Alert archive / Wisconsin / Flash Flood Warnings in 2025

Flash Flood Warning 10, NWS Milwaukee, WI

August 9, 2025Milwaukee County, Waukesha County, Wisconsin

NWS Milwaukee, WI issued this flash flood warning at Aug 9, 2025, 8:04 PM CDT for Milwaukee County, Waukesha County, Wisconsin. It was in force for 6 hr. 18 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 9, 2025, 8:04 PM CDT (01:04 UTC)
Expired
Aug 10, 2025, 2:00 AM CDT
In force
6 hr
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Flood severity
None

Counties Milwaukee County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 53 km from the middle of the area, began a volume at 01:05 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

TimeReportWhereRemark
Aug 9, 8:52 PM CDTFLASH FLOOD1 Ne West Allis, WIWater reported up to the bottom of car doors.
Aug 9, 9:30 PM CDTRAIN 3.41 N Greenfield, WIDelayed Report: From 7pm to 9:30pm, measured 3.40 inches with gauge. Trained Spotter.
Aug 9, 11:30 PM CDTRAIN 3.932 W Milwaukee, WITrained spotter reports daily total of 3.93 inches near 27th and Highland BLVD in Milwaukee, measured 11:30 PM.
Aug 9, 11:50 PM CDTRAIN 3.924 Nw Milwaukee, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 4.283 S Milwaukee, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 4.381 Sse Milwaukee, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 4.832 Nne Brookfield, WI
Aug 9, 11:50 PM CDTRAIN 4.841 W Hales Corners, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 4.982 Nne West Allis, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 5.141 Se Elm Grove, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 5.211 Ssw Glendale, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 5.861 N Glendale, WIMMSD Gauge between Fox Point and Glendale. Daily total measurement, taken 1150 PM.
Aug 9, 11:50 PM CDTRAIN 5.992 Ssw West Allis, WIMMSD Gauge. Daily total measurement, taken 1150 PM.
Aug 10, 12:00 AM CDTRAIN 5.77New Berlin, WINew Berlin Wisconet site storm total.
Aug 10, 12:07 AM CDTFLASH FLOOD2 Sw Wauwatosa, WIFlooding at 113th St and Watertown Plank Rd Wauwatosa, photos on X depict cars stalled / stranded / abandoned in flooded roadways.
Aug 10, 12:19 AM CDTFLASH FLOODNew Berlin, WILots of street flooding in New Berlin area with cars stuck in the water.
Aug 10, 1:10 AM CDTFLASH FLOOD2 Se New Berlin, WINumerous local news channels with footage of flooded roadways near I-43 and Moorland Rd intersection. Reports of stranded vehicles across the area.
Aug 10, 2:09 AM CDTRAIN 10.163 N Butler, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 4 storm reports to this flash flood warning; the first came 48 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 1.1 hours before the alert went out and 165 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, Green Bay/Straub, WI at 00:00Z on 2025-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 42 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2025-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 168 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
42 J/kg
Mixed-layer CIN
-349 J/kg
Mixed-layer LCL
1159 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
168 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

000 
WGUS53 KMKX 100104
FFWMKX
WIC079-133-100700-
/O.NEW.KMKX.FF.W.0010.250810T0104Z-250810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Milwaukee/Sullivan WI
804 PM CDT Sat Aug 9 2025

The National Weather Service in Milwaukee/Sullivan has issued a

* Flash Flood Warning for...
  Milwaukee County in southeastern Wisconsin...
  Eastern Waukesha County in southeastern Wisconsin...

* Until 200 AM CDT.

