States › Missouri › Mercer County
Mercer County, Missouri
Recorded hazard history: storm events since 1950, federal disaster declarations since 1953, flood insurance claims since 1978, and FEMA's risk index.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. NCEI storm records through 30 Jun 2026; OpenFEMA declarations refreshed 29 Sep 2026; NFIP claims as of 8 Sep 2026.
The NCEI record lists 287 events for Mercer County, Missouri, between 1950 and 2026; hail account for the largest share.
That is 63.2 events per 100 square miles, below the Missouri figure of 106.7, and 822.8 per 10,000 residents against 118.9 statewide.
5 events fall in the 12 months to 30 Jun 2026. NCEI attributes 0 deaths and 1 injury to events in the county, with property damage estimated at $1.0M.
FEMA has designated the county in 20 federal disaster declarations since 1953; the most recent is Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (major disaster, 3 Aug 2026).
OpenFEMA lists no National Flood Insurance Program claims in the county.
FEMA's National Risk Index rates the county's overall risk as "Very Low" and its expected annual loss as "Very Low" ($4.0M a year across 18 hazards).
1 tropical storm or hurricane track in the HURDAT2 record passed within 100 miles of the county's centre at tropical-storm strength or more, 0 of them within 50 miles at hurricane strength.
Compared with Missouri and the United States
| Measure | Mercer County | Missouri | US |
|---|---|---|---|
| Recorded events since 1950 | 287 | 73,339 | 1,977,440 |
| Events per 100 square miles | 63.2 | 106.7 | 56.0 |
| Events per 10,000 residents | 822.8 | 118.9 | 59.6 |
| Events in the last 12 months | 5 | 1,920 | 62,008 |
| Deaths recorded by NCEI | 0 | 1,009 | 26,435 |
| Property damage (NCEI estimates) | $1.0M | $12B | $575B |
| NFIP claims per 1,000 residents | 0.0 | 8.3 | 8.1 |
| Average paid NFIP claim | — | $23K | $43K |
| Claims per 100 policies in force, last 10 years | — | 51.0 | 16.1 |
County-recorded events plus zone-recorded events whose forecast zone is named for the county. State and US rows include events recorded only by forecast zone. Rates use 2021 Census population and land area.
Events by decade
Trend: 169 events in the 20 years to 2025 against 92 in the 20 years before. Reporting practice changed in 1996 and again with automated reports in the 2000s, so decade totals measure the record as much as the weather.
Events by type
Hazard pages exist for hail, tornado, flood, wind and winter where the county has at least 10 recorded events. "Other" covers heavy rain, debris flow, dust, funnel clouds and similar reports.
Largest recorded events
| Date | Event type | Group | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|---|
| 21 Apr 1973 | Tornado | Tornado | F4 | $250K | — | — | 1 | County |
| 10 Apr 1997 | Heavy Snow | Winter | — | $500K | — | — | — | Forecast zone |
Ranked by deaths, then injuries, then NCEI's damage estimate. Deaths and injuries are NCEI counts (direct plus indirect); no personal details are recorded here.
Federal disaster declarations
| Declared | Number | Type | Incident | Title | Programs |
|---|---|---|---|---|---|
| 3 Aug 2026 | DR-4929 | Major disaster | Severe Storm | Severe Storms, Straight-Line Winds, Tornadoes, And Flooding | Public assistance |
| 26 Mar 2020 | DR-4490 | Major disaster | Biological | Covid-19 Pandemic | Individual assistance, Public assistance |
| 13 Mar 2020 | EM-3482 | Emergency | Biological | Covid-19 | Public assistance |
| 9 Jul 2019 | DR-4451 | Major disaster | Severe Storm | Severe Storms, Tornadoes, And Flooding | Public assistance |
| 31 Oct 2014 | DR-4200 | Major disaster | Severe Storm | Severe Storms, Tornadoes, Straight-Line Winds, And Flooding | Public assistance |
| 3 Feb 2011 | EM-3317 | Emergency | Severe Storm | Severe Winter Storm | Public assistance |
| 17 Aug 2010 | DR-1934 | Major disaster | Severe Storm | Severe Storms, Flooding, And Tornadoes | Public assistance |
| 30 Jan 2009 | EM-3303 | Emergency | Severe Ice Storm | Severe Winter Storm | Public assistance |
| 25 Jun 2008 | DR-1773 | Major disaster | Severe Storm | Severe Storms And Flooding | Public assistance |
| 27 Dec 2007 | DR-1736 | Major disaster | Severe Ice Storm | Severe Winter Storms | Public assistance |
| 12 Dec 2007 | EM-3281 | Emergency | Severe Ice Storm | Severe Winter Storms | Public assistance |
