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Tornado History

Cass Tornado History

This county-level tornado history page focuses on Cass, Minnesota. The records below identify 27 tornadoes from 1964 through 2025, including a highest listed rating of F4 (Devastating damage). NOAA damage estimates in this group total at least $10.3M, with 13 deaths and 75 injuries recorded across the listed events.

Key Tornado Statistics

Total Tornadoes27
Total Deaths13
Total Injuries75
Property Damage$10.3M
Avg Length4.5 mi
Avg Width158 yd

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Key Tornado Facts for Cass, Minnesota

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

Average 0.4 tornadoes per year (0.7/yr in last decade)
August is the peak tornado month with 10 recorded events
Deadliest tornado: F4 in Cass, Minnesota with 12 deaths
1977 was the most active year with 3 tornadoes
The 1970s had the most tornado activity (6 events)
Longest tornado: 21.5 miles in Cass, Minnesota
Widest tornado: 833.0 yards in Cass, Minnesota
Most tornadoes in one day: 3 on Jul 5, 1991

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 Cass, Minnesota, August is the most active month with 10 tornadoes.

Annual Tornado Trend

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

3210

Summary: 1977 was the most active year with 3 recorded tornadoes.

Tornado Intensity Distribution

Shows the breakdown of tornadoes by EF/F rating.

F0
EF0
F1
EF1
F2
F3
F4

Summary: F1 tornadoes are the most common in this group, with 8 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.

$5.0M$500K$50K$0

Summary: The highest reported property damage year in this group is 1969 with at least $5.0M in NOAA-listed property damage.

Historical Track Sketch

F4 August 6, 19691969F3 August 6, 19691969F3 August 26, 19771977F3 July 5, 19911991F2 August 26, 19771977F2 July 5, 19911991F1 August 2, 19811981EF1 May 30, 20222022F1 June 14, 19671967F1 July 2, 19751975F1 July 22, 19761976F1 September 9, 19641964F1 August 18, 19821982F1 June 27, 19771977F1 July 5, 1991EF1 August 29, 2013EF1 May 30, 2022EF1 June 16, 2025F0 July 14, 1968EF0 June 17, 2010F0 July 12, 1978F0 June 28, 2003EF0 May 25, 2008EF0 June 19, 2016EF0 August 3, 2017EF0 August 3, 2017EF0 August 3, 2017© 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
August 6, 1969F4Cass, Minnesota12.3 mi833 yd1270$2.5M
August 6, 1969F3Cass, Minnesota17.3 mi167 yd04$2.5M
August 26, 1977F3Cass, Minnesota8.9 mi400 yd00$2.5M
July 5, 1991F3Cass, Minnesota1 mi43 yd00N/A
August 26, 1977F2Cass, Minnesota21.5 mi33 yd00$25K
July 5, 1991F2Cass, Minnesota2.5 mi13 yd00N/A
August 2, 1981F1Cass, Minnesota0.5 mi400 yd00$2.5M
May 30, 2022EF1Cass, Minnesota0.48 mi50 yd00$150K
June 14, 1967F1Cass, Minnesota0.5 mi33 yd00$25K
July 2, 1975F1Cass, Minnesota0 mi400 yd00$25K
July 22, 1976F1Cass, Minnesota4.5 mi50 yd01$25K
September 9, 1964F1Cass, Minnesota0.3 mi200 yd00$2K

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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.