Alert archive / Wisconsin / Flash Flood Warnings in 2026
Flash Flood Warning 21, NWS Milwaukee, WI
NWS Milwaukee, WI issued this flash flood warning at Sep 4, 2026, 5:56 AM CDT for Sheboygan County, Wisconsin. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2026, 5:56 AM CDT (10:56 UTC)
- Expired
- Sep 4, 2026, 9:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Flood severity
- None
County Sheboygan County, WI
The radar
The Green Bay radar (KGRB), 89 km from the middle of the area, began a volume at 10:59 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 nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 10.9 hours before the alert went out and 325 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
- 3157 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 1516 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.5
The text
As transmitted.
313
WGUS53 KMKX 041056
FFWMKX
WIC117-041400-
/O.NEW.KMKX.FF.W.0021.260904T1056Z-260904T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
556 AM CDT Fri Sep 4 2026
The National Weather Service in Milwaukee/Sullivan has issued a
* Flash Flood Warning for...
Northeastern Sheboygan County in east central Wisconsin...
* Until 900 AM CDT.
* At 556 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. The expected rainfall rate is 0.5 to 1.5 inches in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Sheboygan, Plymouth, Sheboygan Falls, Howards Grove, Oostburg,
Kohler, Elkhart Lake, Waldo, Glenbeulah, Johnsonville, Gibbsville
and Haven.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4361 8776 4366 8792 4374 8806 4389 8808
4389 8773 4382 8773 4380 8771 4379 8773
4379 8771 4378 8771 4374 8774 4375 8772
4374 8771 4375 8770 4373 8771 4371 8770
4371 8771 4370 8771 4370 8770 4369 8770
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Wood3 follow-up statements
761
WGUS73 KMKX 041151
FFSMKX
Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
651 AM CDT Fri Sep 4 2026
WIC117-041400-
/O.CON.KMKX.FF.W.0021.000000T0000Z-260904T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sheboygan WI-
651 AM CDT Fri Sep 4 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING
FOR NORTHEASTERN SHEBOYGAN COUNTY...
At 651 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. The expected rainfall rate is 0.5 to 1.5 inches in 1 hour.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Sheboygan, Plymouth, Sheboygan Falls, Howards Grove, Oostburg,
Kohler, Elkhart Lake, Waldo, Glenbeulah, Johnsonville, Gibbsville
and Haven.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4361 8776 4366 8792 4374 8806 4389 8808
4389 8773 4382 8773 4380 8771 4379 8773
4379 8771 4378 8771 4374 8774 4375 8772
4374 8771 4375 8770 4373 8771 4371 8770
4371 8771 4370 8771 4370 8770 4369 8770
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Wood924
WGUS73 KMKX 041256
FFSMKX
Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
756 AM CDT Fri Sep 4 2026
WIC117-041400-
/O.CON.KMKX.FF.W.0021.000000T0000Z-260904T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sheboygan WI-
756 AM CDT Fri Sep 4 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING
FOR NORTHEASTERN SHEBOYGAN COUNTY...
At 756 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. The expected rainfall rate is 0.5 to 1.5 inches in 1 hour.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Sheboygan, Plymouth, Sheboygan Falls, Howards Grove, Oostburg,
Kohler, Elkhart Lake, Waldo, Glenbeulah, Johnsonville, Gibbsville
and Haven.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4361 8776 4366 8792 4374 8806 4389 8808
4389 8773 4382 8773 4380 8771 4379 8773
4379 8771 4378 8771 4374 8774 4375 8772
4374 8771 4375 8770 4373 8771 4371 8770
4371 8771 4370 8771 4370 8770 4369 8770
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Wood719
WGUS73 KMKX 041353
FFSMKX
Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
853 AM CDT Fri Sep 4 2026
WIC117-041403-
/O.EXP.KMKX.FF.W.0021.000000T0000Z-260904T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sheboygan WI-
853 AM CDT Fri Sep 4 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 9 AM CDT THIS MORNING FOR
NORTHEASTERN SHEBOYGAN COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 4361 8776 4366 8792 4374 8806 4389 8808
4389 8773 4382 8773 4380 8771 4379 8773
4379 8771 4378 8771 4374 8774 4375 8772
4374 8771 4375 8770 4373 8771 4371 8770
4371 8771 4370 8771 4370 8770 4369 8770
$$
WoodThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 8:54 PM CDT | Special Weather Statement | MKX | Marquette | 51 min |
| Sep 3, 10:20 PM CDT | Special Weather Statement | MKX | Fond du Lac | 40 min |
| Sep 3, 10:25 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Green Lake | 35 min |
| Sep 3, 10:53 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Washington | 52 min |
| Sep 3, 11:23 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington | 67 min |
| Sep 3, 11:30 PM CDT | Areal Flood Advisory | MKX | Dodge, Fond du Lac, Washington | 2 hr |
| Sep 3, 11:45 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington | 30 min |
| Sep 4, 12:04 AM CDT | Severe Thunderstorm Warning | MKX | Dodge, Milwaukee, Ozaukee, Washington, Waukesha | 56 min |
| Sep 4, 12:28 AM CDT | Areal Flood Advisory | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 103 min |
| Sep 4, 12:33 AM CDT | Special Weather Statement | MKX | Fond du Lac | 42 min |
| Sep 4, 12:38 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac | 52 min |
| Sep 4, 12:50 AM CDT | Special Marine Warning | MKX | 85 min | |
| Sep 4, 12:54 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 51 min |
| Sep 4, 1:03 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 42 min |
| Sep 4, 1:11 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 49 min |
| Sep 4, 1:17 AM CDT | Special Marine Warning | MKX | 118 min | |
| Sep 4, 1:34 AM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 41 min |
| Sep 4, 1:40 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Green Lake, Marquette | 80 min |
| Sep 4, 2:11 AM CDT | Special Marine Warning | MKX | 64 min | |
| Sep 4, 2:14 AM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 16 min |
| Sep 4, 2:35 AM CDT | Areal Flood Advisory | MKX | Fond du Lac | 2 hr |
| Sep 4, 2:37 AM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Ozaukee, Sheboygan, Washington | 53 min |
| Sep 4, 3:08 AM CDT | Special Marine Warning | MKX | 97 min | |
| Sep 4, 5:29 AM CDT | Areal Flood Advisory | MKX | Sheboygan | 3 hr |
| Sep 4, 6:26 AM CDT | Areal Flood Advisory | MKX | Fond du Lac, Green Lake, Marquette | 3 hr |
| Sep 4, 7:40 AM CDT | Areal Flood Advisory | MKX | Fond du Lac | 2 hr |
| Sep 4, 8:25 AM CDT | Special Marine Warning | MKX | 65 min | |
| Sep 4, 9:24 AM CDT | Special Weather Statement | MKX | Dane | 51 min |
| Sep 4, 9:35 AM CDT | Special Weather Statement | MKX | Waukesha | 40 min |
| Sep 4, 10:39 AM CDT | Special Weather Statement | MKX | Milwaukee, Racine | 51 min |
| Sep 4, 10:41 AM CDT | Special Marine Warning | MKX | 33 min |
Nearby
Flash Flood Warnings in Wisconsin, 2026Every flash flood warning 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.