California

Storm History: Contra Costa County, California

186 episodes, 477 events since 1983

Every storm the National Weather Service has filed in Contra Costa County, California: floods, hail, damaging wind, tornadoes, winter storms, heat and the rest, with the most serious on record. Events filed by forecast zone count for every county the zone covers.

The record

Events
477
Deaths
15
Injuries
27
Damage
$65 million
Episodes
186

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Open the live radar over Contra Costa County

Every year

From 1996 the record holds 48 kinds of event with each office’s narrative; before that, tornadoes, hail and thunderstorm wind only, and before 1955 tornadoes alone.

By kind of event

Counted under the kind that heads each episode.

Kind of eventEventsDeathsInjuriesDamage
Debris Flow9814$11 million
High Wind7133$1.9 million
Flash Flood6920$4.7 million
Flood4823$45 million
Wildfire4620$104,000
Strong Wind4305$1.2 million
Heat28212$30,000
Dense Fog1900
Tornado1310$425,000
Hail900
Excessive Heat700
Dense Smoke600
Coastal Flood600
Heavy Rain400$105,000
Frost/Freeze300$400,000
Storm Surge/Tide200$160,000
Cold/Wind Chill220
Winter Weather100
High Surf100$10,000
Tsunami100$50,000

The deadliest

The costliest

Damage within this county, in the dollars of its year.

The largest hail

The largest stone in each episode, which may have fallen in a neighboring county of the same episode.

Every episode, newest first

More

Tornadoes in Contra Costa CountyEvery warning in Contra Costa County since 1986Every county in California

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.