Alert archive / Wisconsin / Tornado Warnings in 2026
Tornado Warning 17, NWS Green Bay, WI
NWS Green Bay, WI issued this tornado warning at Jul 20, 2026, 7:43 PM CDT for Langlade County, Menominee County, Shawano County, Wisconsin. It was in force for 47 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
- Jul 20, 2026, 7:43 PM CDT (00:43 UTC)
- Expired
- Jul 20, 2026, 8:30 PM CDT
- In force
- 47 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties Langlade County, WI, Menominee County, WI, Shawano County, WI
The radar
The Green Bay radar (KGRB), 83 km from the middle of the area, began a volume at 00:44 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 |
|---|---|---|---|
| Jul 20, 7:57 PM CDT | TORNADO | 3 Ene Mattoon, WI | Report from OTUS project via drone video. |
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 tornado warning; the first came 14 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 3:49 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.7 hours before the alert went out and 85 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
- 1492 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 338 m²/s²
- 0-3 km storm-relative helicity
- 464 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 15.7
The text
As transmitted.
056
WFUS53 KGRB 210043
TORGRB
WIC067-078-115-210130-
/O.NEW.KGRB.TO.W.0017.260721T0043Z-260721T0130Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
743 PM CDT Mon Jul 20 2026
The National Weather Service in Green Bay has issued a
* Tornado Warning for...
South Central Langlade County in north central Wisconsin...
Central Menominee County in northeastern Wisconsin...
Western Shawano County in northeastern Wisconsin...
* Until 830 PM CDT.
* At 743 PM CDT, a severe thunderstorm capable of producing a tornado
was located 9 miles south of Antigo, moving southeast at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
* This tornado will be near...
Neopit around 805 PM CDT. Keshena and Legend Lake around 825 PM
CDT.
Other locations impacted by the tornado include Mattoon, Phlox, Zoar,
Lake Noseum, Middle Village, Gresham, College Of Menominee Nation and
Red River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4496 8920 4514 8911 4499 8852 4478 8863
TIME...MOT...LOC 0043Z 292DEG 23KT 4502 8909
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Kurimski3 follow-up statements
186
WWUS53 KGRB 210100
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
800 PM CDT Mon Jul 20 2026
WIC067-210110-
/O.CAN.KGRB.TO.W.0017.000000T0000Z-260721T0130Z/
Langlade WI-
800 PM CDT Mon Jul 20 2026
...TORNADO WARNING IS CANCELLED FOR SOUTH CENTRAL LANGLADE COUNTY...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1100 PM CDT Monday for a
portion of north central Wisconsin.
&&
LAT...LON 4494 8898 4511 8898 4499 8852 4478 8863
4490 8898
TIME...MOT...LOC 0043Z 292DEG 23KT 4502 8908
$$
WIC078-115-210130-
/O.CON.KGRB.TO.W.0017.000000T0000Z-260721T0130Z/
Menominee WI-Shawano WI-
800 PM CDT Mon Jul 20 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR CENTRAL
MENOMINEE AND CENTRAL SHAWANO COUNTIES...
At 800 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Neopit, or 16 miles southeast of Antigo, moving
southeast at 45 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Neopit around 805 PM CDT. Big Smokey Falls around 815 PM CDT.
Legend Lake and Keshena around 825 PM CDT.
Other locations impacted by the tornado include Zoar, Lake Noseum,
Middle Village, Gresham, Intersection Of Hwy 55 And County M, Red
River and College Of Menominee Nation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4494 8898 4511 8898 4499 8852 4478 8863
4490 8898
TIME...MOT...LOC 0043Z 294DEG 36KT 4506 8913
TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN
$$
Kurimski978
WWUS53 KGRB 210108 RRA
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
808 PM CDT Mon Jul 20 2026
WIC078-115-210130-
/O.CON.KGRB.TO.W.0017.000000T0000Z-260721T0130Z/
Menominee WI-Shawano WI-
808 PM CDT Mon Jul 20 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR CENTRAL
MENOMINEE AND CENTRAL SHAWANO COUNTIES...
