Slope County, North Dakota: Natural Disaster Risk and History
Slope County, North Dakota has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 0.6 out of 100, among the lowest of all US counties, with wildfires, cold waves and drought scoring highest of its 18 hazards and $1.1 million a year in expected losses.
OpenFEMA lists 8 federal disaster declarations that included Slope County since 1978, not counting 2 for COVID-19; the latest is DR-4154-ND (Severe Winter Storm, declared 31 October 2013). NOAA's Storm Prediction Center recorded 11 tornadoes touching Slope County from 1950 to 2025.
Live weather alerts for North Dakota All official warnings Latest FEMA declarations
Population 699 Buildings worth $246 million Area 1,232 sq mi Risk rank in North Dakota 53 of 53 FIPS 38087
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Wildfire | Very Low | 38.0 | $27,913 | rarer than once in 1,000 years | — |
| Cold wave | Relatively Low | 32.9 | $597,348 | about 12 a year | 218 |
| Drought | Very Low | 23.9 | $12,005 | about 29 a year | 728 |
| Hail | Very Low | 21.6 | $96,458 | about 2.4 a year | 93 |
| Winter weather | Very Low | 21.2 | $23,171 | about 17 a year | 330 |
| Ice storm | Very Low | 14.3 | $11,027 | about once every 2.3 years | 30 |
| Heat wave | Very Low | 14.2 | $39,851 | about once a year | 17 |
| Landslide | Very Low | 8.0 | $21 | about once every 3.0 years | — |
| Strong wind | Very Low | 7.7 | $70,353 | about 1.5 a year | 58 |
| Tornado | Very Low | 5.5 | $29,202 | about once every 5.5 years | 8 |
| Lightning | Very Low | 1.6 | $6,765 | about 32 a year | 29,706 strikes |
| Inland flooding | Very Low | 0.6 | $219,920 | about once every 28 years | 1 |
| Earthquake | Very Low | 0.6 | $861 | rarer than once in 1,000 years | — |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 8
Most common: Severe Storm 3, Snowstorm 2, Flood 2, Coastal Storm 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 2 | Flood, Snowstorm |
| 1990s | 2 | Flood, Severe Storm |
| 2000s | 2 | Snowstorm, Coastal Storm |
| 2010s | 2 | Severe Storm ×2 |
The last 8
Widest declarations that included Slope County
- Hurricane Katrina Evacuation (2005, EM-3247-ND): 53 North Dakota counties designated.
- Severe Flooding,severe Winter Storms, Snowmelt, Spring Rains (1997, DR-1174-ND): 53 North Dakota counties designated.
- Severe Winter Storms and Blizzard Conditions (1997, DR-1157-ND): 53 North Dakota counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. North Dakota also had 2 statewide declarations with no county list.
Tornado record since 1950 11
| Tornadoes touching the county | 11 |
|---|---|
| Strongest-rated | (E)F1 ×4 |
| Peak month | July (4) |
| Deadliest | — |
| Longest path | 19 May 1972, F1, 15.5 mi path |
| Most recent | 9 Sep 2010, EF0, 0.8 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 7 | 4 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 2 | 1 | 2 | 3 | 1 | 2 | 0 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Slope County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Slope County (this page) | — | Very Low | 0.6 | Wildfire |
| Bowman County | 37 km | Very Low | 2.1 | Winter weather |
| Golden Valley County | 62 km | Very Low | 13.1 | Cold wave |
| Billings County | 64 km | Very Low | 0.9 | Wildfire |
| Stark County | 74 km | Very Low | 37.3 | Winter weather |
| Fallon County, MT | 75 km | Very Low | 5.4 | Cold wave |
Nearest by distance between county centres. Every county in North Dakota, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 14.1 |
|---|---|
| Community resilience | Very Low 3.5 |
| Community risk factor | 0.84 |
| Expected annual loss, all hazards | $1.1 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Slope County's main hazards
- Right now: National Weather Service alerts for North Dakota · all official warnings on Global Incident Tracker.
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Cold wave: Carbon monoxide in winter · Power outages now
- Drought: Drought monitor for North Dakota
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Slope County
What natural disasters is Slope County, North Dakota most at risk from?
Slope County, North Dakota has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 0.6 out of 100, among the lowest of all US counties, with wildfires, cold waves and drought scoring highest of its 18 hazards and $1.1 million a year in expected losses.
How many federal disaster declarations has Slope County had?
OpenFEMA lists 8 federal disaster declarations that included Slope County since 1978, not counting 2 for COVID-19; the latest is DR-4154-ND (Severe Winter Storm, declared 31 October 2013). Another 2 North Dakota declarations were made statewide without a county list.
How many tornadoes have hit Slope County?
NOAA's Storm Prediction Center recorded 11 tornadoes touching Slope County from 1950 to 2025.
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.