Alert archive / Wisconsin / Tornado Warnings in 2026
Tornado Warning 26, NWS Green Bay, WI
NWS Green Bay, WI issued this tornado warning at Aug 18, 2026, 4:11 PM CDT for Waushara County, Wisconsin. It was in force for 30 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
- Aug 18, 2026, 4:11 PM CDT (21:11 UTC)
- Expired
- Aug 18, 2026, 4:41 PM CDT
- In force
- 30 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
County Waushara County, WI
The radar
The Green Bay radar (KGRB), 105 km from the middle of the area, began a volume at 21:11 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 |
|---|---|---|---|
| Aug 18, 4:14 PM CDT | TSTM WND GST 53 | 3 Ssw Wautoma, WI | AWOS station KY50 Wautoma Airport. This corrects the previous thunderstorm wind gust report from Wautoma. |
| Aug 18, 4:14 PM CDT | TSTM WND GST 53 | Wautoma, WI | |
| Aug 18, 4:15 PM CDT | TSTM WND GST 61 | 3.4 Ne Richford, WI | From private weather station. |
| Aug 18, 4:19 PM CDT | TSTM WND DMG | 1 S Wautoma, WI | Powerlines downed in Wautoma. Time estimated by radar. |
| Aug 18, 4:26 PM CDT | HAIL 0.75 | 1 N Silver Lake, WI | Report from mPING: Dime (0.75 in.). |
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 |
|---|---|---|---|
| Aug 18, 2:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 9.2 hours before the alert went out and 358 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
- 1301 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 956 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted.
017
WFUS53 KGRB 182111
TORGRB
WIC137-182200-
/O.NEW.KGRB.TO.W.0026.260818T2111Z-260818T2200Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
411 PM CDT Tue Aug 18 2026
The National Weather Service in Green Bay has issued a
* Tornado Warning for...
Southeastern Waushara County in central Wisconsin...
* Until 500 PM CDT.
* At 411 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wautoma, moving southeast at 35 mph.
HAZARD...Tornado and ping pong ball 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...
Wautoma around 415 PM CDT.
Redgranite around 430 PM CDT.
Other locations impacted by the tornado include Dakota, Richford,
Silver Lake, Spring Lake, Lohrville and Auroraville.
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 4400 8945 4413 8939 4403 8889 4398 8889
4398 8939
TIME...MOT...LOC 2110Z 293DEG 30KT 4406 8937
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
Kurimski3 follow-up statements
003
WWUS53 KGRB 182121
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
421 PM CDT Tue Aug 18 2026
WIC137-182200-
/O.CON.KGRB.TO.W.0026.000000T0000Z-260818T2200Z/
Waushara WI-
421 PM CDT Tue Aug 18 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 5 PM CDT FOR SOUTHEASTERN
WAUSHARA COUNTY...
At 421 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wautoma, moving southeast at 35 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Wautoma around 425 PM CDT.
Redgranite around 430 PM CDT.
Other locations impacted by the tornado include Spring Lake, Silver
Lake, Dakota, Lohrville and Auroraville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4398 8939 4410 8924 4403 8889 4398 8889
TIME...MOT...LOC 2111Z 296DEG 31KT 4405 8935
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
Kurimski578
WWUS53 KGRB 182134
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
434 PM CDT Tue Aug 18 2026
WIC137-182200-
/O.CON.KGRB.TO.W.0026.000000T0000Z-260818T2200Z/
Waushara WI-
434 PM CDT Tue Aug 18 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 5 PM CDT FOR SOUTH CENTRAL
WAUSHARA COUNTY...
At 434 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Redgranite, or 10 miles southeast of Wautoma, moving
southeast at 55 mph.
HAZARD...Tornado and ping pong ball 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.
Locations impacted include...
Redgranite, Spring Lake and Lohrville.
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 4398 8930 4408 8918 4398 8890 4398 8912
TIME...MOT...LOC 2121Z 297DEG 48KT 4406 8933
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
$$
Kurimski460 WWUS53 KGRB 182141 SVSGRB Severe Weather Statement National Weather Service Green Bay WI 441 PM CDT Tue Aug 18 2026 WIC137-182151- /O.CAN.KGRB.TO.W.0026.000000T0000Z-260818T2200Z/ Waushara WI- 441 PM CDT Tue Aug 18 2026 ...TORNADO WARNING IS CANCELLED FOR SOUTH CENTRAL WAUSHARA COUNTY... The storm which prompted the warning has moved out of the area. Therefore, the warning has been cancelled. However, heavy rain is still possible with this thunderstorm. A Severe Thunderstorm Watch remains in effect until 1000 PM CDT Tuesday for a portion of central Wisconsin. && LAT...LON 4398 8930 4408 8918 4398 8890 4398 8912 TIME...MOT...LOC 2134Z 297DEG 48KT 4398 8912 $$ Kurimski
The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 2:44 PM CDT | Severe Thunderstorm Warning | GRB | Marinette | 33 min |
| Aug 18, 2:45 PM CDT | Special Marine Warning | GRB | 101 min | |
| Aug 18, 3:03 PM CDT | Special Weather Statement | GRB | Marinette | 27 min |
| Aug 18, 3:22 PM CDT | Special Weather Statement | GRB | Portage | 38 min |
| Aug 18, 3:34 PM CDT | Special Weather Statement | GRB | Marinette | 26 min |
| Aug 18, 3:50 PM CDT | Special Weather Statement | GRB | Door | 25 min |
| Aug 18, 3:55 PM CDT | Severe Thunderstorm Warning | GRB | Waushara | 49 min |
| Aug 18, 4:28 PM CDT | Special Weather Statement | GRB | Door | 47 min |
| Aug 18, 5:04 PM CDT | Special Marine Warning | GRB | 56 min | |
| Aug 18, 5:07 PM CDT | Special Marine Warning | GRB | 83 min |
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.