SkyGround

County-level natural hazard risk data for researchers

All counties

Suffolk County, MA

Population: 796,326 · FIPS code: 25025

Relatively Moderate Overall risk index: 93.5 / 100 (percentile among US counties)

Hazard breakdown

Hazard NRI rating NRI score NOAA events
(2016–2025)
Wildfire Very Low 9 0
Inland Flooding Relatively High 94.7 51
Coastal Flooding Relatively High 92.2 0
Earthquake Relatively Moderate 95 —
Heat Wave Relatively High 97.5 0
Tornado Relatively Moderate 75.3 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

Suffolk County has been included in 38 federal disaster declarations between 1972 and 2023, most recently for Hurricane in 2023 (HURRICANE LEE).

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

Suffolk County sits at approximately 51.6°N geomagnetic latitude. Aurora can become visible on the horizon here during geomagnetic storms reaching roughly Kp 8 or higher (G4 – Severe 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 Suffolk 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.