Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 22, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Apr 13, 2026, 7:58 PM CDT for Wood County, Wisconsin. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 13, 2026, 7:58 PM CDT (00:58 UTC)
- Expired
- Apr 13, 2026, 8:45 PM CDT
- In force
- 47 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Wood County, WI
The radar
The La Crosse radar (KARX), 116 km from the middle of the area, began a volume at 00:57 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 13, 3:11 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.0 hours before the alert went out and 285 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
- 141 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 183 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
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 Apr 13, 7:46 PM CDT, 12 minutes earlier. Its key messages:
- Thunderstorms will develop late this afternoon and continue into the overnight hours with hail in excess of 2 inches, damaging winds and a tornado possible with the strongest storms. The highest risk is across central Wisconsin.
- Rainfall amounts of 1 to 3 inches across parts of central into east-central Wisconsin may lead to additional flood concerns through tonight.
- An active stretch of weather continues through late week with continued periods of showers and storms. The risk area for severe storms shifts south on Tuesday, but extends north into parts of central and east-central Wisconsin.
- Minor to moderate river flooding is ongoing or forecast to occur on several area rivers. Expect many rivers to rise this week due to additional rain and runoff from Upper Michigan, with the greatest impacts expected on the Menominee River, where some locations may see major flooding during the mid to late part of the week.
Area forecast discussion, Apr 13, 7:46 PM CDT, 12 minutes before
Area Forecast Discussion National Weather Service Green Bay WI 746 PM CDT Mon Apr 13 2026 Updated aviation portion for 00Z TAF issuance .KEY MESSAGES... - Thunderstorms will develop late this afternoon and continue into the overnight hours with hail in excess of 2 inches, damaging winds and a tornado possible with the strongest storms. The highest risk is across central Wisconsin. - Rainfall amounts of 1 to 3 inches across parts of central into east-central Wisconsin may lead to additional flood concerns through tonight. - An active stretch of weather continues through late week with continued periods of showers and storms. The risk area for severe storms shifts south on Tuesday, but extends north into parts of central and east-central Wisconsin. - Minor to moderate river flooding is ongoing or forecast to occur on several area rivers. Expect many rivers to rise this week due to additional rain and runoff from Upper Michigan, with the greatest impacts expected on the Menominee River, where some locations may see major flooding during the mid to late part of the week. && .DISCUSSION... Issued at 245 PM CDT Mon Apr 13 2026 Tonight: Severe Storms/Heavy Rain Early afternoon surface analysis indicated a surface low over central Nebraska with a warm front snaking eastward across northern Iowa into central Wisconsin. MLCAPE has increased to around 1000 J/kg across central Wisconsin with some inhibition noted. Late this afternoon, expect more focused storm initiation/intensification generally in the vicinity of the warm front and nose of the low- level jet. Surface-based instability is maximized over central Wisconsin (1000-2000 J/kg) by late this afternoon with effective shear around 40-50 kts. Combined with steep lapse rates already sampled by the 18Z GRB RAOB, the environment will be supportive of large to very large hail. The tornado risk likely will be highest along the warm front from west-central Wisconsin into perhaps central Wisconsin as the low-level jet increases early this evening and overlaps the warm front/instability axis. Damaging wind risk will depend on the degree of upscale growth/organization of storms. Overall, the severe weather risk lessens with northward extent. Precipitable water values remain near the top of climatology for mid April. HREF probability matched mean 24-hr rainfall is in the 1 to 3 inch range across parts of central into east-central Wisconsin through tonight, on the nose of the low-level jet. However, rainfall amounts will depend on the organization and degree of training. This rainfall could exacerbate already saturated soils. Areas of fog may also develop overnight behind the storms. Tuesday: Additional storms The front slides south on Tuesday with the instability axis also displaced south. The placement of the boundary will impact the northward extent of severe weather during the afternoon/evening. RAP hodographs show lesser low-level shear although an elongated profile favorable for large hail and winds. Currently the highest risk of severe storms is across southern Wisconsin, but could extend into parts of east-central Wisconsin. Wednesday-Monday: Active into the weekend Southwest flow aloft persists into late week keeping the area in a warm, wet pattern. Another shortwave trough will bring additional shower (40-80%) chances Wednesday into Thursday. A more dynamic trough