Enter any address in Green County, Wisconsin to see its FEMA flood zone
Flash flooding from summer thunderstorms is the dominant flood character in Green County. Between 1996 and 2024, NOAA Storm Events data recorded 40 flood events and 18 flash flood events. Recent examples include flash flooding on July 15, 2024, caused by thunderstorms along a cold front, and widespread flooding on June 22, 2024, following severe thunderstorms that produced heavy rainfall.
NFIP claims data indicates that properties in Zone A have experienced the most flood claims, with an average payout of $6,337 and an average water depth of 2.7 feet. However, properties in Zone X have also seen claims, with Zone X_UNSHADED having the highest average payout at $9,637, despite an average reported water depth of -1.5 feet. Properties in Zone X_SHADED and Zone UNKNOWN have had fewer claims with minimal or no reported water depth.
Homeowners in areas designated as Zone A, as well as those residing near creeks and rivers, should pay particular attention to flood risk. Residents in Zone X, especially Zone X_UNSHADED, should also be aware of potential flood impacts.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
37 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Green County, Wisconsin has recorded 58 flood-related events since 1996 according to NOAA's Storm Events Database, including 18 flash floods and 40 river or area floods. The county has received 17 federal disaster declarations, 3 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1969–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Winter Storm And Snowstorm | Snowstorm | Jan 31, 2011 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 5, 2008 |
| Record Snow And Near Record Snow | Snowstorm | Feb 5, 2008 |
| Severe Storms And Flooding | Severe Storm | Aug 18, 2007 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Storms And Flooding | Severe Storm | May 7, 2004 |
| Snow | Snowstorm | Dec 11, 2000 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | May 26, 2000 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Jun 22, 2024 | 2.00K |
| Flash Flood | Jul 15, 2024 | 10.00K |
| Flood | Sep 15, 2019 | 1.00K |
| Flood | Mar 13, 2019 | 25.00K |
| Flood | Mar 13, 2019 | 10.00K |
| Flood | Oct 1, 2019 | 20.00K |
| Flood | Sep 23, 2018 | 1.00K |
| Flood | Aug 22, 2018 | 1.00K |
| Flood | Aug 22, 2018 | 5.00K |
| Flood | Feb 21, 2018 | 10.00K |
Flood — Jun 22, 2024
Severe thunderstorms developed across western Wisconsin and moved eastward across southern Wisconsin through the afternoon and evening hours on June 22nd due to passing low pressure and its approaching cold front. There were supercell thunderstorms along with bowing segments along this line which lead to multiple areas of damage. Two strong tornadoes occurred, which were rated EF-2 near Argyl...
Flash Flood — Jul 15, 2024
A complex of thunderstorms along a cold front moved across southern Wisconsin causing locally damaging winds, large hail and flash flooding. A tornado occurred near Evansville.
Flood — Sep 15, 2019
A strong squall line with torrential rainfall moved east along and north of warm front over southern WI. A quick 2.5-4.5 inches of rain resulted in the flash flooding of creeks, small rivers, and urban and rural roadways. Some trees were downed by straight-line winds. A 42 unit apartment building burned down in Waukesha after being struck by lightning.
Flood — Mar 13, 2019
Mild temperatures and some rainfall led to snow melt and excessive runoff on a frozen ground. Numerous rivers flooded including flooding in atypical areas due to ice jams. Evacuations were needed in some communities. The American Red Cross did respond in some cases to aid the flood victims.
Flood — Oct 1, 2019
After several inches of rain on October 1-2, with the passage of a slow moving cold front, many rivers reached flood stage with some flooding that continued well into October.
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 Green 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 Green 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.