Alert archive / Wisconsin / Tornado Warnings in 2026

Tornado Warning 41, NWS Milwaukee, WI

April 17, 2026Dane County, Dodge County, Jefferson County, Wisconsin

NWS Milwaukee, WI issued this tornado warning at Apr 17, 2026, 6:45 PM CDT for Dane County, Dodge County, Jefferson County, Wisconsin. It was in force for 13 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 17, 2026, 6:45 PM CDT (23:45 UTC)
Expired
Apr 17, 2026, 6:58 PM CDT
In force
13 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Dane County, WI, Dodge County, WI, Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 37 km from the middle of the area, began a volume at 23:49 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 17, 12:40 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 340 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2026-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 84 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2026-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
84 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
1053 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

050 
WFUS53 KMKX 172345
TORMKX
WIC025-027-055-180030-
/O.NEW.KMKX.TO.W.0041.260417T2345Z-260418T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Milwaukee/Sullivan WI
645 PM CDT Fri Apr 17 2026

The National Weather Service in Milwaukee/Sullivan has issued a

* Tornado Warning for...
  East central Dane County in south central Wisconsin...
  Northwestern Jefferson County in southeastern Wisconsin...
  Southwestern Dodge County in southeastern Wisconsin...

* Until 730 PM CDT.

* At 644 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Waterloo, 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 dangerous storm will be near...
  Waterloo around 650 PM CDT.
  Watertown around 655 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Lebanon, Hubbleton, Clyman, Reeseville, and Richwood.

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 4310 8905 4320 8909 4339 8867 4320 8854
TIME...MOT...LOC 2344Z 250DEG 26KT 4317 8900 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

HEEREN
2 follow-up statements
491 
WWUS53 KMKX 172355
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
655 PM CDT Fri Apr 17 2026

WIC025-180005-
/O.CAN.KMKX.TO.W.0041.000000T0000Z-260418T0030Z/
Dane WI-
655 PM CDT Fri Apr 17 2026

...THE TORNADO WARNING FOR EAST CENTRAL DANE COUNTY 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 southeastern
Wisconsin.

&&

LAT...LON 4315 8896 4324 8900 4339 8867 4320 8854
TIME...MOT...LOC 2355Z 250DEG 26KT 4320 8889 

$$

WIC027-055-180030-
/O.CON.KMKX.TO.W.0041.000000T0000Z-260418T0030Z/
Jefferson WI-Dodge WI-
655 PM CDT Fri Apr 17 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHWESTERN JEFFERSON AND SOUTHWESTERN DODGE COUNTIES...

At 655 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Waterloo, 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 dangerous storm will be near...
  Watertown around 700 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Lebanon, Hubbleton, Clyman, Reeseville, and Richwood.

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 4315 8896 4324 8900 4339 8867 4320 8854
TIME...MOT...LOC 2355Z 250DEG 26KT 4320 8889 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

HEEREN
850 
WWUS53 KMKX 172358
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
658 PM CDT Fri Apr 17 2026

WIC027-055-180008-
/O.CAN.KMKX.TO.W.0041.000000T0000Z-260418T0030Z/
Jefferson WI-Dodge WI-
658 PM CDT Fri Apr 17 2026

...THE TORNADO WARNING FOR NORTHWESTERN JEFFERSON AND SOUTHWESTERN
DODGE COUNTIES IS CANCELLED...

The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CDT for southeastern
Wisconsin.

