Enter any address in Winnebago County, Wisconsin to see its FEMA flood zone
Flash flooding from summer thunderstorms is a significant flood character in Winnebago County, WI. Between 1993 and 2023, NOAA Storm Events data recorded 18 flood events, including 6 instances of flash flooding. Recent examples include heavy rainfall causing flash flooding on July 16, 2025, with some areas receiving over 5 inches of rain, and urban and flash flooding on August 28, 2018, following severe thunderstorms that dropped 2 to 4 inches of rain.
National Flood Insurance Program (NFIP) claims data shows a variety of flood zones with associated claim payouts and water depths. Zone A, typically considered high-risk, had 85 claims with an average payout of $18,876 and an average water depth of 1.3 feet. Zone X, generally considered moderate to low risk, had 50 claims with a higher average payout of $24,967 and an average water depth of 3.5 feet. Homeowners in Zone A, as well as those in any flood zone experiencing higher than average water depths, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
7 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Winnebago County, Wisconsin has recorded 18 flood-related events since 1996 according to NOAA's Storm Events Database, including 6 flash floods and 12 river or area floods. The county has received 11 federal disaster declarations, 1 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1974–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 5, 2008 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Storms And Flooding | Severe Storm | May 7, 2004 |
| Flooding, Severe Storms And Tornadoes | Flood | Apr 10, 2001 |
| Severe Storms, Tornadoes & Flooding | Severe Storm | Jun 7, 1993 |
| Severe Storms, Tornadoes & Flooding | Severe Storm | Jun 22, 1990 |
| Drought | Drought | Jun 17, 1976 |
| Tornadoes | Tornado | Apr 26, 1974 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 16, 2025 | 0.00K |
| Flood | Aug 28, 2018 | 2.00K |
| Flood | Jun 12, 2017 | 2.00K |
| Flash Flood | May 3, 2012 | 200.00K |
| Flash Flood | Jul 14, 2010 | 0.00K |
| Flash Flood | Jun 12, 2008 | 18.60M |
| Flood | Jun 8, 2008 | 625.00K |
| Flood | May 21, 2004 | — |
| Flood | Jun 15, 2004 | — |
| Flood | Jun 11, 2004 | 876K |
Flash Flood — Jul 16, 2025
Showers and thunderstorms tracked through central and east-central Wisconsin during the afternoon and evening on Wednesday (7/16) as a mesoscale convective vortex tracked along a cold front through southern Wisconsin. This system brought a brief period of heavy rainfall with rainfall amounts of 2 to 4 inches and locally higher amounts exceeding 5 inches across the area. The heavy rain in a sh...
Flood — Aug 28, 2018
Severe thunderstorms produced wind damage, including a tornado, over east-central Wisconsin. Numerous trees were snapped or uprooted and power lines downed. The storms also produced torrential rainfall that caused urban flooding and flash flooding in parts of the Green Bay area and Fox Valley. There were numerous reports of 2 to 4 inches of rain, along with a few even higher totals.
Flood — Jun 12, 2017
A stalled front across central and east central Wisconsin was the focus for severe thunderstorms. Storms developed in southern Minnesota and a bow echo formed that made its way across Wisconsin south of Highway 29. The worst damage was around Stevens Point (Portage Co.) where thunderstorm winds downed numerous trees and power lines. Power was knocked out to 15,000 to 18,000 customers. The storm...
Flash Flood — May 3, 2012
Thunderstorms developed over northeast Iowa Wednesday evening before tracking over east central Wisconsin overnight on May 2nd into the morning of May 3rd. Rainfall measurements for the 24 hour period ending around 7 am CDT indicated a widespread 2 to 4.5 inches of rain over east central Wisconsin. A roughly 15 mile wide core of higher rainfall amounts, more than 4 inches, fell from Berlin to...
Flash Flood — Jul 14, 2010
Numerous thunderstorms formed along a cold front that moved across the western Great Lakes. Storms that moved through northeast Minnesota and northwest Wisconsin during the night July 13 intensified during the day on July 14 as they moved across northeast Wisconsin. The storms produced wind gusts as high as 95 mph, funnel clouds, a weak tornado, and very heavy rainfall. The thunderstorms lef...
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Winnebago County, Wisconsin:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Winnebago County, Wisconsin that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.