Alert archive / Wisconsin / River Flood Warnings in 2026

River Flood Warning 17, NWS Milwaukee, WI

April 15, 2026Jefferson County, Wisconsin

NWS Milwaukee, WI issued this river flood warning at Apr 15, 2026, 11:51 AM CDT for Jefferson County, Wisconsin. It was in force for 21 days.

The area

The counties it named.

The facts

Issued: Apr 15, 2026, 11:51 AM CDT (16:51 UTC)
Expired: May 6, 2026, 11:51 AM CDT
In force: 21 days
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Flood severity: Major

County Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 19 km from the middle of the area, began a volume at 16:53 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 river

Written for the forecast point Rock River at Watertown (WATW3). The gauge peaked at 5.83 ft at Apr 15, 2026, 10:00 AM CDT.

Action stage: 4 ft
Minor stage: 5.5 ft
Moderate stage: 6 ft
Major stage: 6.5 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05425500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Milwaukee, WI wrote its last area forecast discussion before this river flood warning went out at Apr 15, 6:57 AM CDT, 4 hours 54 minutes earlier.

Area forecast discussion, Apr 15, 6:57 AM CDT, 4 hours 54 minutes before

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Hazardous weather outlook, Apr 14, 11:24 PM CDT, 12 hours 27 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Milwaukee/Sullivan WI
1124 PM CDT Tue Apr 14 2026

WIZ046-047-051-052-056>060-062>072-160430-
Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
1124 PM CDT Tue Apr 14 2026

This Hazardous Weather Outlook is for portions of east central
Wisconsin, south central Wisconsin and southeast Wisconsin.

.DAY ONE...Tonight

Scattered showers and thunderstorms will continue into the
overnight hours. Small hail, cloud to ground lightning and
locally heavy rainfall are expected. There is a localized flash
flood threat where thunderstorms move slow.

.DAYS TWO THROUGH SEVEN...Wednesday through Tuesday

There is yet another risk of severe thunderstorms from mid
afternoon Wednesday into Wednesday evening. Localized damaging
winds, hail to the size of one inch and cloud to ground lightning
are expected. Additional heavy rain will maintain a flooding risk
across the area. Keep up with the latest forecast updates.

There is a chance for isolated thunderstorms Thursday. Another
round of potentially severe thunderstorms is expected from late
Friday afternoon through Friday evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Wednesday.

LMZ643>646-160430-
Sheboygan to Port Washington WI-
Port Washington to North Point Light WI-
North Point Light to Wind Point WI-
Wind Point WI to Winthrop Harbor IL-
1124 PM CDT Tue Apr 14 2026

This Hazardous Weather Outlook is for the nearshore waters from
Sheboygan Wisconsin to Winthrop Harbor Illinois.

.DAY ONE...Tonight

Dense fog continues mainly north of Milwaukee through tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Tuesday

Chances for thunderstorms continue through the end of the week,
with some strong to severe storms possible Wednesday and Friday
evening.

Fog will continue into Wednesday morning.

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-160430-
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to
mid-line of lake.-
Lake Michigan from Seul Choix Point to Rock Island Passage 5NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and North of a line from Charlevoix MI to South
Fox Island 5NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to
mid lake-
Lake Michigan from Point Betsie to Manistee MI 5NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM
offshore to mid lake-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid
Lake-
Lake Michigan from Sheboygan to Port Washington WI 5NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor to Michigan City in 5NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5NM offshore to Mid
lake-
Lake Michigan from St Joseph to South Haven MI 5NM offshore to
Mid Lake-
1124 PM CDT Tue Apr 14 2026

This Hazardous Weather Outlook is for the open waters of Lake
Michigan.

.DAY ONE...Tonight

Dense fog continues for the northern two thirds of Lake Michigan
the rest of tonight.

Scattered thunderstorms will continue over the far southern
portion of the lake through the overnight hours.

.DAYS TWO THROUGH SEVEN...Wednesday through Tuesday

Chances for thunderstorms continue through the end of the week,
with some strong to severe storms possible Wednesday and Friday
evening.

