Trempealeau County, Wisconsin: hazard history
What federal records show has already happened here: disaster declarations, storms, and flood insurance claims. This is a record of the past. It is not a forecast and not a hazard score.
At a glance
What this means
- The event NOAA recorded most often here is Hail, with 180 records.
- The costliest single record is Thunderstorm Wind in 2012: $3.5M in property damage, in the dollars of that year.
- The deadliest record is Heavy Rain in 2014, with 3 deaths.
- FEMA has declared 15 disasters that named this county, most often for severe storm.
- The worst year for flood insurance claims was 2010, with 28 claims.
What this can't tell you
- What happens next. Past events do not set the odds of the next one.
- Anything before 1996 from NOAA. That is when NOAA began recording every event type; earlier files hold only tornado, hail and wind, so they are left out on purpose.
- Today's cost. Damage and payments are in the dollars of the year they happened.
- A flood rate. NFIP counts claims but not how many homes were insured, and many flooded homes carry no flood insurance.
- Earthquakes, wildfire perimeters or radar-detected hail. Those records are not tied to counties.
Federal disaster declarations (FEMA)
FEMA declared 15 disasters that named Trempealeau County between 1965 and 2020.
| Incident type | Disasters | Most recent |
|---|---|---|
| Severe Storm | 7 | 2017 |
| Flood | 3 | 2001 |
| Biological | 2 | 2020 |
| Drought | 1 | 1976 |
| Hurricane | 1 | 2005 |
| Tornado | 1 | 1965 |
Most recent declarations
- EM-3454 2020 · Biological · Covid-19
- DR-4520 2020 · Biological · Covid-19 Pandemic
- DR-4343 2017 · Severe Storm · Severe Storms, Straight-line Winds, Flooding, Landslides, And Mud
- DR-1944 2010 · Severe Storm · Severe Storms And Flooding
- EM-3249 2005 · Hurricane · Hurricane Katrina Evacuation
- DR-1526 2004 · Severe Storm · Severe Storms And Flooding
- DR-1369 2001 · Flood · Flooding, Severe Storms And Tornadoes
- DR-1236 1998 · Severe Storm · Severe Storms,straigh Line Winds, Tornadoes,rain,and Floodi
- DR-994 1993 · Severe Storm · Severe Storms, Tornadoes & Flooding
- DR-964 1992 · Flood · Severe Storms & Flooding
Not counted above: 5 statewide declarations, which covered every county in Wisconsin. A declaration is a decision to send federal help, not a measure of how bad an event was. Records run from 1953. Source: FEMA OpenFEMA Disaster Declarations Summaries.
Storms recorded by NOAA, by type
| Event type | Records | Deaths | Injuries | Property damage |
|---|---|---|---|---|
| Hail | 180 | 0 | 0 | $5.6M |
| Thunderstorm Wind | 154 | 0 | 7 | $6.0M |
| Flood | 82 | 0 | 1 | $7.3M |
| Winter Storm | 59 | 0 | 0 | $117K |
| Heavy Rain | 33 | 4 | 0 | $45K |
| Flash Flood | 21 | 0 | 0 | $5.6M |
| Winter Weather | 20 | 1 | 0 | $70K |
| Heavy Snow | 18 | 0 | 0 | $0 |
| Drought | 14 | 0 | 0 | $0 |
| Tornado | 14 | 0 | 1 | $1.5M |
| Cold/Wind Chill | 9 | 0 | 0 | $0 |
| Extreme Cold/Wind Chill | 9 | 0 | 0 | $0 |
| Heat | 8 | 1 | 0 | $0 |
| Ice Storm | 6 | 0 | 2 | $8K |
| Lightning | 6 | 1 | 1 | $1.6M |
| Excessive Heat | 5 | 0 | 0 | $0 |
| Funnel Cloud | 5 | 0 | 0 | $0 |
| High Wind | 5 | 0 | 0 | $112K |
| Blizzard | 3 | 0 | 0 | $310K |
| Dense Fog | 3 | 2 | 0 | $15K |
| Frost/Freeze | 2 | 0 | 0 | $0 |
| Strong Wind | 2 | 0 | 0 | $400 |
| Wildfire | 2 | 2 | 2 | $0 |
Records start in 1996. Damage is NOAA's estimate at the time, in nominal dollars, and is often rounded; it is not insurance claims data. A storm that crossed two NOAA zones in this county is recorded, and counted, once per zone. A storm filed against a forecast zone is counted in every county that zone covers, with the whole storm's damage; do not add these figures across counties.
