Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 49, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at May 27, 2026, 6:55 PM CDT for Waushara County, Wisconsin. It was in force for 20 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 27, 2026, 6:55 PM CDT (23:55 UTC)
- Expired
- May 27, 2026, 7:15 PM CDT
- In force
- 20 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Waushara County, WI
The radar
The Green Bay radar (KGRB), 125 km from the middle of the area, began a volume at 23:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 27, 6:58 PM CDT | TSTM WND DMG | 5 Wsw Coloma, WI | Corrects time of previous tstm wnd dmg report from 5 WSW Coloma. Delayed report via social media. Time estimated by radar. Damage to irrigation towers, farm storage building and trees. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 3 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 333 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 146 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 1326 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
089 WUUS53 KGRB 272355 SVRGRB WIC137-280015- /O.NEW.KGRB.SV.W.0049.260527T2355Z-260528T0015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Green Bay WI 655 PM CDT Wed May 27 2026 The National Weather Service in Green Bay has issued a * Severe Thunderstorm Warning for... Southwestern Waushara County in central Wisconsin... * Until 715 PM CDT. * At 654 PM CDT, a severe thunderstorm was located 7 miles northwest of Westfield, or 12 miles east of Friendship, moving south at 35 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * This severe thunderstorm will remain over mainly rural areas of southwestern Waushara County, including the following locations... Coloma. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4409 8960 4409 8951 4398 8946 4398 8960 TIME...MOT...LOC 2354Z 351DEG 30KT 4398 8957 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ KLJ
1 follow-up statement
526 WWUS53 KGRB 280010 SVSGRB Severe Weather Statement National Weather Service Green Bay WI 710 PM CDT Wed May 27 2026 WIC137-280017- /O.EXP.KGRB.SV.W.0049.000000T0000Z-260528T0015Z/ Waushara WI- 710 PM CDT Wed May 27 2026 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WAUSHARA COUNTY WILL EXPIRE AT 715 PM CDT... The storm which prompted the warning has moved out of the area. Therefore, the warning will be allowed to expire. Lightning is still possible. To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service Green Bay. && LAT...LON 4409 8960 4409 8951 4398 8946 4398 8960 TIME...MOT...LOC 0007Z 351DEG 30KT 4388 8955 $$ KLJ
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at May 27, 6:09 PM CDT, 46 minutes earlier. Its key messages:
- Isolated to scattered thunderstorms are possible for the rest of the afternoon and early evening. A few storms could become strong to severe with damaging winds and hail, especially in central WI and the western Fox Valley between 4 pm and 8 pm.
- Conditions hazardous to small craft are expected tonight for the Lake Michigan nearshore waters south of Sturgeon Bay. Boaters should exercise caution on the bay of Green Bay this evening.
- There is a high risk for rip currents tonight for beaches along Lake Michigan in Manitowoc County.
- Mainly dry weather with above normal temperatures and low relative humidity for the next week, with highs mainly in the middle 70s to middle 80s.
Area forecast discussion, May 27, 6:09 PM CDT, 46 minutes before
Area Forecast Discussion National Weather Service Green Bay WI 609 PM CDT Wed May 27 2026 Updated aviation portion for 00Z TAF issuance .KEY MESSAGES... - Isolated to scattered thunderstorms are possible for the rest of the afternoon and early evening. A few storms could become strong to severe with damaging winds and hail, especially in central WI and the western Fox Valley between 4 pm and 8 pm. - Conditions hazardous to small craft are expected tonight for the Lake Michigan nearshore waters south of Sturgeon Bay. Boaters should exercise caution on the bay of Green Bay this evening. - There is a high risk for rip currents tonight for beaches along Lake Michigan in Manitowoc County. - Mainly dry weather with above normal temperatures and low relative humidity for the next week, with highs mainly in the middle 70s to middle 80s. && .DISCUSSION... Issued at 153 PM CDT Wed May 27 2026 A back door cold front over northern WI will shift south across the region this afternoon and early evening. Scattered showers have already developed along the boundary. CAMs continue to show thunderstorms initiating along the boundary by around 20z, spreading south through the rest of afternoon, then exiting our southern counties in the early evening. The arrival of cooler and drier air behind the cold front and E-NE winds off Lake Michigan will limit instability in northern and eastern WI, with better instability (SBCAPE 1000-1500) expected over central WI and the western Fox Valley. This is also the area where DCAPE calues are currently highest (800-1000 j/kg). With Effective bulk shear increasing to around 30 kts near the cold front, ingredients are in place for a few strong to severe storms, especially in central WI and the western Fox Valley. Damaging winds and hail will be the primary threats. The front should shift south of the region early this evening, bringing a period of gusty northeast winds to the Fox Valley and lakeshore areas, a period of high waves to our southernmost Lake Michigan marine zones, and a high threat of rip currents for Manitowoc County beaches. A Beach Hazards Statement has been issued from this evening through early Thursday morning for Manitowoc County. Canadian high pressure and an Omega Block pattern will bring a long stretch of mainly dry weather. Right now, only small precipitation chances are expected with a back door cold front late Sunday into Sunday night. Ttemperatures will average well above normal through much of the period, with highs mainly in the mid 70s to mid 80s. Low afternoon relative humidity could lead to elevated fire weather conditions, but green-up continues across northern WI and pine fuels have become less volatile, so impacts may not be as significant as they would have been a couple weeks ago. && .AVIATION...for 00Z TAF Issuance Issued at 558 PM CDT Wed May 27 2026 Scattered showers and thunderstorms, with MVFR or IFR VSBY's due to heavy rain south of Highway 29, will come to an end by 01z. Otherwise, VFR conditions will prevail through Thursday afternoon. Gusty northeast winds will overspread the entire region by 03z Thursday, then continue overnight through Thursday afternoon. && .GRB WATCHES/WARNINGS/ADVISORIES... Beach Hazards Statement from 9 PM this evening to 3 AM CDT Thursday for WIZ050. && DISCUSSION.....Kieckbusch AVIATION.......Eckberg
