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Tornado History

Contra Costa Tornado History

This county-level tornado history page focuses on Contra Costa, California. The records below identify 5 tornadoes from 1989 through 2010, including a highest listed rating of EF1 (Moderate damage). NOAA damage estimates in this group total at least $275K, with 0 deaths and 0 injuries recorded across the listed events.

Key Tornado Statistics

Total Tornadoes5
Total Deaths0
Total Injuries0
Property Damage$275K
Avg Length0.7 mi
Avg Width40 yd

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Key Tornado Facts for Contra Costa, California

Top local patterns from the historical tornado records in this group.

Average 0.2 tornadoes per year (0.0/yr in last decade)
September is the peak tornado month with 2 recorded events
Deadliest tornado: F0 in Contra Costa, California with 0 deaths
1989 was the most active year with 2 tornadoes
The 1980s had the most tornado activity (2 events)
Longest tornado: 1.64 miles in Contra Costa, California
Widest tornado: 150.0 yards in Contra Costa, California
Most tornadoes in one day: 2 on Sep 18, 1989

Monthly Distribution

Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.

January
February
March
April
May
June
July
August
September
October
November
December

Summary: In Contra Costa, California, September is the most active month with 2 tornadoes.

Annual Tornado Trend

Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.

20

Summary: 1989 was the most active year with 2 recorded tornadoes.

Tornado Intensity Distribution

Shows the breakdown of tornadoes by EF/F rating.

F0
EF1

Summary: F0 tornadoes are the most common in this group, with 4 recorded events.

Property Damage Trends

Visualizes reported property damage over time. Bars use a log-like scale so very large damage years do not flatten the rest of the chart.

$250K$25K$2K$0

Summary: The highest reported property damage year in this group is 1998 with at least $250K in NOAA-listed property damage.

Historical Track Sketch

EF1 January 23, 20102010F0 December 5, 19981998F0 February 19, 19981998F0 September 18, 19891989F0 September 18, 19891989© OpenStreetMap contributors

Notable Tornado Records

The table highlights the strongest and most damaging records in this page's local dataset. Damage totals are NOAA-reported minimum estimates where available.

DateRatingAreaLengthWidthDeathsInjuriesMin. property damage
January 23, 2010EF1Contra Costa, California1.64 mi2 yd00$25K
December 5, 1998F0Contra Costa, California1.5 mi150 yd00$200K
February 19, 1998F0Contra Costa, California0.2 mi30 yd00$50K
September 18, 1989F0Contra Costa, California0.2 mi10 yd00N/A
September 18, 1989F0Contra Costa, California0.2 mi10 yd00N/A

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Source And Limits

Data source: NOAA/NCEI. TornadoTrace summarizes historical records for screening and research. Coordinates, damage estimates, narratives, and event details can be approximate, incomplete, revised, or missing. Do not use this page as legal, insurance, engineering, real estate, emergency management, or safety advice.