WI Broadcast Media
Tree fell on a car in Kronenwetter. Report
relayed via WSAW-TV.
&&The Marquette radar (KMQT), 114 km away, was scanning. The volume nearest the first event began at 22:11 UTC.
4 hail, 3 thunderstorm wind. Local standard time, as filed.
Nickel size hail fell near Beecher. The time of this report is an estimate based on radar data.
Half dollar size hail fell near Beecher. The time of this report is an estimate based on radar data.
Thunderstorm winds downed trees near Beecher. The time of this report is an estimate based on radar data.
Half dollar size hail fell in Pembine.
Ping pong size hail fell near Pembine.
Thunderstorm winds produced a wind gust to 60 mph at the Green Bay airport tower.
Thunderstorm winds downed trees in Forestville. 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: 1337361, 1337362, 1337363, 1337359, 1337360, 1337365, 1337366.