is slated to impact the region late Friday into the weekend bringing additional widespread rainfall and storms. The northward extent of greater instability is somewhat uncertain with this system, impacting severe weather potential, but this will be something to watch in the coming days. Drier and cooler weather is expected behind this system for early next week. && .AVIATION...for 00Z TAF Issuance Issued at 746 PM CDT Mon Apr 13 2026 Widespread showers and storms will continue to impact AUW/CWA/ATW /GRB/MTW this evening. The strongest storms could contain heavy rain, hail and gusty winds. Some fog will along linger near Lake Michigan. The activity will end west to east from 03-07z. Low clouds and fog will linger overnight, with clouds lifting and scattering out later Tuesday morning and afternoon. Another round of storms is possible at ATW/GRB/MTW Tuesday afternoon. && .HYDROLOGY... Issued at 245 PM CDT Mon Apr 13 2026 Flooding is expected to continue on several area rivers during the week, and will be exacerbated by periodic heavy rainfall. Runoff from Upper Michigan is still expected to bring moderate to major flooding along the Menominee River, especially during the mid to late part of the week. If you live near a river or stream, keep a close eye on water levels this week and monitor the latest Flood Warnings from the National Weather Service in Green Bay. && .GRB WATCHES/WARNINGS/ADVISORIES... Flood Watch until 7 AM CDT Tuesday for WIZ013-018>022-030-031- 035>040-045-048>050-073-074. && DISCUSSION.....JM AVIATION.......Bersch HYDROLOGY......Kieckbusch/JM
Hazardous weather outlook, Apr 13, 2:51 PM CDT, 5 hours 7 minutes before
Hazardous Weather Outlook National Weather Service Green Bay WI 251 PM CDT Mon Apr 13 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-142000- 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- 251 PM CDT Mon Apr 13 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight Elevated water levels or flooding continue along some rivers. Severe storms, including heavy rainfall, large to very large hail, damaging winds and tornado or two are possible late this afternoon into tonight. The highest risk of severe storms is across central into east- central Wisconsin. Additional flooding may occur for areas that receive heavy rainfall tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Monday There is a chance of severe thunderstorms south of a line from Wisconsin Rapids to Sturgeon bay during the late afternoon and evening on Tuesday. Large hail and strong winds will be the primary threats. Additional thunderstorms are possible Wednesday afternoon into Wednesday night, and again Friday night into Saturday. Elevated water levels and at least minor flooding will continue along many rivers through the week. Runoff from the Upper Peninsula will likely result in moderate to possibly major flooding on the Menominee River during the mid to late part of the week. .SPOTTER INFORMATION STATEMENT... Spotters should report severe weather and flooding to the National Weather Service in Green Bay. LMZ521-522-541>543-142000- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 251 PM CDT Mon Apr 13 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Tonight Thunderstorms, some possibly strong to severe, are expected tonight. Areas of fog are possible. .DAYS TWO THROUGH SEVEN...Tuesday through Monday Thunderstorms will be possible at times Tuesday through Wednesday night, and again Friday night into Saturday. Severe storms will be possible Tuesday evening.
In the hours before
Local storm report, Apr 13, 7:43 PM CDT, 15 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
743 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0737 PM Hail 2 WNW Green Bay 44.52N 88.03W
04/13/2026 M1.25 Inch Brown WI Trained Spotter
Quarter sized to half dollar sized hail.
Corner of Allard Ave. and Camm Place.
&&
JLALocal storm report, Apr 13, 7:46 PM CDT, 12 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
746 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0735 PM Hail 1 NNE Ashwaubenon 44.50N 88.05W
04/13/2026 E0.88 Inch Brown WI Broadcast Media
At WLUK-TV.
&&
JLALocal storm report, Apr 13, 7:48 PM CDT, 10 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
748 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0606 PM Hail 2 N Marshfield 44.69N 90.16W
04/13/2026 M2.00 Inch Marathon WI Public
&&Local storm report, Apr 13, 7:51 PM CDT, 7 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
751 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0728 PM Flood 1 NNW Clintonville 44.63N 88.76W
04/13/2026 Waupaca WI Trained Spotter
Flooding on N. 12th St. near Sun Valley
Manor.
&&
JLALocal storm report, Apr 13, 7:53 PM CDT, 5 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
753 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM Hail 1 NW Clintonville 44.63N 88.77W
04/13/2026 M1.00 Inch Waupaca WI Cocorahs
&&Local storm report, Apr 13, 7:57 PM CDT, 1 minute before
Preliminary Local Storm Report
National Weather Service Green Bay WI
757 PM CDT Mon Apr 13 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0730 PM Flood 1 NW Clintonville 44.63N 88.77W
04/13/2026 Waupaca WI Cocorahs
Very heavy rain observed of 1.25 inches in
30 minutes. Several streets under water.