* At 804 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have fallen. The expected rainfall rate is 1 to 2 inches per 
  hour. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Milwaukee, West Allis, Wauwatosa, New Berlin, Brookfield, 
  Greenfield, Menomonee Falls, Oak Creek, Muskego, South Milwaukee, 
  Cudahy, Whitefish Bay, Greendale, Brown Deer, St. Francis, Hales 
  Corners, Fox Point, Elm Grove, West Milwaukee and Franklin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4315 8789 4313 8790 4307 8786 4305 8788
      4304 8790 4303 8790 4300 8789 4298 8786
      4296 8785 4293 8785 4291 8784 4289 8785
      4288 8785 4284 8783 4284 8815 4316 8814

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

BOXELL
3 follow-up statements
069 
WGUS73 KMKX 100212
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
912 PM CDT Sat Aug 9 2025

WIC079-133-100700-
/O.CON.KMKX.FF.W.0010.000000T0000Z-250810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Milwaukee WI-Waukesha WI-
912 PM CDT Sat Aug 9 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR 
MILWAUKEE AND EASTERN WAUKESHA COUNTIES...

At 912 PM CDT, local law enforcement reported thunderstorms 
producing heavy rain and flooding of some roadways in central 
Milwaukee County. The two right lanes on Wisconsin 175 North at I-94 
are closed. Between 2 and 3.5 inches of rain have fallen. Additional 
rainfall amounts of 1 to 2 inches are possible in the warned area. 
Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  Milwaukee, West Allis, Wauwatosa, New Berlin, Brookfield, 
  Greenfield, Menomonee Falls, Oak Creek, Muskego, South Milwaukee, 
  Cudahy, Whitefish Bay, Greendale, Brown Deer, St. Francis, Hales 
  Corners, Fox Point, Elm Grove, West Milwaukee and Franklin.

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 4315 8789 4313 8790 4307 8786 4305 8788
      4304 8790 4303 8790 4300 8789 4298 8786
      4296 8785 4293 8785 4291 8784 4289 8785
      4288 8785 4284 8783 4284 8815 4316 8814

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

GEHRING
405 
WGUS73 KMKX 100328
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1028 PM CDT Sat Aug 9 2025

WIC079-133-100700-
/O.CON.KMKX.FF.W.0010.000000T0000Z-250810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Milwaukee WI-Waukesha WI-
1028 PM CDT Sat Aug 9 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR 
MILWAUKEE AND EASTERN WAUKESHA COUNTIES...

At 1028 PM CDT, Doppler radar, automated rain gauges, and DOT 
cameras indicated thunderstorms producing heavy rain.  Street 
flooding and significant ponding of water on some roadways in 
northern and central Milwaukee County. Between 2 and 4 inches of 
rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

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...
  Milwaukee, West Allis, Wauwatosa, New Berlin, Brookfield, 
  Greenfield, Menomonee Falls, Oak Creek, Muskego, South Milwaukee, 
  Cudahy, Whitefish Bay, Greendale, Brown Deer, St. Francis, Hales 
  Corners, Fox Point, Elm Grove, West Milwaukee and Franklin.

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 4315 8789 4313 8790 4307 8786 4305 8788
      4304 8790 4303 8790 4300 8789 4298 8786
      4296 8785 4293 8785 4291 8784 4289 8785
      4288 8785 4284 8783 4284 8815 4316 8814

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

GEHRING
038 
WGUS73 KMKX 100526
FFSMKX

Flash Flood Statement
National Weather Service Milwaukee/Sullivan WI
1226 AM CDT Sun Aug 10 2025

WIC079-133-100700-
/O.CON.KMKX.FF.W.0010.000000T0000Z-250810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Milwaukee WI-Waukesha WI-
1226 AM CDT Sun Aug 10 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT EARLY THIS 
MORNING FOR MILWAUKEE AND EASTERN WAUKESHA COUNTIES...

