States › Alaska › North Slope Borough
North Slope Borough, Alaska
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 1 Oct 2026; NFIP claims as of 8 Sep 2026.
Between 1950 and 2026, NCEI recorded 2 storm events in North Slope Borough, Alaska, led by floods and flash floods.
That is 0.0 events per 100 square miles, below the Alaska figure of 1.7, and 1.8 per 10,000 residents against 132.4 statewide.
0 events fall in the 12 months to 30 Jun 2026. NCEI attributes 0 deaths and 0 injuries to events in the county, with property damage estimated at $0.
FEMA has designated the county in 8 federal disaster declarations since 1953; the most recent is Covid-19 Pandemic (major disaster, 9 Apr 2020).
National Flood Insurance Program policyholders in the county filed 1 claim since 1978, of which 1 were paid, totalling $56K (about $56K per paid claim). FEMA counts 1 residential flood policies in force.
FEMA's National Risk Index rates the county's overall risk as "Very Low" and its expected annual loss as "Very Low" ($4.9M a year across 18 hazards).
Compared with Alaska and the United States
| Measure | North Slope Borough | Alaska | US |
|---|---|---|---|
| Recorded events since 1950 | 2 | 9,701 | 1,977,440 |
| Events per 100 square miles | 0.0 | 1.7 | 56.0 |
| Events per 10,000 residents | 1.8 | 132.4 | 59.6 |
| Events in the last 12 months | 0 | 326 | 62,008 |
| Deaths recorded by NCEI | 0 | 100 | 26,435 |
| Property damage (NCEI estimates) | $0 | $475M | $575B |
| NFIP claims per 1,000 residents | 0.1 | 1.1 | 8.1 |
| Average paid NFIP claim | $56K | $30K | $43K |
| Claims per 100 policies in force, last 10 years | 0.0 | 5.8 | 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: 2 events in the 20 years to 2025 against 0 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 | Events | Deaths | Share of state's events | |
|---|---|---|---|---|
| ■ Flood | 1 | — | 0.2% | |
| ■ Other | 1 | — | 0.6% |
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
NCEI records no event with deaths, injuries or damage of $100,000 or more in the county.
Federal disaster declarations
| Declared | Number | Type | Incident | Title | Programs |
|---|---|---|---|---|---|
| 9 Apr 2020 | DR-4533 | Major disaster | Biological | Covid-19 Pandemic | Individual assistance, Public assistance |
| 13 Mar 2020 | EM-3446 | Emergency | Biological | Covid-19 | Public assistance |
| 20 Dec 2017 | DR-4351 | Major disaster | Severe Storm | Severe Storm | Public assistance |
| 30 Oct 2015 | DR-4244 | Major disaster | Coastal Storm | Severe Storm | Public assistance |
| 22 Dec 2011 | DR-4050 | Major disaster | Severe Storm | Severe Winter Storms And Flooding | Public assistance |
| 26 Sep 2008 | DR-1796 | Major disaster | Severe Storm | Severe Storms, Flooding, Landslides, And Mudslides | Public assistance |
| 14 Mar 2005 | DR-1584 | Major disaster | Severe Storm | Severe Winter Storm | Public assistance |
| 27 Oct 1986 | DR-781 | Major disaster | Flood | Coastal Storm, High Winds & Waves | 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
| Year of loss | Claims | Paid claims | Amount paid | Average paid |
|---|---|---|---|---|
| 2013 | 1 | 1 | $55,782 | $55,782 |
OpenFEMA NFIP claims (v3, as of 8 Sep 2026), aggregated by year of loss; amounts are building, contents and increased-cost-of-compliance payments as recorded. Repetitive-loss counts from the NFIP Multiple Loss Properties file (2 Aug 2026); policies in force from the NFIP Residential Penetration Rates file (3 Aug 2026).
National Risk Index
| Hazard (NRI) | Risk rating | Expected annual loss |
|---|---|---|
| Cold wave | $4,096,875 | |
| Inland flooding | $377,865 | |
| Earthquake | $228,770 | |
| Winter weather | $189,379 | |
| Lightning | $3,151 | |
| Wildfire | $3,078 | |
| Ice storm | $2,762 | |
| Avalanche | $1,223 | |
| Landslide | $44 | |
| Tornado | $1 |
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
No HURDAT2 track at tropical-storm strength passes within 100 miles of the county's centre point (through the 2025 season).
Questions and answers
How often does it hail in North Slope Borough, AK?
NCEI records no hail events in North Slope Borough since 1950. Reports depend on someone observing and reporting the hail, so absence of a record is not proof of absence.
Has North Slope Borough had a tornado?
NCEI records no tornado in North Slope Borough since 1950.
When was the last federal disaster declaration for North Slope Borough?
9 Apr 2020: Covid-19 Pandemic, a major disaster declaration for biological. The county appears in 8 declarations since 1953.
How many flood insurance claims have been filed in North Slope Borough, and how much was paid?
1 NFIP claim since 1978, 1 of them paid, for $56K in total. FEMA publishes these figures redacted and aggregated; individual properties are not identified.
Is North Slope Borough 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 Moderate" for social vulnerability and "Very Low" for community resilience. These ratings are FEMA's relative comparison across all US counties.
How does North Slope Borough compare with the rest of Alaska?
0.0 recorded events per 100 square miles against 1.7 statewide, and 0.1 NFIP claims per 1,000 residents against 1.1. 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 1 Oct 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 1 Oct 2026; see the methodology and corrections pages. Hazard hubs: Hail · Tornado · Flood · Wind · Winter.