Fog will continue into Wednesday morning.

www.weather.gov/mkx

In the hours before

Local storm report, Apr 15, 7:46 AM CDT, 4 hours 5 minutes before

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Local storm report, Apr 15, 7:50 AM CDT, 4 hours 1 minute before

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Local storm report, Apr 15, 7:52 AM CDT, 3 hours 59 minutes before

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Local storm report, Apr 15, 7:53 AM CDT, 3 hours 58 minutes before

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Local storm report, Apr 15, 7:55 AM CDT, 3 hours 56 minutes before

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Local storm report, Apr 15, 8:04 AM CDT, 3 hours 47 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 7:00 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Green Lake	30 min
Apr 14, 7:05 PM CDT	Tornado Warning	MKX	Iowa, Lafayette	25 min
Apr 14, 7:10 PM CDT	Flash Flood Warning	MKX	Dodge, Milwaukee, Ozaukee, Washington, Waukesha	3 hr
Apr 14, 7:21 PM CDT	Severe Thunderstorm Warning	MKX	Green, Rock	24 min
Apr 14, 7:23 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane	22 min
Apr 14, 7:25 PM CDT	Areal Flood Advisory	MKX	Dane, Iowa	3 hr
Apr 14, 7:26 PM CDT	Areal Flood Advisory	MKX	Fond du Lac, Green Lake	3 hr
Apr 14, 7:28 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Jefferson	62 min
Apr 14, 7:39 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Green, Rock	51 min
Apr 14, 7:58 PM CDT	Flash Flood Warning	MKX	Milwaukee, Waukesha	3 hr
Apr 14, 7:59 PM CDT	Severe Thunderstorm Warning	MKX	Walworth	61 min
Apr 14, 8:00 PM CDT	Special Marine Warning	MKX		2 hr
Apr 14, 8:18 PM CDT	Tornado Warning	MKX	Jefferson, Waukesha	21 min
Apr 14, 8:24 PM CDT	Tornado Warning	MKX	Walworth	23 min
Apr 14, 8:30 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine	49 min
Apr 14, 8:35 PM CDT	Tornado Warning	MKX	Racine	33 min
Apr 14, 8:57 PM CDT	Tornado Warning	MKX	Kenosha	17 min
Apr 14, 9:12 PM CDT	Special Weather Statement	MKX	Sauk	33 min
Apr 14, 10:02 PM CDT	Areal Flood Advisory	MKX	Dane, Dodge, Jefferson, Ozaukee, Washington, Waukesha	3 hr
Apr 14, 10:13 PM CDT	River Flood Warning	MKX	Dodge	21 days
Apr 14, 10:14 PM CDT	Special Weather Statement	MKX	Marquette	16 min
Apr 14, 10:33 PM CDT	Areal Flood Advisory	MKX	Green, Lafayette	3 hr
Apr 14, 10:57 PM CDT	Areal Flood Advisory	MKX	Kenosha, Milwaukee, Racine, Waukesha	3 hr
Apr 14, 10:59 PM CDT	Areal Flood Advisory	MKX	Green, Rock, Walworth	3 hr
Apr 14, 11:02 PM CDT	Special Weather Statement	MKX	Sauk	43 min
Apr 14, 11:21 PM CDT	Areal Flood Advisory	MKX	Green, Rock	3 hr
Apr 14, 11:25 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Green Lake, Marquette, Sauk	33 min
Apr 15, 3:00 AM CDT	Severe Thunderstorm Warning	MKX	Walworth	30 min
Apr 15, 3:23 AM CDT	Dense Fog Advisory	MKX	Columbia, Fond du Lac, Green Lake, Marquette, Sauk	7 hr
Apr 15, 3:25 AM CDT	Special Weather Statement	MKX	Kenosha	50 min
Apr 15, 4:22 AM CDT	River Flood Watch	MKX	Jefferson	21 days
Apr 15, 4:22 AM CDT	River Flood Watch	MKX	Jefferson	40 hr
Apr 15, 4:23 AM CDT	River Flood Watch	MKX	Rock	21 days
Apr 15, 4:24 AM CDT	River Flood Watch	MKX	Green Lake	40 hr
Apr 15, 10:50 AM CDT	River Flood Warning	MKX	Kenosha	15 days
Apr 15, 11:17 AM CDT	Flood Watch	MKX	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	24 hr
Apr 15, 11:19 AM CDT	River Flood Watch	MKX	Waukesha	3 days
Apr 15, 11:22 AM CDT	River Flood Warning	MKX	Ozaukee	5 days
Apr 15, 4:49 PM CDT	Special Weather Statement	MKX	Iowa, Sauk	56 min
Apr 15, 5:29 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	46 min
Apr 15, 5:56 PM CDT	River Flood Watch	MKX	Jefferson	21 days
Apr 15, 6:07 PM CDT	Special Weather Statement	MKX	Iowa	38 min
Apr 15, 6:23 PM CDT	Severe Thunderstorm Warning	MKX	Green, Lafayette	52 min
Apr 15, 6:29 PM CDT	Tornado Warning	MKX	Green, Lafayette	46 min
Apr 15, 6:44 PM CDT	Special Weather Statement	MKX	Dane	31 min

Nearby

River Flood Warnings in Wisconsin, 2026 Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.