Hamlin County, South Dakota: hazard history

FEMA declared 22 disasters that named Hamlin County between 1969 and 2022.

Most recent declarations

• DR-4689 2022 · Winter Storm · Severe Winter Storms And Snowstorm
• DR-4656 2022 · Severe Storm · Severe Storm, Straight-line Winds, Tornadoes, And Flooding
• DR-4527 2020 · Biological · Covid-19 Pandemic
• EM-3475 2020 · Biological · Covid-19
• DR-4463 2019 · Flood · Severe Storms And Flooding
• DR-4440 2019 · Flood · Severe Winter Storm, Snowstorm, And Flooding
• DR-4298 2016 · Severe Storm · Severe Winter Storm
• DR-4137 2013 · Severe Storm · Severe Storms, Tornadoes, And Flooding
• DR-1984 2011 · Flood · Flooding
• DR-1915 2010 · Flood · Flooding

Not counted above: 40 statewide declarations, which covered every county in South Dakota. 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.

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.

NOAA storm event records in Hamlin County each year. The busiest year was 2010, with 37 records.

Years with no record are left out of the table, not shown as zero.

Costliest records

1. Flood · Apr 1, 2011$800K
   NOAA name: Hamlin County · NOAA record 300553
2. Thunderstorm Wind · Jun 21, 2013$215K
   NOAA name: Hamlin County · 1 death · 1 injury · NOAA record 464576
3. Flood · Apr 1, 2019$202K
   NOAA name: Hamlin County · NOAA record 820955
4. Flood · Apr 7, 2001$191K
   NOAA name: NWS forecast zone · NOAA record 5243757
5. Tornado · Oct 26, 1996$50K
   NOAA name: Hamlin County · NOAA record 5569241

Deadliest records

1. Dense Fog · Jan 18, 20103 deaths
   NOAA name: NWS forecast zone · NOAA record 211032
2. Winter Weather · Apr 15, 20112 deaths
   NOAA name: NWS forecast zone · NOAA record 302165
3. Thunderstorm Wind · Jun 21, 20131 death
   NOAA name: Hamlin County · $215K damage · 1 injury · NOAA record 464576
4. Heavy Snow · Mar 10, 20211 death
   NOAA name: NWS forecast zone · NOAA record 950931

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.

The National Flood Insurance Program paid $4.4M on 360 claims in Hamlin County from 1978 to 2020.

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.

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.

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 Hamlin 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.

• 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 Hamlin 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 569 records, 319 were filed against this county and 250 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.