Flood Warning: Pecatonica River, Lafayette Co WI; SE WI multi-county flood watches Sep 19

Late Saturday night, the National Weather Service office in Milwaukee/Sullivan issued a Flood Warning for the East Branch Pecatonica River near Blanchardville in Lafayette County, Wisconsin — the first of several alerts that would expand across southern Wisconsin and into northern Illinois and Indiana before dawn on Sunday, September 21, 2026. The warning, issued at 9:35 PM CDT on September 19, is valid through Monday evening as the river climbs toward a forecast crest that will push above flood stage on already-saturated ground.

By the time that first warning was issued, Flood Watches covered eleven south-central and southeast Wisconsin counties — including Kenosha, Racine, Waukesha, Milwaukee, Rock, Walworth, Jefferson, and Dane — with an additional watch tied to the Fox River affecting Kenosha County and Lake County, Illinois. Northern Indiana was also under watch, with confirmed flooding already occurring in Wells and Adams counties before the watch was even issued. For homeowners in Blanchardville, Kenosha, Racine, Milwaukee, Waukesha, Janesville, Beloit, and Lake County, Illinois, the 24 to 48 hours following this system call for a thorough property inspection as water levels peak and the ground remains unable to absorb additional rainfall.

What the National Weather Service Confirmed

Flood Warning: East Branch Pecatonica River, Lafayette County

NWS Milwaukee/Sullivan issued a Flood Warning at 9:35 PM CDT Saturday, September 19, 2026, for the East Branch Pecatonica River near Blanchardville. The warning is valid through Monday evening, September 21. At 9 PM CDT Saturday, the river measured 10.1 feet — rapidly approaching flood stage of 11.0 feet. The NWS forecast the river to crest at 11.4 feet Sunday morning, placing it 0.4 feet above flood stage.

According to the NWS, at 11.0 feet, floodwaters begin to cover a portion of Highway H and enter McKellar Park in Blanchardville. Residents and travelers in Lafayette County should anticipate road impacts and park closures to remain in effect through the duration of the warning.

Flood Watch: Eleven South-Central and Southeast Wisconsin Counties

Simultaneously with the Lafayette County warning, NWS Milwaukee/Sullivan issued a Flood Watch for eleven south-central and southeast Wisconsin counties — including Kenosha, Racine, Waukesha, Milwaukee, Rock, Walworth, Jefferson, and Dane — through 7 AM CDT Sunday. The watch cited 1 to 1.5 additional inches of rain expected overnight on ground already saturated from prior rainfall, creating elevated risk of rapid runoff and localized flooding across a wide swath of the region.

Fox River Watch: Kenosha County, WI and Lake County, IL

A separate Flood Watch issued by NWS Milwaukee/Sullivan covers the Fox River near New Munster, affecting Kenosha County, Wisconsin, and Lake County, Illinois. The NWS indicated that flood stage on the Fox River — set at 11.0 feet — could be reached Sunday afternoon if rainfall totals verify as forecast. Residents near the Fox River corridor in both counties should monitor NWS updates closely through Sunday.

Northern Indiana Also Under Watch

NWS Northern Indiana issued a Flood Watch through Sunday morning for multiple northern Indiana counties. At the time of issuance, flooding had already occurred in Wells and Adams counties, underscoring how widespread and active this weather system has been across the broader Great Lakes and upper Midwest region. Up-to-date watches and warnings for all affected areas are available at weather.gov.

What Homeowners in the Affected Communities Should Check Now

Even without visible structural damage, heavy rainfall events on saturated ground can leave behind problems that are not immediately obvious. Once conditions are safe, homeowners in Blanchardville, Kenosha, Racine, Milwaukee, Waukesha, Janesville, Beloit, and Lake County should walk their property and inspect the following:

Roof and Gutters

• Missing or displaced shingles: Wind-driven rain can lift shingle edges and break the adhesive seal. Look for shingles on the ground or visible gaps on the slope.
• Gutters and downspouts: Check for debris buildup, separation from the fascia board, or standing water in the gutter trough — all signs of a clog that can back water up under the roofline.
• Downspout discharge: Confirm water is draining away from the foundation and not pooling against the house. A diverted downspout in saturated soil is one of the most common paths to basement intrusion.

