Lewis County, ID
Hazard breakdown
| Hazard | NRI rating | NRI score | NOAA events (2016–2025) |
|---|---|---|---|
| Wildfire | Relatively Low | 85.9 | 0 |
| Inland Flooding | Very Low | 12 | 3 |
| Coastal Flooding | Not Applicable | — | 0 |
| Earthquake | Very Low | 23.4 | — |
| Heat Wave | Very Low | 19.3 | 0 |
| Tornado | Very Low | 2.8 | 0 |
NOAA event counts are recorded county-level storm events from the NOAA Storm Events Database for 2016–2025. NOAA does not track earthquakes, and some hazard reports are filed by NWS forecast zone rather than county, so these counts are a partial, not exhaustive, record of recent activity. See the methodology page for details.
Federal disaster declaration history
Lewis County has been included in 12 federal disaster declarations between 1965 and 2026, most recently for Straight-Line Winds in 2026 (STRAIGHT-LINE WINDS).
- Fire 3
- Flood 3
- Biological 2
- Severe Storm 2
- Hurricane 1
Source: FEMA OpenFEMA Disaster Declarations Summaries. Counts reflect county-level declaration records (a single disaster can produce more than one record per county), not modeled risk.
Geomagnetic latitude
Lewis County sits at approximately 52.5°N geomagnetic latitude. Aurora can become visible on the horizon here during geomagnetic storms reaching roughly Kp 7 or higher (G3 – Strong on NOAA's scale). See current space weather conditions for live geomagnetic activity and aurora forecasts.
Geomagnetic latitude is an approximate dipole-model calculation based on this county's geographic centroid (US Census Bureau). See the methodology page for details and limitations.
What these ratings mean
Each score reflects how Lewis County's expected losses from that hazard compare to every other county in the country, based on FEMA's National Risk Index. A "Very High" rating means this county is among the most exposed in the US for that hazard relative to other counties — it does not mean a disaster is likely this year. See the methodology page for how these scores are calculated.
- Very Low
- Relatively Low
- Relatively Moderate
- Relatively High
- Very High