Alert archive / Wisconsin / Tornado Warnings in 2026
Tornado Warning 3, NWS Milwaukee, WI
NWS Milwaukee, WI issued this tornado warning at Apr 2, 2026, 6:39 PM CDT for Jefferson County, Rock County, Walworth County, Wisconsin. It was in force for 30 min. 4 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 2, 2026, 6:39 PM CDT (23:39 UTC)
- Expired
- Apr 2, 2026, 7:09 PM CDT
- In force
- 30 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
Counties Jefferson County, WI, Rock County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 21 km from the middle of the area, began a volume at 23:40 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 2, 6:41 PM CDT | HAIL 2 | 2 W Whitewater, WI | |
| Apr 2, 6:57 PM CDT | TSTM WND DMG | 2 Wnw Palmyra, WI | Jefferson County Dispatch reports tree down on Power Line north of Palmyra. |
| Apr 2, 7:02 PM CDT | HAIL 1 | 2 W Whitewater, WI | Report from mPING: Quarter (1.00 in.). |
| Apr 2, 7:19 PM CDT | TSTM WND DMG | 1 Ssw Whitewater, WI | Walworth County Dispatch reports trees and powerlines down on northwest side of county as well as near Whitewater. Time estimated by radar. |
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 2, 1:43 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.7 hours before the alert went out and 302 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
- 19 J/kg
- Mixed-layer CIN
- -278 J/kg
- Mixed-layer LCL
- 846 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 453 m²/s²
- 0-3 km storm-relative helicity
- 450 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
731
WFUS53 KMKX 022339
TORMKX
WIC055-105-127-030045-
/O.NEW.KMKX.TO.W.0003.260402T2339Z-260403T0045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Milwaukee/Sullivan WI
639 PM CDT Thu Apr 2 2026
The National Weather Service in Milwaukee/Sullivan has issued a
* Tornado Warning for...
Northwestern Walworth County in southeastern Wisconsin...
Northeastern Rock County in south central Wisconsin...
Southeastern Jefferson County in southeastern Wisconsin...
* Until 745 PM CDT.
* At 639 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Whitewater, moving northeast at 35 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Weather spotters reported funnel cloud.
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 dangerous storm will be near...
Whitewater, Fort Atkinson, and Lake Koshkonong around 645 PM CDT.
Palmyra around 650 PM CDT.
Other locations impacted by this tornadic thunderstorm include Rome,
Sullivan, Hebron, Ixonia, Helenville, Lima Center, Nws
Milwaukee/sullivan, and Lake Lac La Belle.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid 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 4273 8888 4281 8899 4320 8854 4284 8854
TIME...MOT...LOC 2339Z 224DEG 32KT 4281 8883
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
$$
PATTERSON2 follow-up statements
167
WWUS53 KMKX 022354
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
654 PM CDT Thu Apr 2 2026
WIC105-127-030004-
/O.CAN.KMKX.TO.W.0003.000000T0000Z-260403T0045Z/
Walworth WI-Rock WI-
654 PM CDT Thu Apr 2 2026
...THE TORNADO WARNING FOR NORTHWESTERN WALWORTH AND NORTHEASTERN
ROCK COUNTIES IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CDT for south central
and southeastern Wisconsin.
&&
LAT...LON 4295 8881 4320 8854 4284 8854 4284 8881
TIME...MOT...LOC 2354Z 224DEG 32KT 4291 8870
$$
WIC055-030045-
/O.CON.KMKX.TO.W.0003.000000T0000Z-260403T0045Z/
Jefferson WI-
654 PM CDT Thu Apr 2 2026
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN JEFFERSON COUNTY...
At 654 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Whitewater, moving northeast at 35 mph.
HAZARD...Tornado and half dollar 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 dangerous storm will be near...
Palmyra around 700 PM CDT.
Other locations impacted by this tornadic thunderstorm include Rome,
Sullivan, Hebron, Ixonia, Helenville, Nws Milwaukee/sullivan, and
Lake Lac La Belle.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid 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 4295 8881 4320 8854 4284 8854 4284 8881
TIME...MOT...LOC 2354Z 224DEG 32KT 4291 8870
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
$$
PATTERSON080 WWUS53 KMKX 030009 SVSMKX Severe Weather Statement National Weather Service Milwaukee/Sullivan WI 709 PM CDT Thu Apr 2 2026 WIC055-030019- /O.CAN.KMKX.TO.W.0003.000000T0000Z-260403T0045Z/ Jefferson WI- 709 PM CDT Thu Apr 2 2026 ...THE TORNADO WARNING FOR SOUTHEASTERN JEFFERSON COUNTY IS CANCELLED... The storm which prompted the warning has moved out of the area. Therefore, the warning has been cancelled. A Tornado Watch remains in effect until 1100 PM CDT for south central and southeastern Wisconsin. && LAT...LON 4295 8881 4320 8854 4284 8854 4284 8881 TIME...MOT...LOC 0007Z 224DEG 32KT 4282 8885 $$ PATTERSON
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 11:46 AM CDT | River Flood Watch | MKX | Kenosha | 24 hr |
| Apr 2, 12:52 PM CDT | Marine Dense Fog Advisory | MKX | 6 hr | |
| Apr 2, 5:48 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 57 min |
| Apr 2, 5:58 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 47 min |
| Apr 2, 6:03 PM CDT | Tornado Warning | MKX | Jefferson, Rock | 42 min |
| Apr 2, 6:07 PM CDT | Tornado Warning | MKX | Rock | 38 min |
| Apr 2, 6:15 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 30 min |
| Apr 2, 6:35 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa | 40 min |
| Apr 2, 6:43 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Jefferson, Rock | 32 min |
| Apr 2, 6:58 PM CDT | Tornado Warning | MKX | Rock | 23 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.