Foundation, Basement, and Crawl Space

• Check basement walls, floors, and window wells for moisture, seepage, or standing water. Saturated soil dramatically increases hydrostatic pressure against foundation walls.
• Look for efflorescence — white mineral deposits on concrete — which indicates water has been migrating through the wall, possibly over a longer period than this single storm event.
• If you have a sump pump, confirm it is operating and that the discharge line is clear and directing water well away from the foundation.

Siding and Exterior Envelope

• Walk the full perimeter of the home and look for cracks, gaps, or separation in siding panels. Even a minor opening is sufficient for wind-driven water to penetrate behind the cladding.
• Inspect window and door frames at the seals — look for soft caulk, gaps, or visible water staining around the interior frame that suggests water found a path in.

Trees and Landscaping

• Look for leaning trees, newly exposed root systems, or large branches that have shifted position — saturated soil significantly reduces root stability and can make a standing tree hazardous.
• Clear debris from window wells, basement egress covers, and drainage channels around the property before additional rainfall accumulates.

Attic

• If safely accessible, inspect the attic for any daylight visible through the roof decking, wet or compressed insulation, or moisture on the underside of the rafters — all indicators that water found a path through the roof assembly.

Homeowners in Kenosha, Racine, Milwaukee, Waukesha, Janesville, and Beloit should pay particular attention to drainage patterns on and around their property, especially with additional overnight rainfall still possible through early Sunday morning.

If You Find Damage

Safety First

Do not enter a flooded basement, garage, or crawl space if there is any possibility of electrical contact with standing water. Shut off power at the breaker panel before entering any space with standing water. If flooding is significant or you detect a gas odor, leave the area and contact your utility provider before re-entering. FEMA’s flood safety guidance is available at ready.gov.

Document Before You Clean

Before moving furniture, pulling up ruined carpet, or beginning any cleanup, photograph and video all damage thoroughly — every affected room, every impacted surface, and the full exterior perimeter. Make sure timestamps are enabled on your device. This documentation is a foundational part of your insurance claim and should be preserved before anything is moved or discarded. Save copies off-device in cloud storage or email them to yourself immediately.

Contact Your Insurance Company Promptly

Notify your insurer as soon as possible to open a claim. Most homeowners policies require prompt notice of loss. If your policy includes flood coverage through the National Flood Insurance Program (NFIP) or a private flood insurer, that is typically a separate claim from your standard homeowners policy — both may need to be filed independently. Your agent can clarify your coverage.

Work With a Licensed Restoration Contractor

Allied Emergency Services has been serving the Greater Midwest since 2015 — more than a decade in storm damage restoration across Illinois and Wisconsin. As a licensed restoration contractor, Allied can document damage in detail, prepare written repair estimates, and meet with your insurance adjuster on-site to walk through the full scope of work. Allied does not negotiate, settle, or adjust insurance claims on your behalf — that responsibility belongs to your insurance adjuster or, if you choose to hire one, a licensed public adjuster.

Licensing matters. Unlicensed work can compromise your insurance claim, create liability exposure on your property, and leave repair quality unverified. Allied holds an Illinois Roofing Contractor license (#104.019029), EPA Lead-Safe Certification, IICRC restoration certification, and is a FEMA SKYWARN-trained storm spotter operation — credentials that matter when the work is connected to an insurance claim.

For emergency services — tarping, board-up, or water extraction — that cannot wait for business hours, Allied’s response line is staffed around the clock. Storms don’t keep office hours, and neither do we.

Contact Allied Emergency Services — 24/7

If you’re in Kenosha, Racine, Milwaukee, Waukesha, Janesville, Beloit, or Lake County, Illinois, and you find damage from this storm system, Allied Emergency Services is ready to respond.

• Call: (800) 792-0212 — 24 hours a day, 7 days a week
• Text: ESTIMATE to (844) 907-2546

Learn more about Allied’s storm damage restoration services across the Greater Midwest.

This article is provided as general information only and does not constitute legal or insurance advice. For guidance specific to your policy, coverage, or claim, consult your insurance company or a licensed public adjuster.