Alert archive / Wisconsin / Tornado Warnings in 2026

Tornado Warning 2, NWS Green Bay, WI

April 17, 2026Marathon County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Apr 17, 2026, 4:21 PM CDT for Marathon County, Wisconsin. It was in force for 39 min. 5 reports 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: Apr 17, 2026, 4:21 PM CDT (21:21 UTC)
Expired: Apr 17, 2026, 5:00 PM CDT
In force: 39 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Marathon County, WI

The radar

The Green Bay radar (KGRB), 129 km from the middle of the area, began a volume at 21:25 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
Apr 17, 4:39 PM CDT	FUNNEL CLOUD	1 Sw Evergreen, WI
Apr 17, 4:41 PM CDT	HAIL 0.25	1 Nw Rothschild, WI
Apr 17, 4:46 PM CDT	TORNADO	3 Wsw Ringle, WI	Corrects previous tornado report from 3 WSW Ringle. Ringle Tornado. The tornado developed about 3 miles west-southwest of Ringle, near County Road J and Weston Avenue, at about 4:46 pm. The tornado moved northeast, crossing highway 29 and downing hundreds of t
Apr 17, 4:46 PM CDT	TORNADO	3 Wsw Ringle, WI	Ringle Tornado. The tornado developed about 3 miles west-southwest of Ringle, near County Road J and Weston Avenue, at about 4:46 pm. The tornado moved northeast, crossing highway 29 and downing hundreds of trees. It then moved through neighborhoods along and
Apr 17, 4:51 PM CDT	TORNADO	1 Se Weston, WI	Damage to houses.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 17, 9:23 AM CDT	Severe Thunderstorm Watch	SPC	11 hr
Apr 17, 12:40 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 308 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2301 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

671 
WFUS53 KGRB 172121
TORGRB
WIC073-172200-
/O.NEW.KGRB.TO.W.0002.260417T2121Z-260417T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
421 PM CDT Fri Apr 17 2026

The National Weather Service in Green Bay has issued a

* Tornado Warning for...
  Southeastern Marathon County in central Wisconsin...

* Until 500 PM CDT.

* At 421 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Mosinee, or 16 miles south of Wausau, moving
  northeast at 35 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Mosinee around 430 PM CDT. Rib Mountain around 440 PM CDT. Weston
  around 445 PM CDT. Wausau around 450 PM CDT.

Other locations impacted by the tornado include Moon, Knowlton, Big
Eau Pleine County Park, Dancy, Evergreen, Peplin, Rothschild, Camp
Phillips Scout Camp and Schofield.

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 4468 8983 4474 8990 4499 8956 4485 8938
      4468 8971
TIME...MOT...LOC 2121Z 229DEG 29KT 4475 8977

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Kurimski

4 follow-up statements

519 
WWUS53 KGRB 172133
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
433 PM CDT Fri Apr 17 2026

WIC073-172200-
/O.CON.KGRB.TO.W.0002.000000T0000Z-260417T2200Z/
Marathon WI-
433 PM CDT Fri Apr 17 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 5 PM CDT FOR SOUTHEASTERN
MARATHON COUNTY...

At 433 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Mosinee, or 10 miles south of Wausau, moving
northeast at 35 mph.

HAZARD...Tornado and quarter size hail.

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...
  Mosinee around 435 PM CDT. Rib Mountain around 440 PM CDT. Weston
  around 445 PM CDT. Wausau around 450 PM CDT.

Other locations impacted by the tornado include Evergreen, Peplin,
Rothschild, Camp Phillips Scout Camp and Schofield.

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 4472 8965 4479 8979 4481 8980 4499 8956
      4485 8938
TIME...MOT...LOC 2121Z 229DEG 29KT 4475 8977

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Kurimski

190 
WWUS53 KGRB 172138
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
438 PM CDT Fri Apr 17 2026

WIC073-172200-
/O.CON.KGRB.TO.W.0002.000000T0000Z-260417T2200Z/
Marathon WI-
438 PM CDT Fri Apr 17 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 5 PM CDT FOR SOUTHEASTERN
MARATHON COUNTY...

At 438 PM CDT, a confirmed tornado was located near Weston, or 9
miles south of Wausau, moving northeast at 35 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Emergency management 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...
  Mosinee and Rib Mountain around 440 PM CDT. Weston and Wausau
  around 445 PM CDT.

Other locations impacted by the tornado include Evergreen,
Rothschild, Peplin, Camp Phillips Scout Camp and Schofield.