Hazardous weather outlook, May 27, 2:00 PM CDT, 4 hours 55 minutes before
Hazardous Weather Outlook National Weather Service Green Bay WI 200 PM CDT Wed May 27 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-281900- 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- 200 PM CDT Wed May 27 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Rest of this Afternoon and Tonight Scattered thunderstorms are possible for the rest of this afternoon and early evening, except across far northern and eastern Wisconsin. A few storms could become strong to severe with damaging winds and hail, especially over central Wisconsin and the western Fox Valley between 4 pm and 8 pm. There is a high risk for rip currents tonight for beaches along Lake Michigan in Manitowoc County. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report any wind damage or hail to the National Weather Service in Green Bay. LMZ521-522-541>543-281900- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 200 PM CDT Wed May 27 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight Isolated thunderstorms are possible for the rest of this afternoon. Any thunderstorms would pose a hazard to mariners. Gusty northeast winds will bring conditions hazardous to small craft tonight to the Lake Michigan nearshore waters south of Sturgeon Bay. A Small Craft Advisory is in effect. The gusty winds also mean boaters should exercise caution on the bay of Green Bay this evening. .DAYS TWO THROUGH SEVEN...Thursday through Wednesday The probability for widespread hazardous weather is low. Kieckbusch
In the hours before
Local storm report, May 27, 5:16 PM CDT, 1 hour 39 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
516 PM CDT Wed May 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0450 PM Tstm Wnd Dmg 1 NW Mosinee 44.80N 89.71W
05/27/2026 Marathon WI Public
Several trees down at River Park in Mosinee.
Time estimated by radar. Report from
WSAW-TV.
&&Local storm report, May 27, 5:41 PM CDT, 1 hour 14 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
541 PM CDT Wed May 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0538 PM Hail 3 W Plover 44.45N 89.60W
05/27/2026 M1.00 Inch Portage WI Public
&&Special weather statement, May 27, 5:43 PM CDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Green Bay WI
543 PM CDT Wed May 27 2026
WIZ035-036-272315-
Wood WI-Portage WI-
543 PM CDT Wed May 27 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN WOOD AND
NORTHWESTERN PORTAGE COUNTIES THROUGH 615 PM CDT...
At 543 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles southeast of Marshfield, or 14 miles north of Wisconsin Rapids,
moving south at 25 mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This storm will remain over mainly rural areas of northeastern Wood
and northwestern Portage Counties, including the following
locations... Milladore, Sherry, Powers Bluff County Park, Auburndale,
Blenker, Arpin, Rudolph, Vesper, Junction City, and Biron.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4466 9006 4467 8978 4444 8974 4443 9009
TIME...MOT...LOC 2243Z 352DEG 22KT 4459 8993
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
KLJLocal storm report, May 27, 6:21 PM CDT, 34 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
621 PM CDT Wed May 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0602 PM Tstm Wnd Gst 1 ENE Port Edwards 44.36N 89.84W
05/27/2026 M51 MPH Wood WI AWOS
Recorded at South Wood County Airport.
&&Local storm report, May 27, 6:24 PM CDT, 31 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
624 PM CDT Wed May 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM Rain Rib Mountain 44.91N 89.67W
05/27/2026 M1.65 Inch Marathon WI Public
Report relayed via social media.
&&Special weather statement, May 27, 6:46 PM CDT, 9 minutes before
Special Weather Statement
National Weather Service Green Bay WI
646 PM CDT Wed May 27 2026
WIZ045-280030-
Waushara WI-
646 PM CDT Wed May 27 2026
...A STRONG THUNDERSTORM WILL IMPACT WESTERN WAUSHARA COUNTY THROUGH
730 PM CDT...
At 646 PM CDT, Doppler radar was tracking a strong thunderstorm 11
miles south of Plainfield, or 12 miles west of Wautoma, moving south
at 30 mph.
HAZARD...Wind gusts up to 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.
This storm will remain over mainly rural areas of western Waushara
County, including the following locations... Coloma, Hancock, and
Richford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4398 8960 4422 8960 4423 8946 4398 8940
TIME...MOT...LOC 2346Z 351DEG 25KT 4405 8955
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
KLJThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 1:00 AM CDT | Beach Hazards Statement | GRB | Manitowoc | 26 hr |
| May 27, 1:00 AM CDT | Small Craft Advisory | GRB | 26 hr | |
| May 27, 2:56 PM CDT | Special Weather Statement | GRB | Oneida | 34 min |
| May 27, 3:15 PM CDT | Special Weather Statement | GRB | Marathon | 45 min |
| May 27, 3:27 PM CDT | Severe Thunderstorm Warning | GRB | Langlade, Lincoln, Marathon | 48 min |
| May 27, 3:59 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 46 min |
| May 27, 4:36 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 39 min |
| May 27, 5:00 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 30 min |
| May 27, 5:13 PM CDT | Areal Flood Advisory | GRB | Marathon | 3 hr |
| May 27, 5:19 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 26 min |
| May 27, 5:26 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 49 min |
| May 27, 5:43 PM CDT | Special Weather Statement | GRB | Wood | 32 min |
| May 27, 6:46 PM CDT | Special Weather Statement | GRB | Waushara | 44 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.