Tornado History
Grundy Tornado History
This county-level tornado history page focuses on Grundy, Iowa. The records below identify 40 tornadoes from 1960 through 2025, including a highest listed rating of F4 (Devastating damage). NOAA damage estimates in this group total at least $6.8M, with 0 deaths and 0 injuries recorded across the listed events.
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Key Tornado Statistics
Key Tornado Facts for Grundy, Iowa
Top local patterns from the historical tornado records in this group.
Average 0.6 tornadoes per year (0.7/yr in last decade)
May is the peak tornado month with 14 recorded events
Deadliest tornado: F3 in Grundy, Iowa with 0 deaths
2004 was the most active year with 5 tornadoes
The 2000s had the most tornado activity (15 events)
Longest tornado: 30.3 miles in Grundy, Iowa
Widest tornado: 875.0 yards in Grundy, Iowa
Most tornadoes in one day: 5 on May 21, 2004
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Grundy, Iowa, May is the most active month with 14 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 2004 was the most active year with 5 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 1989 with at least $2.5M 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 Grundy, Iowa.
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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 |
|---|---|---|---|---|---|---|---|
| May 30, 1989 | F4 | Grundy, Iowa | 2 mi | 200 yd | 0 | 0 | $2.5M |
| April 16, 1960 | F3 | Grundy, Iowa | 2.3 mi | 800 yd | 0 | 0 | $250K |
| May 25, 2008 | EF2 | Grundy, Iowa | 1.09 mi | 75 yd | 0 | 0 | $300K |
| March 22, 1991 | F2 | Grundy, Iowa | 19 mi | 50 yd | 0 | 0 | $250K |
| May 10, 2001 | F2 | Grundy, Iowa | 1.7 mi | 200 yd | 0 | 0 | $150K |
| July 2, 1999 | F2 | Grundy, Iowa | 8.5 mi | 50 yd | 0 | 0 | $75K |
| May 10, 2001 | F2 | Grundy, Iowa | 4 mi | 875 yd | 0 | 0 | $35K |
| April 19, 1966 | F2 | Grundy, Iowa | 2.3 mi | 200 yd | 0 | 0 | $25K |
| October 14, 1966 | F2 | Grundy, Iowa | 2.7 mi | 100 yd | 0 | 0 | $2K |
| June 28, 1990 | F1 | Grundy, Iowa | 5.5 mi | 30 yd | 0 | 0 | $2.5M |
| November 9, 1975 | F1 | Grundy, Iowa | 0 mi | 300 yd | 0 | 0 | $250K |
| July 6, 2014 | EF1 | Grundy, Iowa | 3.21 mi | 100 yd | 0 | 0 | $200K |
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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.