At 1226 AM CDT, Doppler radar and local law enforcement reported 
thunderstorms producing heavy rain. Street flooding and basement 
flooding over eastern Waukesha County into Milwaukee County 
continues. Some vehicles stranded in New Berlin. Between 3 and 5 
inches of rain have fallen. Additional rainfall amounts of 1 to 2 
inches are possible in the warned area. Flash flooding is already 
occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  Milwaukee, West Allis, Wauwatosa, New Berlin, Brookfield, 
  Greenfield, Menomonee Falls, Oak Creek, Muskego, South Milwaukee, 
  Cudahy, Whitefish Bay, Greendale, Brown Deer, St. Francis, Hales 
  Corners, Fox Point, Elm Grove, West Milwaukee and Franklin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4315 8789 4313 8790 4307 8786 4305 8788
      4304 8790 4303 8790 4300 8789 4298 8786
      4296 8785 4293 8785 4291 8784 4289 8785
      4288 8785 4284 8783 4284 8815 4316 8814

FLASH FLOOD...OBSERVED

$$

GEHRING

What forecasters said that day

The local office's own words before this flash 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 flash flood warning went out at Aug 9, 3:01 PM CDT, 5 hours 3 minutes earlier. Its key messages:

  • Showers and storms expected across the area this afternoon/evening, with additional development possible after midnight. A few storms could be strong with damaging winds through this evening, with torrential downpours accompanying all storms.
  • Additional periods of storms expected Sunday afternoon into Monday, posing additional heavy rainfall potential. A Flood Watch remains in effect through 7 AM Monday morning for areas northwest of Milwaukee.
  • Hot and humid through the rest of this afternoon, with heat indices in the upper 90s to near 100 over southeast Wisconsin.
  • High swimming risk continues into this evening at all Lake Michigan beaches.&&
Area forecast discussion, Aug 9, 3:01 PM CDT, 5 hours 3 minutes before
Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
301 PM CDT Sat Aug 9 2025

.KEY MESSAGES...

- Showers and storms expected across the area this
afternoon/evening, with additional development possible after
midnight. A few storms could be strong with damaging winds through
this evening, with torrential downpours accompanying all storms.

- Additional periods of storms expected Sunday afternoon into
Monday, posing additional heavy rainfall potential. A Flood Watch
remains in effect through 7 AM Monday morning for areas northwest of
Milwaukee.

- Hot and humid through the rest of this afternoon, with heat
indices in the upper 90s to near 100 over southeast Wisconsin.

- High swimming risk continues into this evening at all Lake
  Michigan beaches.&&

.SHORT TERM...
Issued 300 PM CDT Sat Aug 9 2025

Tonight through Sunday night:

Synopsis/Mesoanalysis: A weak surface boundary is working into
southern Wisconsin this afternoon, encouraging shower and storm
development from the Madison metro north into the Fox River Valley.
Lift from the surface boundary is being further supported by subtle
MCV extending from central Wisconsin into the Wisconsin River
Valley, with an additional MCV apparent over the Waterloo, IA
vicinity. Expect shower and storm activity to continue sagging south
and east with the surface boundary through the remainder of the
afternoon, with additional storm development anticipated this
evening as the Waterloo MCV tracks into southern Wisconsin. An
isolated strong to severe storm is possible in this activity, with
damaging winds being the primary concern. A brief lull may follow
the evening activity, with additional storm development anticipated
after midnight as the low level jet ramps up. Torrential downpours
will be possible in this evening's & overnight's storms, which could
lead to hydro impacts across the area, with the greatest potential
for impacts (particularly any flash flooding) in areas experiencing
multiple rounds of storms. Additional storm development is
anticipated Sunday afternoon into Monday morning, with development
corridors being highly dependent on MCV's & where the progressing
surface boundary settles following tonight's convection. Additional
torrential downpours and flooding potential will exist in these
storms, with potential once more being maximized in areas of
training. A Flood Watch remains in effect through 7 AM Monday to the
northwest of the Milwaukee metro, where training potential will be
greatest.

Rest Of This Afternoon & Tonight: Heat and humidity will continue,
with heat indices in the upper 90s over southeastern Wisconsin. A
few spots will briefly climb to the 100 degree mark over this part
of the area. A high swimming risk continues through the first part
of this evening at Ozaukee and Sheboygan County beaches, with a
moderate swimming risk further south. Exercise extreme caution if
heading lakeside through this evening.