At 808 PM CDT, a confirmed tornado was located over Neopit, or 17
miles southeast of Antigo, moving southeast at 25 mph.
HAZARD...Damaging tornado.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Neopit around 815 PM CDT. Keshena, Big Smokey Falls and Legend Lake
around 825 PM CDT.
Other locations impacted by the tornado include Zoar, Middle Village,
Intersection Of Hwy 55 And County M and Gresham.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4494 8898 4509 8890 4499 8852 4478 8863
4490 8898
TIME...MOT...LOC 0100Z 295DEG 20KT 4502 8892
TORNADO...OBSERVED
MAX HAIL SIZE...0.00 IN
$$
Kurimski066
WWUS53 KGRB 210122
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
822 PM CDT Mon Jul 20 2026
WIC078-115-210132-
/O.EXP.KGRB.TO.W.0017.000000T0000Z-260721T0130Z/
Menominee WI-Shawano WI-
822 PM CDT Mon Jul 20 2026
...TORNADO WARNING WILL EXPIRE AT 830 PM CDT FOR CENTRAL MENOMINEE
AND CENTRAL SHAWANO COUNTIES...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 1100 PM CDT Monday for a
portion of northeast Wisconsin.
&&
LAT...LON 4494 8898 4509 8890 4499 8852 4478 8863
4490 8898
TIME...MOT...LOC 0108Z 295DEG 20KT 4500 8886
$$
KurimskiWhat forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Jul 20, 6:30 PM CDT, 1 hour 13 minutes earlier. Its key messages:
- Level 3 of 5 risk of severe storms today. Damaging winds, large hail, and a few tornadoes all possible. Highest risk is mid afternoon to early evening (3 to 8 PM).
- Drier and cooler for mid-week.
Area forecast discussion, Jul 20, 6:30 PM CDT, 1 hour 13 minutes before
Area Forecast Discussion National Weather Service Green Bay WI 630 PM CDT Mon Jul 20 2026 Updated aviation portion for 00Z TAF issuance .KEY MESSAGES... - Level 3 of 5 risk of severe storms today. Damaging winds, large hail, and a few tornadoes all possible. Highest risk is mid afternoon to early evening (3 to 8 PM). - Drier and cooler for mid-week. && .DISCUSSION... Issued at 255 PM CDT Mon Jul 20 2026 MLCAPE of 2500-3000 J/KG is building into north central WI at this time on swly flow ahead of a weak sfc trough. Meanwhile 0-8km shear has increased to 50-60 kt across the area. 994 mb low pressure over north central Ontario will deepen slightly 991 mb as it moves near the srn tip of James Bay by 12Z Tue. The pre- frontal sfc trough over nw WI will move across the nrn half of WI late this afternoon and early evening. Sfc convergence along this feature will be modest, but aided by the main upper wave over sw Ontario moving over nrn Lake Superior for late afternoon, and then deepen slightly as it moves across ern Lake Superior this evening. Overall 12hr 500 mb ht. falls of 60-80 meters are expected across the nrn half of WI. Without strong forcing, believe the CAMs are correct with discrete supercells after mainly 21Z into the early evening. Cannot rule out some consolidation of cells farther to the east toward Lake MI and will forecast 50-70 percent chances for showers and storms. Effective SRH of 200 m2/s2 is forecast with 0-1KM SRH of 100-150 m2/s2. LCLs and LFCs will be sufficiently favorable for tornadoes along with the aforementioned low level wind shear. DCAPE of 1200-1600 J/KG will be a limiting factor for tornadoes, and a stronger factor for damaging winds. Overall though, all hazards, possibly significant severe, are forecast. The actual cold front will then pass late tnt on increasing nwly winds. Breezy nwly winds and cold advection will prevail into Tue nt. Broken stratocumulus, relatively cold air aloft and lake effect rain showers from Lake Superior may lead to a few showers over far north central WI late tnt-Tue. Relatively cool temps are forecast Tue-Wed but with less clouds for Wed when high pressure approaches from the west. Nwly flow aloft will then prevail into the weekend. High pressure over MN and IA on Wed will track across the Ohio Valley and into New England for Thu-Fri. Temperatures will climb back to normal for Thu-Fri then above normal for the