Year by year
NOAA storm event records in Trempealeau County each year. The busiest year was 2017, with 54 records.
Show the numbers for every year
| Year | Records | Deaths | Property damage |
|---|---|---|---|
| 1996 | 17 | 0 | $31K |
| 1997 | 13 | 0 | $59K |
| 1998 | 16 | 0 | $1.2M |
| 1999 | 12 | 0 | $61K |
| 2000 | 16 | 1 | $51K |
| 2001 | 32 | 0 | $242K |
| 2002 | 5 | 0 | $18K |
| 2003 | 4 | 0 | $3K |
| 2004 | 17 | 0 | $19K |
| 2005 | 15 | 0 | $20K |
| 2006 | 17 | 1 | $28K |
| 2007 | 19 | 0 | $27K |
| 2008 | 17 | 1 | $27K |
| 2009 | 12 | 1 | $26K |
| 2010 | 42 | 1 | $5.2M |
| 2011 | 22 | 0 | $1.4M |
| 2012 | 22 | 0 | $3.6M |
| 2013 | 38 | 1 | $68K |
| 2014 | 23 | 3 | $62K |
| 2015 | 25 | 0 | $1.8M |
| 2016 | 26 | 0 | $1.1M |
| 2017 | 54 | 0 | $7.7M |
| 2018 | 18 | 0 | $31K |
| 2019 | 33 | 1 | $1.6M |
| 2020 | 16 | 1 | $162K |
| 2021 | 33 | 0 | $2.7M |
| 2022 | 8 | 0 | $0 |
| 2023 | 34 | 0 | $76K |
| 2024 | 28 | 0 | $406K |
| 2025 | 15 | 0 | $0 |
| 2026 | 11 | 0 | $604K |
Years with no record are left out of the table, not shown as zero.
Notable events
Costliest records
- Thunderstorm Wind · May 2, 2012$3.5MNOAA name: Trempealeau County · NOAA record 372053
- Flood · Sep 23, 2010$3.3MNOAA name: Trempealeau County · NOAA record 259628
- Flash Flood · Jul 19, 2017$2.6MNOAA name: Trempealeau County · NOAA record 710356
- Flood · Jul 20, 2017$1.6MNOAA name: Trempealeau County · NOAA record 712553
- Flood · Sep 23, 2010$1.5MNOAA name: Trempealeau County · NOAA record 262998
Deadliest records
- Heavy Rain · Aug 18, 20143 deathsNOAA name: Trempealeau County · $25K damage · NOAA record 536655
- Dense Fog · Aug 23, 20001 deathNOAA name: NWS forecast zone · NOAA record 5155944
- Lightning · Oct 2, 20061 deathNOAA name: Trempealeau County · 1 injury · NOAA record 570
- Dense Fog · May 16, 20081 deathNOAA name: NWS forecast zone · $5K damage · NOAA record 160188
- Winter Weather · Jan 12, 20091 deathNOAA name: NWS forecast zone · NOAA record 160186
Each line is one NOAA record, linked to its page at NOAA. One large storm can appear more than once if NOAA recorded it in several zones of this county. Dollars are nominal.
Flood insurance claims (NFIP)
The National Flood Insurance Program paid $2.6M on 142 claims in Trempealeau County from 1986 to 2024.
| Year | Claims | Paid |
|---|---|---|
| 2010 | 28 | $573K |
| 2017 | 25 | $1.1M |
| 1993 | 15 | $90K |
| 1997 | 14 | $106K |
| 2001 | 13 | $157K |
A count of claims, not a rate: NFIP publishes no count of insured homes beside it, and most flood damage is uninsured. Nominal dollars. Records run from 1978 to 2024; claims filed without a county code are not on any county page. Source: FEMA OpenFEMA FIMA NFIP Redacted Claims.
