Napa County, California

What hazards hit Napa County most?

The most frequent records are high wind and dust records: 298 since 1998. The rank column places the county among California's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Napa County had?

NOAA records 1 tornado in Napa County from 2016 to 2016, the strongest rated EF0, with 0 deaths and 0 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 1 tornado whose track touched Napa County since 1950 (NOAA's county records number 1, the same count); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in California.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Napa County?

The most recent record with damage, injuries or deaths is the May 17, 2026 strong wind (1 injury).

A 23-year old woman was hit by a fallen branch on the 300 block of Steele Lane in Santa Rosa. She was taken to the hospital for treatment. Around the time of the incident, wind gusts of 25 to 40 miles per hour were reported in a couple of stations within Santa Rosa.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1324646)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Napa County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

High wind and dust storms in the 2010s: 174 records against 34 in the decade before, 174 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Napa County days with a record above.

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

Records by month in Napa County. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Napa County

FEMA's register lists 39 declarations that include Napa County: 24 major disasters, 6 emergencies and 9 fire management assistance declarations. Most were for fire (13) and severe storm (10).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Napa County had?

NOAA's Storm Events Database holds 70 flood or flash flood records for Napa County from 1996 to 2026, on 53 days, with 1 death. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Napa County ranks 262nd of 2,942 U.S. counties.

The National Flood Insurance Program has paid $29.8 million on 1,361 claims filed in Napa County; the most in one year was 446 in 1995. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Napa County

FEMA's National Risk Index rates Napa County Relatively High overall, with an expected annual loss of $186 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Napa County

1. Sonoma County 1,017
2. Napa County 511
3. Solano County 388
4. Yolo County 308
5. Lake County 256

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in CaliforniaEvery California tornado since 1950 and the counties with the most per square mile
• High wind and dust storms in CaliforniaThe state's high wind and dust records, by county, year and month
• The California recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Napa CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Napa County's FEMA declarations (CSV)39 rows: every declaration that named the county, for your own analysis