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Tornado History
Union Tornado History
This county-level tornado history page focuses on Union, South Dakota. The records below identify 23 tornadoes from 1954 through 2014, including a highest listed rating of F3 (Severe damage). NOAA damage estimates in this group total at least $3.0M, with 0 deaths and 0 injuries recorded across the listed events.
Key Tornado Statistics
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Check any addressKey Tornado Facts for Union, South Dakota
Top local patterns from the historical tornado records in this group.
Average 0.4 tornadoes per year (0.0/yr in last decade)
July is the peak tornado month with 8 recorded events
Deadliest tornado: F1 in Union, South Dakota with 0 deaths
1983 was the most active year with 4 tornadoes
The 1980s had the most tornado activity (7 events)
Longest tornado: 7 miles in Union, South Dakota
Widest tornado: 800.0 yards in Union, South Dakota
Most tornadoes in one day: 4 on Jul 22, 1983
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Union, South Dakota, July is the most active month with 8 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 1983 was the most active year with 4 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 1990 with at least $2.5M in NOAA-listed property damage.
Historical Track Sketch
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 7, 1965 | F3 | Union, South Dakota | 0 mi | 33 yd | 0 | 0 | N/A |
| July 7, 1987 | F2 | Union, South Dakota | 6 mi | 50 yd | 0 | 0 | N/A |
| June 16, 1990 | F1 | Union, South Dakota | 7 mi | 60 yd | 0 | 0 | $2.5M |
| October 4, 2013 | EF1 | Union, South Dakota | 4.18 mi | 400 yd | 0 | 0 | $250K |
| October 4, 2013 | EF1 | Union, South Dakota | 4.75 mi | 800 yd | 0 | 0 | $200K |
| May 27, 1954 | F1 | Union, South Dakota | 0 mi | 33 yd | 0 | 0 | $2K |
| May 8, 1964 | F1 | Union, South Dakota | 0 mi | 33 yd | 0 | 0 | $2K |
| July 22, 1983 | F1 | Union, South Dakota | 0.2 mi | 10 yd | 0 | 0 | $2K |
| August 12, 1985 | F1 | Union, South Dakota | 5 mi | 30 yd | 0 | 0 | $2K |
| May 11, 2014 | EF0 | Union, South Dakota | 2.4 mi | 50 yd | 0 | 0 | $20K |
| April 18, 2004 | F0 | Union, South Dakota | 4 mi | 100 yd | 0 | 0 | $10K |
| July 2, 1999 | F0 | Union, South Dakota | 0.5 mi | 50 yd | 0 | 0 | $5K |
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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.