&&

LAT...LON 4315 8896 4324 8900 4339 8867 4320 8854
TIME...MOT...LOC 2356Z 250DEG 26KT 4321 8886 

$$

HEEREN

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 9:55 PM CDTSmall Craft AdvisoryMKX48 hr
Apr 17, 10:40 AM CDTRiver Flood WatchMKXGreen Lake66 hr
Apr 17, 2:44 PM CDTSevere Thunderstorm WarningMKXSauk46 min
Apr 17, 2:58 PM CDTTornado WarningMKXSauk21 min
Apr 17, 3:06 PM CDTSpecial Weather StatementMKXColumbia39 min
Apr 17, 3:08 PM CDTSpecial Weather StatementMKXLafayette37 min
Apr 17, 3:12 PM CDTSevere Thunderstorm WarningMKXLafayette18 min
Apr 17, 3:17 PM CDTAreal Flood AdvisoryMKXLafayette43 min
Apr 17, 3:33 PM CDTSevere Thunderstorm WarningMKXGreen, Lafayette42 min
Apr 17, 3:39 PM CDTSevere Thunderstorm WarningMKXLafayette40 min
Apr 17, 4:00 PM CDTFlash Flood WarningMKXLafayette3 hr
Apr 17, 4:03 PM CDTTornado WarningMKXGreen42 min
Apr 17, 4:07 PM CDTSevere Thunderstorm WarningMKXDane, Green, Iowa, Lafayette38 min
Apr 17, 4:16 PM CDTSevere Thunderstorm WarningMKXGreen, Lafayette29 min
Apr 17, 4:24 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Green Lake, Iowa, Sauk66 min
Apr 17, 4:25 PM CDTSevere Thunderstorm WarningMKXRock65 min
Apr 17, 4:27 PM CDTAreal Flood AdvisoryMKXDane, Green, Lafayette, Rock3 hr
Apr 17, 4:27 PM CDTTornado WarningMKXDodge13 min
Apr 17, 4:32 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson43 min
Apr 17, 4:37 PM CDTSevere Thunderstorm WarningMKXIowa38 min
Apr 17, 4:40 PM CDTSevere Thunderstorm WarningMKXDane, Green, Rock50 min
Apr 17, 4:47 PM CDTSevere Thunderstorm WarningMKXDane, Green, Iowa, Lafayette22 min
Apr 17, 4:52 PM CDTAreal Flood AdvisoryMKXDane, Iowa3 hr
Apr 17, 5:09 PM CDTSevere Thunderstorm WarningMKXDane36 min
Apr 17, 5:09 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXIowa51 min
Apr 17, 5:12 PM CDTTornado WarningMKXRock48 min
Apr 17, 5:15 PM CDTFlash Flood WarningMKXGreen, Lafayette4 hr
Apr 17, 5:16 PM CDTSevere Thunderstorm WarningMKXDodge, Jefferson59 min
Apr 17, 5:19 PM CDTFlash Flood WarningMKXIowa3 hr
Apr 17, 5:19 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXDane41 min
Apr 17, 5:25 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXDane, Green, Jefferson, Rock, Walworth, Waukesha65 min
Apr 17, 5:33 PM CDTSevere Thunderstorm Warning Destructive damage threatMKXRock, Walworth42 min
Apr 17, 5:34 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXLafayette41 min
Apr 17, 5:38 PM CDTTornado WarningMKXRock52 min
Apr 17, 5:46 PM CDTAreal Flood AdvisoryMKXRock, Walworth5 hr
Apr 17, 5:48 PM CDTSevere Thunderstorm WarningMKXFond du Lac, Sheboygan, Washington42 min
Apr 17, 5:54 PM CDTAreal Flood AdvisoryMKXColumbia, Dane, Dodge, Jefferson, Washington3 hr
Apr 17, 5:54 PM CDTSevere Thunderstorm WarningMKXDodge, Washington51 min
Apr 17, 5:54 PM CDTSevere Thunderstorm WarningMKXDane, Green, Iowa38 min
Apr 17, 6:05 PM CDTTornado WarningMKXDane40 min
Apr 17, 6:05 PM CDTTornado Warning Tornado observedMKXJefferson, Rock, Waukesha25 min
Apr 17, 6:08 PM CDTFlash Flood WarningMKXGreen, Rock3 hr
Apr 17, 6:09 PM CDTSpecial Marine WarningMKX3 hr
Apr 17, 6:17 PM CDTTornado WarningMKXWalworth28 min
Apr 17, 6:24 PM CDTSevere Thunderstorm WarningMKXDane, Green, Jefferson, Rock32 min
Apr 17, 6:26 PM CDTSevere Thunderstorm Warning Considerable damage threatMKXDane, Jefferson, Rock, Walworth, Waukesha64 min
Apr 17, 6:28 PM CDTSevere Thunderstorm WarningMKXGreen28 min
Apr 17, 6:30 PM CDTTornado WarningMKXRock14 min
Apr 17, 6:33 PM CDTSpecial Weather StatementMKXOzaukee, Sheboygan, Washington57 min
Apr 17, 6:34 PM CDTFlash Flood Warning Considerable damage threatMKXRock3 hr
Apr 17, 6:37 PM CDTAreal Flood AdvisoryMKXDodge, Fond du Lac, Sheboygan, Washington3 hr
Apr 17, 6:39 PM CDTSevere Thunderstorm WarningMKXFond du Lac, Ozaukee, Sheboygan, Washington51 min
Apr 17, 6:40 PM CDTTornado WarningMKXWalworth35 min
Apr 17, 6:47 PM CDTAreal Flood AdvisoryMKXDane, Jefferson, Milwaukee, Racine, Waukesha3 hr
Apr 17, 6:51 PM CDTTornado WarningMKXWalworth24 min
Apr 17, 6:52 PM CDTSpecial Marine WarningMKX3 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.