| 11 Jun 2007 | DR-1708 | Major disaster | Severe Storm | Severe Storms And Flooding | Public assistance |
| 10 Sep 2005 | EM-3232 | Emergency | Hurricane | Hurricane Katrina Evacuation | Public assistance |
| 11 Jun 2004 | DR-1524 | Major disaster | Severe Storm | Severe Storms, Tornadoes, And Flooding | Individual assistance |
| 6 May 2002 | DR-1412 | Major disaster | Severe Storm | Severe Storms, Tornadoes And Flooding | Public assistance |
| 2 Jun 1995 | DR-1054 | Major disaster | Severe Storm | Severe Storms, Tornadoes, Hail, Flooding | Individual assistance, Public assistance |
| 9 Jul 1993 | DR-995 | Major disaster | Flood | Severe Storms & Flooding | Individual assistance, Public assistance |
| 24 Sep 1976 | EM-3017 | Emergency | Drought | Drought | Public assistance |
| 1 Nov 1973 | DR-407 | Major disaster | Flood | Severe Storms & Flooding | Individual assistance, Public assistance |
| 19 Apr 1973 | DR-372 | Major disaster | Severe Storm | Heavy Rains, Tornadoes & Flooding | Individual assistance, Public assistance |
Declarations in which FEMA designated this county, from the OpenFEMA Disaster Declarations Summaries (v2). DR: major disaster; EM: emergency; FM: fire management assistance. Programs show whether individual or public assistance was made available.
Flood insurance claims
OpenFEMA lists no NFIP claims with this county's code.
National Risk Index
| Hazard (NRI) | Risk rating | Expected annual loss |
|---|---|---|
| Inland flooding | $1,613,607 | |
| Tornado | $754,659 | |
| Drought | $587,183 | |
| Cold wave | $388,577 | |
| Heat wave | $229,996 | |
| Hail | $144,939 | |
| Strong wind | $138,103 | |
| Wildfire | $32,276 | |
| Lightning | $23,095 | |
| Earthquake | $16,369 | |
| Winter weather | $10,772 | |
| Landslide | $10,577 | |
| Ice storm | $3,444 | |
| Hurricane | $1,778 |
FEMA National Risk Index, December 2025 release. Ratings are FEMA's relative comparison of counties; expected annual loss is FEMA's modelled estimate of average yearly building, population and agriculture loss. See how to read the NRI.
Hurricane and tropical storm passes
| Storm | Year | Closest approach | Max wind while within 100 mi |
|---|---|---|---|
| Unnamed Atlantic storm | 1900 | 96 mi | 46 mph |
HURDAT2 best-track positions at tropical-storm strength (34 kt) or more, measured from the county's Census centre point; through the 2025 season. Distance from a track is not the same as the extent of the storm's wind, rain or surge.
Questions and answers
How often does it hail in Mercer County, MO?
NCEI records 89 hail events in Mercer County since 1950, in 31 different years; that is about 1.2 recorded events a year. 21 reports were golf-ball size (1.75 in) or larger.
Has Mercer County had a tornado?
Yes. NCEI records 17 tornadoes in Mercer County since 1950, 5 of them rated (E)F2 or stronger. Tornado deaths recorded: 0.
When was the last federal disaster declaration for Mercer County?
3 Aug 2026: Severe Storms, Straight-Line Winds, Tornadoes, And Flooding, a major disaster declaration for severe storm. The county appears in 20 declarations since 1953.
How many flood insurance claims have been filed in Mercer County, and how much was paid?
OpenFEMA lists no NFIP claims in the county.
Is Mercer County in the National Risk Index's high-risk band?
FEMA's National Risk Index (December 2025) rates the county "Very Low" for overall risk, "Very Low" for expected annual loss, "Relatively High" for social vulnerability and "Very Low" for community resilience. These ratings are FEMA's relative comparison across all US counties.
How does Mercer County compare with the rest of Missouri?
63.2 recorded events per 100 square miles against 106.7 statewide, and 0.0 NFIP claims per 1,000 residents against 8.3. The comparison table on this page shows each measure beside the state and national figures.
Provenance
Storm events: NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026 (public domain). Declarations: OpenFEMA DisasterDeclarationsSummaries v2, refreshed 29 Sep 2026. Flood claims: OpenFEMA NfipClaims v3 as of 8 Sep 2026; NfipMultipleLossProperties v1 (2 Aug 2026); NfipResidentialPenetrationRates v1 (3 Aug 2026). Risk index: FEMA National Risk Index, December 2025. Hurricane tracks: NHC HURDAT2 through 2025. Population and area: US Census Bureau, 2021 vintage. Built 30 Sep 2026; see the methodology and corrections pages. Hazard hubs: Hail · Tornado · Flood · Wind · Winter.