Tornado History
Cass Tornado History
This county-level tornado history page focuses on Cass, North Dakota. The records below identify 109 tornadoes from 1950 through 2025, including a highest listed rating of F5 (Incredible damage). NOAA damage estimates in this group total at least $36.7M, with 13 deaths and 111 injuries recorded across the listed events.
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Key Tornado Statistics
Key Tornado Facts for Cass, North Dakota
Top local patterns from the historical tornado records in this group.
Average 1.4 tornadoes per year (1.5/yr in last decade)
July is the peak tornado month with 36 recorded events
Deadliest tornado: F5 in Cass, North Dakota with 10 deaths
2025 was the most active year with 10 tornadoes
The 2000s had the most tornado activity (24 events)
Longest tornado: 27.4 miles in Cass, North Dakota
Widest tornado: 1,351.0 yards in Cass, North Dakota
Most tornadoes in one day: 9 on Jun 20, 2025
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Cass, North Dakota, July is the most active month with 36 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 2025 was the most active year with 10 recorded tornadoes.
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.
Summary: The highest reported property damage year in this group is 1957 with at least $25.0M in NOAA-listed property damage.
Historical Track Sketch
This map covers the wider location—not your exact property.Measure the closest recorded track to a street address in or near Cass, North Dakota.
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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.
| Date | Rating | Area | Length | Width | Deaths | Injuries | Min. property damage |
|---|---|---|---|---|---|---|---|
| June 20, 1957 | F5 | Cass, North Dakota | 27.4 mi | 500 yd | 10 | 103 | $25.0M |
| June 20, 2025 | EF4 | Cass, North Dakota | 6.7 mi | 1000 yd | 3 | 0 | N/A |
| June 13, 1950 | F3 | Cass, North Dakota | 2 mi | 33 yd | 0 | 0 | $250K |
| August 30, 1956 | F3 | Cass, North Dakota | 5.1 mi | 60 yd | 0 | 8 | $250K |
| June 15, 1973 | F3 | Cass, North Dakota | 0 mi | 33 yd | 0 | 0 | $250K |
| July 15, 2007 | EF2 | Cass, North Dakota | 8 mi | 250 yd | 0 | 0 | $2.5M |
| May 30, 2011 | EF2 | Cass, North Dakota | 7.44 mi | 600 yd | 0 | 0 | $750K |
| May 30, 2011 | EF2 | Cass, North Dakota | 4 mi | 400 yd | 0 | 0 | $600K |
| July 18, 2004 | F2 | Cass, North Dakota | 4 mi | 100 yd | 0 | 0 | $500K |
| May 5, 1965 | F2 | Cass, North Dakota | 5.7 mi | 83 yd | 0 | 0 | $250K |
| May 5, 1965 | F2 | Cass, North Dakota | 8.5 mi | 83 yd | 0 | 0 | $250K |
| May 5, 1965 | F2 | Cass, North Dakota | 19.6 mi | 83 yd | 0 | 0 | $250K |
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Source And Limits
Data sourced from NOAA Storm Prediction Center and the NCEI Storm Events Database. TornadoTrace summarizes reported weather events for screening and research; it is not a damage assessment, inspection, or insurance determination. Coordinates and records can be approximate, incomplete, revised, or missing. No warranty of completeness or accuracy.