&&The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 7:02 PM CDT | Areal Flood Advisory | GRB | Outagamie, Shawano, Waupaca | 3 hr |
| Apr 13, 7:19 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln, Marathon | 14 min |
| Apr 13, 7:22 PM CDT | Severe Thunderstorm Warning | GRB | Outagamie, Shawano, Waupaca | 38 min |
| Apr 13, 7:30 PM CDT | Special Weather Statement | GRB | Brown | 30 min |
| Apr 13, 7:31 PM CDT | Special Marine Warning | GRB | 89 min | |
| Apr 13, 7:36 PM CDT | Special Weather Statement | GRB | Waupaca | 24 min |
| Apr 13, 7:39 PM CDT | Severe Thunderstorm Warning | GRB | Brown, Kewaunee | 51 min |
| Apr 13, 7:41 PM CDT | Severe Thunderstorm Warning | GRB | Portage, Shawano, Waupaca | 49 min |
| Apr 13, 7:57 PM CDT | Special Marine Warning | GRB | 2 hr | |
| Apr 13, 8:06 PM CDT | Flash Flood Warning | GRB | Marathon, Outagamie, Portage, Shawano, Waupaca | 8 hr |
| Apr 13, 8:22 PM CDT | Severe Thunderstorm Warning | GRB | Brown, Kewaunee, Manitowoc | 42 min |
| Apr 13, 8:36 PM CDT | Areal Flood Advisory | GRB | Brown, Oconto, Outagamie | 3 hr |
| Apr 13, 8:36 PM CDT | Severe Thunderstorm Warning | GRB | Portage, Wood | 35 min |
| Apr 13, 9:10 PM CDT | Severe Thunderstorm Warning | GRB | Portage, Waushara, Wood | 50 min |
| Apr 13, 9:26 PM CDT | Special Weather Statement | GRB | Brown | 34 min |
| Apr 13, 9:30 PM CDT | River Flood Warning | GRB | Waupaca | 5 days |
| Apr 13, 9:32 PM CDT | River Flood Warning | GRB | Wood | 63 hr |
| Apr 13, 9:56 PM CDT | Special Weather Statement | GRB | Waupaca | 34 min |
| Apr 13, 10:01 PM CDT | Flash Flood Warning | GRB | Brown, Door, Kewaunee, Oconto, Outagamie | 6 hr |
| Apr 13, 10:16 PM CDT | River Flood Warning | GRB | Wood | 70 hr |
| Apr 13, 10:21 PM CDT | Areal Flood Advisory | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Portage and 4 more | 6 hr |
| Apr 13, 10:35 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Outagamie, Winnebago | 55 min |
| Apr 13, 10:54 PM CDT | Flash Flood Warning | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Winnebago | 5 hr |
| Apr 13, 11:27 PM CDT | Special Weather Statement | GRB | Calumet, Manitowoc | 33 min |
| Apr 14, 2:14 AM CDT | Flash Flood Watch | GRB | Waupaca | 3 hr |
| Apr 14, 2:40 AM CDT | River Flood Warning | GRB | Brown | 21 days |
| Apr 14, 3:52 AM CDT | Areal Flood Advisory | GRB | Brown, Calumet, Door, Kewaunee, Manitowoc, Marathon and 6 more | 6 hr |
| Apr 14, 4:57 AM CDT | River Flood Warning | GRB | Marinette | 6 days |
| Apr 14, 6:02 AM CDT | Areal Flood Warning | GRB | Outagamie, Shawano, Waupaca | 5 hr |
| Apr 14, 8:46 AM CDT | Flash Flood Watch | GRB | Shawano, Waupaca | 25 hr |
| Apr 14, 9:07 AM CDT | River Flood Warning | GRB | Wood | 21 days |
| Apr 14, 9:08 AM CDT | River Flood Warning | GRB | Manitowoc | 21 days |
| Apr 14, 9:43 AM CDT | Areal Flood Warning | GRB | Brown, Door, Kewaunee, Oconto, Outagamie, Shawano and 1 more | 9 hr |
| Apr 14, 9:48 AM CDT | Areal Flood Warning | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie | 9 hr |
| Apr 14, 10:16 AM CDT | Flash Flood Warning | GRB | Waupaca | 6 hr |
| Apr 14, 11:23 AM CDT | River Flood Warning | GRB | Marathon | 34 hr |
| Apr 14, 2:09 PM CDT | River Flood Warning | GRB | Kewaunee | 32 hr |
| Apr 14, 4:37 PM CDT | River Flood Warning | GRB | Brown, Outagamie | 44 hr |
| Apr 14, 5:53 PM CDT | Severe Thunderstorm Warning | GRB | Wood | 37 min |
| Apr 14, 6:10 PM CDT | Severe Thunderstorm Warning | GRB | Waushara, Winnebago | 50 min |
| Apr 14, 6:33 PM CDT | Special Weather Statement | GRB | Portage, Wood | 27 min |
| Apr 14, 6:46 PM CDT | Areal Flood Advisory | GRB | Portage, Wood | 2 hr |
| Apr 14, 6:51 PM CDT | Areal Flood Warning | GRB | Brown, Door, Kewaunee, Oconto, Outagamie, Shawano and 1 more | 9 hr |
| Apr 14, 6:53 PM CDT | Areal Flood Warning | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie | 9 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.