Quigley

&&

.LONG TERM...
Issued 300 PM CDT Sat Aug 9 2025

Monday through Saturday:

Synopsis: The surface boundary at the center of the short term's
shower and storm chances will linger across southern Wisconsin
during the Monday-Tuesday timeframe, supporting additional periods
of showers and thunderstorms. Much like in the short term period,
weak wind shear should keep severe potential lower in any Monday-
Tuesday activity, though a still very humid air mass will support
additional torrential downpour potential (particularly on Monday).
Additional hydrologic impacts are thus possible in early week
thunderstorms, particularly in regions experiencing repeated rounds
of heavy rainfall. What's left of the surface boundary will push
east of the region Tuesday night, resulting in a brief period of
west-northwest winds & slightly less humid conditions through
Wednesday. The briefly lower humidity will be short-lived, as re-
establishing south-southeasterly winds will push dew points upward
Wednesday night through Saturday. Additional periods of showers and
storms return to the forecast during this time period as
temperatures gradually trend upward.

Monday through Tuesday: With a surface boundary still draped across
the area, additional periods of showers and embedded storms are
forecast. Chances for storms are overall higher Monday relative to
Tuesday (~40-60% Monday compared to ~15-30% Tuesday), with activity
expected to shutdown entirely by Tuesday night as the responsible
boundary pushes east of the region. Shear will remain weak through
the entirety of this time frame, making severe potential overall low
in any storm development. Still elevated humidity & precipitable
waters pooled along the surface boundary, however, will support the
continued possibility for heavy downpours. Could thus continue to
see more minor hydro impacts (urban/small stream flooding, small
rises on area rivers/creeks) through Tuesday afternoon. Have
maintained the 12Z Monday end time of the Flood Watch in this
forecast, but will continue to monitor trends in the coming
updates.

Quigley

&&

.AVIATION...
Issued 300 PM CDT Sat Aug 9 2025

VFR conditions continue into this afternoon at all southern
Wisconsin terminals. Already reflected in current observations,
southerly winds will become gusty through early evening. SHRA and
TSRA development remains likely this afternoon and evening as a
surface front slowly sags into southern Wisconsin. Have continued
prevailing mentions at all terminals in the 15Z update, and will
continue to monitor timing trends. Precip will be accompanied by
reduced VIS readings, which will result in temporary reductions in
flight categories. Periods of SHRA & TSRA will continue into the
overnight hours, with CIGs gradually lowering approaching daybreak
on Sunday.

Quigley

&&

.MARINE...
Issued 300 PM CDT Sat Aug 9 2025

1002 mb low pressure will linger across Manitoba into this evening,
with 1024 mb high pressure remaining centered over the Mid-Atlantic
states. Placed between the two surface features, breezy southerly
winds will continue across the open waters through the first half of
tonight. Prevailing southerlies will gradually decrease after
midnight as the aforementioned surface high migrates east into the
Atlantic Ocean. Generally southerly winds will continue into the day
on Sunday as a weak surface front moves into western Wisconsin,
ultimately stopping short of the open waters. Periods of showers and
storms are forecast this evening through Sunday night. Widespread
severe weather is not expected, though a few storms could produce
brief gusty winds. Winds will trend south to southwesterly during
the day Monday as 1002 mb low pressure moves into the Hudson Bay.

Breezy southerly winds will continue in nearshore zones through the
rest of this afternoon, with widespread 22-25 knot gusts
anticipated. The gusts will be accompanied by elevated wave heights,
particularly from Port Washington and points north. Gusts and wave
heights will gradually taper from south to north through this
evening, with decreasing trends continuing after midnight. A Small
Craft Advisory thus remains in effect until 7 PM CDT from Port
Washington south to Winthrop Harbor, and until 10 PM CDT from Port
Washington to Sheboygan. Periods of showers and thunderstorms are
forecast this evening through early Monday morning. A few storms
could produce gusty winds, particularly this evening.