weekend as swly winds return. Chances for showers and storms return to the forecast for Sat nt-Mon as a weak Canadian cold front will pass or stall over the region. && .AVIATION...for 00Z TAF Issuance Issued at 614 PM CDT Mon Jul 20 2026 KOSH - Scattered thunderstorms will move into eastern WI this evening. The highest chances of storms will be from 01-03z. The storms will be capable of producing gusty winds, hail, and brief heavy rain. Since the storms are scattered, will wait closer to arrival to better pinpoint wind gusts if they should move across the airport. Synoptic winds will gust to 20 to 25 kts through 03z, then wind gusts diminish to around 18 knots into early Tuesday morning. Gusty northwest winds are expected on Tuesday, generally around 25 knots from mid morning through much of the afternoon. For the rest of the area, scattered thunderstorms will end from west to east later this evening. Some of the strongest storms could produce strong winds, hail and brief heavy rain. && .MARINE... Issued at 255 PM CDT Mon Jul 20 2026 Breezy sly winds this evening will become breezy nw winds Tue- Tnt as deep low pressure moves across srn Canada. A Small Craft Advisory is in effect into tnt but will likely need to be extended for Tue-Tue nt. A Beach Hazards Statement will continue through tnt for the Lake MI beaches. && .GRB WATCHES/WARNINGS/ADVISORIES... Beach Hazards Statement through Tuesday morning for WIZ022-040- 050. && DISCUSSION.....MG AVIATION.......Eckberg MARINE.........MG
Hazardous weather outlook, Jul 20, 2:25 PM CDT, 5 hours 18 minutes before
Hazardous Weather Outlook National Weather Service Green Bay WI 225 PM CDT Mon Jul 20 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-211930- 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- 225 PM CDT Mon Jul 20 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Tonight There is a level 3 of 5 risk of severe storms with damaging winds, large hail, tornadoes, and locally heavy rain into this evening. .DAYS TWO THROUGH SEVEN...Tuesday through Monday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report peak wind gusts to the National Weather Service in Green Bay. LMZ521-522-541>543-211930- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 225 PM CDT Mon Jul 20 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. A Beach Hazards Statement is also in effect. There is a chance of thunderstorms late this afternoon and evening that would pose a hazard to mariners .DAYS TWO THROUGH SEVEN...Tuesday through Monday Conditions hazardous to small craft are possible Tuesday into Tuesday night.
In the hours before
Local storm report, Jul 20, 5:20 PM CDT, 2 hours 23 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
520 PM CDT Mon Jul 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0513 PM Hail 1 WNW Spread Eagle 45.88N 88.14W
07/20/2026 M1.00 Inch Florence WI Trained Spotter
Reports of 1 inch hail for 1 minute
duration.
&&
JMFLocal storm report, Jul 20, 6:00 PM CDT, 1 hour 43 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
600 PM CDT Mon Jul 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0535 PM Hail Spread Eagle 45.88N 88.13W
07/20/2026 M1.00 Inch Florence WI Public
Nickel to quarter size hail fell for about
90 seconds in Spread Eagle.
&&
HEKSpecial weather statement, Jul 20, 7:06 PM CDT, 37 minutes before
Special Weather Statement
National Weather Service Green Bay WI
706 PM CDT Mon Jul 20 2026
WIZ018-019-030-031-210100-
Marathon WI-Shawano WI-Langlade WI-Lincoln WI-
706 PM CDT Mon Jul 20 2026
...A LINE OF STRONG THUNDERSTORMS WILL IMPACT MARATHON...SOUTHEASTERN
LINCOLN...LANGLADE AND WESTERN SHAWANO COUNTIES UNTIL 8 PM CDT...
At 706 PM CDT, Doppler radar was tracking a line of strong
thunderstorms extending from 7 miles south of Parrish to over
Spencer, or extending from 17 miles northwest of Antigo to 33 miles
southwest of Wausau, moving east at 35 mph. These storms have a
history of producing funnel clouds.
