Alert archive / Wisconsin / Tornado Warnings in 2026

Tornado Warning 21, NWS Green Bay, WI

July 20, 2026Marathon County, Shawano County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 20, 2026, 8:06 PM CDT for Marathon County, Shawano County, Waupaca County, Wisconsin. It was in force for 54 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, 8:06 PM CDT (01:06 UTC)
Expired: Jul 20, 2026, 9:00 PM CDT
In force: 54 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Marathon County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 90 km from the middle of the area, began a volume at 01:05 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, 8:28 PM CDT	TORNADO	4 W Tigerton, WI	Storm chaser video.

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
Jul 20, 3:49 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 1.1 hours before the alert went out and 91 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

972 
WFUS53 KGRB 210106
TORGRB
WIC073-115-135-210200-
/O.NEW.KGRB.TO.W.0021.260721T0106Z-260721T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
806 PM CDT Mon Jul 20 2026

The National Weather Service in Green Bay has issued a

* Tornado Warning for...
  Southeastern Marathon County in central Wisconsin...
  Western Shawano County in northeastern Wisconsin...
  Northwestern Waupaca County in northeastern Wisconsin...

* Until 900 PM CDT.

* At 806 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Bevent, or 18 miles southeast of Wausau, 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...
  Bevent around 810 PM CDT. Wittenberg around 820 PM CDT.

Other locations impacted by the tornado include Pike Lake, Elderon,
Holt, Galloway, Whitcomb, Tigerton, Split Rock, Big Falls, Caroline
and Marion.

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 4477 8945 4487 8938 4476 8879 4452 8888
      4467 8922 4468 8922 4468 8925
TIME...MOT...LOC 0106Z 297DEG 26KT 4480 8936

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Kurimski

2 follow-up statements

950 
WWUS53 KGRB 210125
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
825 PM CDT Mon Jul 20 2026

WIC073-210135-
/O.CAN.KGRB.TO.W.0021.000000T0000Z-260721T0200Z/
Marathon WI-
825 PM CDT Mon Jul 20 2026

...TORNADO WARNING IS CANCELLED FOR SOUTHEASTERN MARATHON 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 central Wisconsin.

&&

LAT...LON 4468 8922 4484 8922 4476 8879 4452 8888
      4467 8922
TIME...MOT...LOC 0106Z 297DEG 26KT 4479 8935

$$


WIC115-135-210200-
/O.CON.KGRB.TO.W.0021.000000T0000Z-260721T0200Z/
Shawano WI-Waupaca WI-
825 PM CDT Mon Jul 20 2026

...TORNADO WARNING REMAINS IN EFFECT UNTIL 9 PM CDT FOR WESTERN
SHAWANO AND NORTHWESTERN WAUPACA COUNTIES...

At 825 PM CDT, a severe thunderstorm capable of producing a tornado
was located 5 miles south of Wittenberg, or 24 miles northeast of
Stevens Point, moving east 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...
  Wittenberg around 830 PM CDT.

Other locations impacted by the tornado include Whitcomb, Tigerton,
Split Rock, Big Falls, Marion, Caroline, Buckbee, Pella and Leopolis.

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 8922 4484 8922 4476 8879 4452 8888
      4467 8922
TIME...MOT...LOC 0106Z 289DEG 25KT 4479 8935

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Kurimski

273 
WWUS53 KGRB 210152
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
852 PM CDT Mon Jul 20 2026

WIC115-135-210202-
/O.EXP.KGRB.TO.W.0021.000000T0000Z-260721T0200Z/
Shawano WI-Waupaca WI-
852 PM CDT Mon Jul 20 2026

...TORNADO WARNING WILL EXPIRE AT 9 PM CDT FOR WESTERN SHAWANO AND
NORTHWESTERN WAUPACA COUNTIES...

The Tornado Warning that was previously in effect has been reissued
for Waupaca County and is in effect until 945 PM CDT. Please refer to
that bulletin for the latest severe weather information.

A Tornado Watch remains in effect until 1100 PM CDT Monday for a
portion of northeast Wisconsin.

&&

LAT...LON 4468 8922 4484 8922 4476 8879 4452 8888
      4467 8922
TIME...MOT...LOC 0125Z 289DEG 25KT 4475 8917

$$

Kurimski

The 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 Tornado observed	GRB	Marathon	39 min
Jul 20, 7:37 PM CDT	Tornado Warning	GRB	Marathon	38 min
Jul 20, 7:43 PM CDT	Tornado Warning	GRB	Langlade, Menominee, Shawano	47 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 Tornado observed	GRB	Marathon, Portage	41 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, 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.