Quigley

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...Beach Hazards Statement...WIZ052-WIZ060 until 10 PM Saturday.

     Flood Watch...WIZ046-WIZ047-WIZ051-WIZ052-WIZ056-WIZ057-WIZ058-
     WIZ059-WIZ062-WIZ063-WIZ064-WIZ067-WIZ068-WIZ069 until 7
     AM Monday.

LM...Small Craft Advisory...LMZ643 until 10 PM Saturday.

     Small Craft Advisory...LMZ644-LMZ645-LMZ646 until 7 PM
     Saturday.

&&

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Hazardous weather outlook, Aug 9, 7:52 PM CDT, 12 minutes before
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
752 PM CDT Sat Aug 9 2025

WIZ046-047-051-052-056>060-062>072-110100-
Marquette-Green Lake-Fond du Lac-Sheboygan-Sauk-Columbia-Dodge-
Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee-
Lafayette-Green-Rock-Walworth-Racine-Kenosha-
752 PM CDT Sat Aug 9 2025

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

.DAY ONE...Tonight

A Flood Watch is in effect for the potential for flash flooding
across all of southern Wisconsin into Monday morning. Multiple
rounds of thunderstorms with heavy rain are forecast.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

A Flood Watch will remain in effect for the potential for flash
flooding across all of southern Wisconsin into Monday morning.
Multiple rounds of thunderstorms with heavy rain are forecast.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

LMZ643>646-110100-
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-
752 PM CDT Sat Aug 9 2025

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

.DAY ONE...Tonight

Numerous thunderstorms with frequent lightning and heavy rain.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Thunderstorm chances linger into next week.

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-110100-
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-
752 PM CDT Sat Aug 9 2025

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

.DAY ONE...Tonight

Numerous thunderstorms with frequent lightning and heavy rain over
the south half.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday

Thunderstorm chances linger into next week.

www.weather.gov/mkx

In the hours before

Special weather statement, Aug 9, 2:46 PM CDT, 5 hours 18 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
246 PM CDT Sat Aug 9 2025

WIZ058-092030-
Dodge WI-
246 PM CDT Sat Aug 9 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN DODGE COUNTY
THROUGH 330 PM CDT...

At 246 PM CDT, Doppler radar was tracking a strong thunderstorm near
Fall River, or near Columbus, moving northeast at 20 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Beaver Dam, Waupun, Columbus, Lomira, Burnett, Fox Lake, Brownsville,
Danville, South Beaver Dam, Atwater, Astico, and Leipsig.

This includes U.S. Highway 151 between mile markers 120 and 146.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4327 8901 4345 8901 4363 8897 4363 8844
TIME...MOT...LOC 1946Z 221DEG 17KT 4339 8896

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

BOXELL
Special weather statement, Aug 9, 3:06 PM CDT, 4 hours 58 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
306 PM CDT Sat Aug 9 2025

WIZ051-052-058-059-063>065-092030-
Dodge WI-Waukesha WI-Sheboygan WI-Washington WI-Fond Du Lac WI-
Jefferson WI-Dane WI-
306 PM CDT Sat Aug 9 2025

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN FOND DU LAC...
NORTHWESTERN WAUKESHA...SOUTHEASTERN DANE...WASHINGTON...JEFFERSON...
EASTERN DODGE AND SOUTHWESTERN SHEBOYGAN COUNTIES THROUGH 330 PM
CDT...

