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Tornado History

Grundy Tornado History

This county-level tornado history page focuses on Grundy, Iowa. The records below identify 37 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.

Key Tornado Statistics

Total Tornadoes37
Total Deaths0
Total Injuries0
Property Damage$6.8M
Avg Length3.3 mi
Avg Width110 yd

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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 12 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.

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

Summary: In Grundy, Iowa, May is the most active month with 12 tornadoes.

Annual Tornado Trend

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

5420

Summary: 2004 was the most active year with 5 recorded tornadoes.

Tornado Intensity Distribution

Shows the breakdown of tornadoes by EF/F rating.

F0
EF0
F1
EF1
F2
EF2
F3
F4
Unknown
EFU

Summary: F1 tornadoes are the most common in this group, with 7 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.

$2.5M$250K$25K$0

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

F4 May 30, 19891989F3 April 16, 19601960EF2 May 25, 20082008F2 March 22, 19911991F2 May 10, 20012001F2 July 2, 19991999F2 May 10, 20012001F2 October 14, 19661966F1 June 28, 19901990F1 November 9, 19751975EF1 July 6, 20142014F1 May 10, 20012001EF1 March 31, 20232023EF1 March 31, 20232023EF1 June 29, 2014F1 July 2, 1973F1 July 6, 1977EF1 June 21, 2009EF1 June 21, 2009F1 May 21, 2004F1 July 14, 1987F0 April 18, 2002EF0 May 25, 2008F0 May 11, 2000F0 May 21, 2004F0 May 21, 2004F0 May 21, 2004F0 May 21, 2004EF0 June 21, 2009EF0 July 6, 2014EF0 August 31, 2014EF0 November 28, 2016EF0 November 28, 2016Unknown July 7, 1978EFU August 18, 2025EFU August 18, 2025EFU August 18, 2025© 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
May 30, 1989F4Grundy, Iowa2 mi200 yd00$2.5M
April 16, 1960F3Grundy, Iowa2.3 mi800 yd00$250K
May 25, 2008EF2Grundy, Iowa1.09 mi75 yd00$300K
March 22, 1991F2Grundy, Iowa19 mi50 yd00$250K
May 10, 2001F2Grundy, Iowa1.7 mi200 yd00$150K
July 2, 1999F2Grundy, Iowa8.5 mi50 yd00$75K
May 10, 2001F2Grundy, Iowa4 mi875 yd00$35K
October 14, 1966F2Grundy, Iowa2.7 mi100 yd00$2K
June 28, 1990F1Grundy, Iowa5.5 mi30 yd00$2.5M
November 9, 1975F1Grundy, Iowa0 mi300 yd00$250K
July 6, 2014EF1Grundy, Iowa3.21 mi100 yd00$200K
May 10, 2001F1Grundy, Iowa1 mi100 yd00$50K

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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.