North Slope Borough
Alaska — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 15th
North Slope Borough faces very low composite natural disaster risk (NRI Risk Index score 14.8, 15th national percentile), driven primarily by cold wave and winter weather exposure. Expected annual loss across all 18 hazard types is $5M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Cold Wave | Medium | 9.97 / yr | $4M |
| Winter Weather | Medium | 20.10 / yr | $189K |
| Avalanche | Very Low | 0.01 / yr | $1K |
| Earthquake | Very Low | 0.03 / yr | $229K |
| Landslide | Very Low | 0.77 / yr | $44 |
| Wildfire | Very Low | 0.00 / yr | $3K |
| Ice Storm | Very Low | 0.01 / yr | $3K |
| Riverine Flood | Very Low | 0.04 / yr | $378K |
| Lightning | Very Low | 16.01 / yr | $3K |
| Tornado | Very Low | 0.00 / yr | $1 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Hail | Very Low | 0.00 / yr | $0 |
| Heat Wave | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Strong Wind | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for North Slope Borough?
North Slope Borough has a composite FEMA National Risk Index score of 14.8 out of 100, placing it in the Very Low category and the 15th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in North Slope Borough?
The three highest-rated hazards are Cold Wave (Medium, $4M EAL), Winter Weather (Medium, $189K EAL), Avalanche (Very Low, $1K EAL). These account for most of the county's expected annual losses.
How does North Slope Borough compare to other Alaska counties?
North Slope Borough ranks #20 of 30 Alaska counties for overall natural disaster risk, with a very low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. North Slope Borough's $5M EAL is a statistical average, not a guarantee for any specific year or address.