At 304 PM CDT, Doppler radar was tracking strong thunderstorms
developing along a line extending from near Theresa to near
Stoughton. This line of development is moving southeast at 25 mph.
Once storms develop individual storms will move to the northeast.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
West Bend, Watertown, Hartford, Stoughton, Fort Atkinson, Jefferson,
Lake Mills, Edgerton, Mayville, Slinger, Kewaskum, Horicon, Waterloo,
Juneau, Okauchee Lake, Oconomowoc, Johnson Creek, Lomira, Deerfield,
and Campbellsport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4364 8788 4354 8799 4354 8804 4350 8804
      4284 8879 4285 8934 4365 8846
TIME...MOT...LOC 2004Z 286DEG 22KT 4352 8838 4295 8921

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

BOXELL
Special weather statement, Aug 9, 3:41 PM CDT, 4 hours 23 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
341 PM CDT Sat Aug 9 2025

WIZ051-052-058>060-063>066-092145-
Dodge WI-Waukesha WI-Milwaukee WI-Sheboygan WI-Washington WI-
Ozaukee WI-Fond Du Lac WI-Jefferson WI-Dane WI-
341 PM CDT Sat Aug 9 2025

...STRONG THUNDERSTORMS WILL IMPACT OZAUKEE...SOUTHEASTERN FOND DU
LAC...NORTHWESTERN MILWAUKEE...NORTHERN WAUKESHA...EASTERN DANE...
WASHINGTON...NORTHERN JEFFERSON...EASTERN DODGE AND SHEBOYGAN
COUNTIES THROUGH 445 PM CDT...

At 339 PM CDT, Doppler radar was tracking a large area of strong
thunderstorms along a line extending from near Elkhart Lake to near
Lake Mills. Movement of this line was east at 30 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Northern Milwaukee, Sheboygan, Wauwatosa, Brookfield, Menomonee
Falls, West Bend, Watertown, Mequon, Hartford, Whitefish Bay,
Pewaukee, Brown Deer, Grafton, Cedarburg, Port Washington, Sussex,
Hartland, Plymouth, Sheboygan Falls, and Delafield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4356 8779 4346 8780 4337 8788 4326 8791
      4318 8788 4314 8790 4310 8789 4311 8909
      4389 8815 4389 8773 4381 8773 4376 8770
      4374 8771 4370 8770
TIME...MOT...LOC 2039Z 252DEG 27KT 4387 8793 4307 8886

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

BOXELL
Special weather statement, Aug 9, 4:44 PM CDT, 3 hours 20 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
444 PM CDT Sat Aug 9 2025

WIZ052-059-060-065-066-092215-
Waukesha WI-Milwaukee WI-Sheboygan WI-Washington WI-Ozaukee WI-
444 PM CDT Sat Aug 9 2025

...STRONG THUNDERSTORMS WILL IMPACT OZAUKEE...NORTHERN MILWAUKEE...
NORTHERN WAUKESHA...SOUTHEASTERN WASHINGTON AND SOUTHEASTERN
SHEBOYGAN COUNTIES THROUGH 515 PM CDT...

At 444 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from 9 miles east of Sheboygan
to Lisbon. Movement was east at 25 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Northern Milwaukee, Sheboygan, Wauwatosa, Brookfield, Menomonee
Falls, Mequon, Whitefish Bay, Pewaukee, Brown Deer, Grafton,
Cedarburg, Port Washington, Sussex, Hartland, Delafield, Jackson, Fox
Point, Saukville, Bayside, and Thiensville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4368 8770 4357 8779 4349 8779 4338 8787
      4326 8791 4318 8788 4312 8790 4310 8788
      4310 8844 4373 8771
TIME...MOT...LOC 2144Z 255DEG 24KT 4376 8755 4314 8825

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

BOXELL
Local storm report, Aug 9, 5:12 PM CDT, 2 hours 52 minutes before
Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
512 PM CDT Sat Aug 9 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0500 PM     Tstm Wnd Dmg     Menomonee Falls         43.18N 88.12W
08/09/2025                   Waukesha           WI   Law Enforcement

            Menomonee Falls PD reports multiple large
            branches and a few 7 to 8 inch diameter
            trees down, with at least one of those
            toppling some power lines.