HAZARD...Wind gusts up to 40 mph and funnel clouds.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Wausau, Antigo, Weston, Merrill, Rib Mountain, Mosinee, Spencer,
Bevent, Wittenberg, Parrish, Dutch Corners, Council Grounds State
Park, Birch Trails Girl Scout Camp, Veterans Memorial County Park,
Pearson, Ma Ka Ja Wan Scout Reservation, Rothschild, Schofield and
Knowlton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 4488 9032 4542 8957 4545 8892 4538 8893
4538 8869 4512 8890 4512 8898 4501 8898
4469 8923 4470 9032
TIME...MOT...LOC 0004Z 269DEG 30KT 4530 8942 4495 8986 4477 9026
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
KurimskiLocal storm report, Jul 20, 7:36 PM CDT, 7 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
736 PM CDT Mon Jul 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0658 PM Funnel Cloud 1 WNW Little Chicago 45.05N 89.87W
07/20/2026 Marathon WI Public
Report on social media.
&&
HEKLocal storm report, Jul 20, 7:37 PM CDT, 6 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
737 PM CDT Mon Jul 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0656 PM Funnel Cloud 2 S Hamburg 45.06N 89.88W
07/20/2026 Marathon WI Public
Report on social media.
&&
HEKLocal storm report, Jul 20, 7:43 PM CDT, 0 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
743 PM CDT Mon Jul 20 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0654 PM Funnel Cloud 1 E Athens 45.03N 90.05W
07/20/2026 Marathon WI Public
Report on social media, location
approximated by radar.
&&
HEKThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 7:06 PM CDT | Special Weather Statement | GRB | Langlade, Marathon | 54 min |
| Jul 20, 7:12 PM CDT | Tornado Warning | GRB | Door | 32 min |
| Jul 20, 7:32 PM CDT | Severe Thunderstorm Warning | GRB | Forest, Marinette | 43 min |
| Jul 20, 7:36 PM CDT | Tornado Warning | GRB | Marathon | 39 min |
| Jul 20, 7:37 PM CDT | Tornado Warning | GRB | Marathon | 38 min |
| Jul 20, 7:53 PM CDT | Tornado Warning | GRB | Marinette | 26 min |
| Jul 20, 7:55 PM CDT | Tornado Warning | GRB | Wood | 50 min |
| Jul 20, 8:04 PM CDT | Tornado Warning | GRB | Marathon, Portage | 41 min |
| Jul 20, 8:06 PM CDT | Tornado Warning | GRB | Marathon, Shawano, Waupaca | 54 min |
| Jul 20, 8:16 PM CDT | Severe Thunderstorm Warning | GRB | Door | 29 min |
| Jul 20, 8:18 PM CDT | Special Marine Warning | GRB | 42 min | |
| Jul 20, 8:25 PM CDT | Special Weather Statement | GRB | Marinette | 35 min |
| Jul 20, 8:41 PM CDT | Tornado Warning | GRB | Portage, Waupaca | 37 min |
| Jul 20, 8:50 PM CDT | Severe Thunderstorm Warning | GRB | Door | 40 min |
| Jul 20, 9:00 PM CDT | Special Marine Warning | GRB | 45 min | |
| Jul 20, 9:17 PM CDT | Special Marine Warning | GRB | 43 min | |
| Jul 20, 9:27 PM CDT | Special Marine Warning | GRB | 63 min | |
| Jul 20, 9:30 PM CDT | Severe Thunderstorm Warning | GRB | Door | 30 min |
| Jul 20, 9:43 PM CDT | Areal Flood Advisory | GRB | Door | 3 hr |
| Jul 20, 9:45 PM CDT | Special Marine Warning | GRB | 15 min | |
| Jul 20, 9:59 PM CDT | Special Weather Statement | GRB | Door | 31 min |
| Jul 20, 10:48 PM CDT | Severe Thunderstorm Warning | GRB | Brown, Outagamie | 27 min |
| Jul 21, 1:49 AM CDT | Small Craft Advisory | GRB | 26 hr |
Nearby
Tornado Warnings in Wisconsin, 2026Every tornado warning in 2026Tornadoes 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.