Hazard vulnerability analysis: the probability column for a facility in Trempealeau County
A hazard vulnerability analysis rates each hazard for probability, impact, preparedness and response. Probability is the one column the county’s federal record can fill — NCEI storm events from 1996 to 2026 and FEMA declarations naming the county — and this is what it says for a facility here, on the 0–3 scale of the all-hazards structure surveyors expect. The other six columns are the facility’s own judgment about its building, and Calchis leaves them blank.
| Hazard | Prob. | Basis, from the county record |
|---|---|---|
| Severe Thunderstorm | 3 | 340 NCEI events over 31 years (10.97/yr). 7 federal disaster declarations naming the county. |
| Flood, External | 3 | 136 NCEI events over 31 years (4.39/yr). 3 federal disaster declarations naming the county. |
| Snow Fall / Blizzard / Ice Storm | 3 | 106 NCEI events over 31 years (3.42/yr). No federal disaster declaration of this kind has named the county. |
| Temperature Extremes | 3 | 33 NCEI events over 31 years (1.06/yr). No federal disaster declaration of this kind has named the county. |
| Hurricane / Tropical Storm | 2 | No events of this kind on the county's NCEI record over 31 years. 1 federal disaster declaration naming the county. |
| Tornado | 2 | 14 NCEI events over 31 years (0.45/yr). 1 federal disaster declaration naming the county. |
| Drought | 2 | 14 NCEI events over 31 years (0.45/yr). 1 federal disaster declaration naming the county. |
| High Wind (non-convective) | 2 | 7 NCEI events over 31 years (0.23/yr). No federal disaster declaration of this kind has named the county. |
| Epidemic | 2 | 2 federal disaster declarations naming the county. |
| Wild Fire | 1 | 2 NCEI events over 31 years (0.06/yr). No federal disaster declaration of this kind has named the county. |
| Earthquake | 1 | No federal disaster declaration of this kind has named the county. |
| Landslide | 1 | No events of this kind on the county's NCEI record over 31 years. No federal disaster declaration of this kind has named the county. |
| Tidal Wave / Tsunami | 1 | No events of this kind on the county's NCEI record over 31 years. No federal disaster declaration of this kind has named the county. |
| Volcano | 1 | No events of this kind on the county's NCEI record over 31 years. No federal disaster declaration of this kind has named the county. |
| Dam Inundation | 1 | No federal disaster declaration of this kind has named the county. |
A dash means the record does not speak to that hazard; it is not a zero. Whether a finished document satisfies the CMS Emergency Preparedness Rule is the facility’s finding and its surveyor’s. Complete the HVA for a facility in Trempealeau County — the technological, human and hazardous-materials rows, the six facility columns, the approval and the printed document — or read the sample analysis on that page first.
How this page was made
- Every figure is counted from public federal records held by Calchis: NOAA NCEI Storm Events, FEMA OpenFEMA Disaster Declarations, and FEMA NFIP claims. Nothing is modeled or estimated.
- NOAA files some events against a county and others against an NWS forecast zone, and publishes a code for both. Records are counted as Trempealeau County by that code — county records by the county's own FIPS code, zone records through the National Weather Service's published list of which counties each zone covers. No name matching is involved. Of 660 records, 491 were filed against this county and 169 against a forecast zone covering it. A zone storm is counted in every county its zone covers, and its damage figure is the whole storm's, not this county's share — NOAA does not publish that split. So these figures describe this county; they must not be added up across counties.
- Counts last rebuilt from the source records on Sep 15, 2026.
Related
Responsible for Trempealeau County?
This page is the record of what has happened. Calchis also watches live NWS, USGS and NHC feeds against the places you name and alerts you when an event approaches them.
Free includes Live map + 3 triggers + 10 bond positions. Analyst is $149/mo for 1,000-location portfolios, ep curves, predictions, parametric triggers.
Recorded history from federal public records. Not a hazard score, a risk score, or a forecast, and not a substitute for professional actuarial or emergency-management assessment. Decision-support intelligence — not a primary alerting or dispatch system. Verify against official sources.