&&

BHS
Special weather statement, Aug 9, 6:32 PM CDT, 1 hour 32 minutes before
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
632 PM CDT Sat Aug 9 2025

WIZ060-066-092345-
Milwaukee WI-Ozaukee WI-
632 PM CDT Sat Aug 9 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL OZAUKEE AND
NORTHWESTERN MILWAUKEE COUNTIES THROUGH 645 PM CDT...

At 631 PM CDT, Doppler radar was tracking a strong thunderstorm over
northern Milwaukee, moving northeast at 35 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Northern Milwaukee, Mequon, Whitefish Bay, Brown Deer, Fox Point,
Bayside, Glendale, and River Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4315 8789 4314 8790 4312 8790 4309 8795
      4312 8807 4318 8806 4324 8791 4321 8790
      4319 8790 4318 8788
TIME...MOT...LOC 2331Z 225DEG 31KT 4315 8796

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

BOXELL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 10:23 PM CDTSpecial Weather StatementMKXJefferson52 min
Aug 9, 11:14 PM CDTFlash Flood WarningMKXWaukesha4 hr
Aug 9, 11:29 PM CDTAreal Flood AdvisoryMKXWaukesha3 hr
Aug 10, 12:02 AM CDTAreal Flood AdvisoryMKXDodge, Milwaukee, Ozaukee, Washington, Waukesha3 hr
Aug 10, 1:07 AM CDTFlash Flood Warning Considerable damage threatMKXMilwaukee, Waukesha4 hr
Aug 10, 1:17 AM CDTRiver Flood WarningMKXWaukesha7 days
Aug 10, 1:18 AM CDTRiver Flood WarningMKXMilwaukee21 days
Aug 10, 1:38 AM CDTFlash Flood WarningMKXOzaukee, Washington4 hr
Aug 10, 2:03 AM CDTRiver Flood WarningMKXMilwaukee21 days
Aug 10, 2:05 AM CDTRiver Flood WarningMKXMilwaukee21 days
Aug 10, 2:38 AM CDTRiver Flood WarningMKXWaukesha4 hr
Aug 10, 2:44 AM CDTRiver Flood WarningMKXMilwaukee3 hr
Aug 10, 3:32 AM CDTAreal Flood AdvisoryMKXDodge, Ozaukee, Washington3 hr
Aug 10, 5:02 AM CDTAreal Flood WarningMKXMilwaukee, Waukesha14 hr
Aug 10, 5:16 AM CDTFlash Flood WarningMKXOzaukee, Washington3 hr
Aug 10, 5:27 AM CDTRiver Flood WarningMKXMilwaukee47 hr
Aug 10, 6:52 AM CDTAreal Flood AdvisoryMKXDane3 hr
Aug 10, 7:59 AM CDTFlash Flood Warning Considerable damage threatMKXMilwaukee, Ozaukee, Washington, Waukesha3 hr
Aug 10, 8:55 AM CDTFlash Flood WarningMKXDodge, Washington, Waukesha3 hr
Aug 10, 9:20 AM CDTAreal Flood WarningMKXOzaukee, Washington10 hr
Aug 10, 11:03 AM CDTAreal Flood WarningMKXMilwaukee, Ozaukee, Washington, Waukesha8 hr
Aug 10, 11:42 AM CDTRiver Flood WarningMKXOzaukee4 days
Aug 10, 11:42 AM CDTRiver Flood WarningMKXOzaukee4 days
Aug 10, 11:49 AM CDTAreal Flood WarningMKXDodge, Washington, Waukesha7 hr
Aug 10, 2:53 PM CDTMarine Dense Fog AdvisoryMKX6 hr
Aug 10, 5:36 PM CDTAreal Flood WarningMKXDodge, Jefferson, Milwaukee, Ozaukee, Racine, Washington and 1 more16 hr

Nearby

Flash Flood Warnings in Wisconsin, 2025Every flash flood warning in 2025

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.