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 4472 8965 4479 8979 4481 8980 4499 8956
      4485 8938
TIME...MOT...LOC 2133Z 235DEG 28KT 4481 8964

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Kurimski

829 
WWUS53 KGRB 172146
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
446 PM CDT Fri Apr 17 2026

WIC073-172200-
/O.CON.KGRB.TO.W.0002.000000T0000Z-260417T2200Z/
Marathon WI-
446 PM CDT Fri Apr 17 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 5 PM CDT FOR SOUTHEASTERN
MARATHON COUNTY...

At 446 PM CDT, a confirmed tornado was located over Weston, or 8
miles southeast of Wausau, moving northeast at 35 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Emergency management 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...
  Weston, Wausau and Rib Mountain around 450 PM CDT.

Other locations impacted by the tornado include Camp Phillips Scout
Camp, Schofield and Rothschild.

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 4478 8952 4485 8962 4489 8969 4499 8956
      4485 8938
TIME...MOT...LOC 2138Z 232DEG 28KT 4484 8960

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Kurimski

404 
WWUS53 KGRB 172153
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
453 PM CDT Fri Apr 17 2026

WIC073-172203-
/O.EXP.KGRB.TO.W.0002.000000T0000Z-260417T2200Z/
Marathon WI-
453 PM CDT Fri Apr 17 2026

...TORNADO WARNING WILL EXPIRE AT 5 PM CDT FOR SOUTHEASTERN MARATHON
COUNTY...

The Tornado Warning that was previously in effect has been reissued
for Marathon County and is in effect until 530 PM CDT. Please refer
to that bulletin for the latest severe weather information.

&&

LAT...LON 4478 8952 4485 8962 4489 8969 4499 8956
      4485 8938
TIME...MOT...LOC 2146Z 232DEG 28KT 4488 8952

$$

Kurimski

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 16, 8:36 PM CDT	Dense Fog Advisory	GRB	Brown, Calumet, Door, Forest, Kewaunee, Langlade and 9 more	12 hr
Apr 16, 8:37 PM CDT	Marine Dense Fog Advisory	GRB		31 hr
Apr 17, 2:56 AM CDT	Small Craft Advisory	GRB		31 hr
Apr 17, 2:53 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Wood	82 min
Apr 17, 3:00 PM CDT	Tornado Warning	GRB	Wood	60 min
Apr 17, 3:27 PM CDT	Severe Thunderstorm Warning	GRB	Wood	48 min
Apr 17, 3:40 PM CDT	Special Weather Statement	GRB	Lincoln	65 min
Apr 17, 3:52 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	53 min
Apr 17, 4:10 PM CDT	Flash Flood Warning	GRB	Marathon, Wood	5 hr
Apr 17, 4:11 PM CDT	Special Weather Statement	GRB	Winnebago	34 min
Apr 17, 4:19 PM CDT	Severe Thunderstorm Warning	GRB	Oneida	24 min
Apr 17, 4:36 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln	39 min
Apr 17, 4:44 PM CDT	Tornado Warning Tornado observed	GRB	Marathon	32 min
Apr 17, 4:48 PM CDT	Tornado Warning	GRB	Lincoln	21 min
Apr 17, 4:50 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln	30 min
Apr 17, 4:52 PM CDT	Tornado Warning	GRB	Langlade, Lincoln	30 min
Apr 17, 5:00 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Oneida	45 min
Apr 17, 5:06 PM CDT	Tornado Warning Tornado observed	GRB	Langlade, Marathon, Shawano	39 min
Apr 17, 5:14 PM CDT	Tornado Warning	GRB	Wood	61 min
Apr 17, 5:19 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Langlade, Oneida	18 min
Apr 17, 5:24 PM CDT	Special Weather Statement	GRB	Vilas	36 min
Apr 17, 5:27 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Marathon, Menominee, Portage, Shawano, Waupaca	37 min
Apr 17, 5:28 PM CDT	Tornado Warning	GRB	Vilas	17 min
Apr 17, 5:30 PM CDT	Tornado Warning	GRB	Langlade, Menominee	45 min
Apr 17, 5:48 PM CDT	Tornado Warning	GRB	Shawano	9 min
Apr 17, 5:58 PM CDT	Severe Thunderstorm Warning	GRB	Vilas	32 min
Apr 17, 6:06 PM CDT	Tornado Warning	GRB	Langlade, Oconto	28 min
Apr 17, 6:26 PM CDT	Special Weather Statement	GRB	Marathon, Portage, Wood	64 min
Apr 17, 6:43 PM CDT	Special Weather Statement	GRB	Oneida	32 min
Apr 17, 6:52 PM CDT	Flash Flood Warning	GRB	Langlade, Marathon, Menominee, Shawano	2 hr
Apr 17, 6:58 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	32 min

Nearby

Tornado Warnings in Wisconsin, 2026 Every tornado warning in 2026 Tornadoes 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.