Tornado History Map

Clay County, Iowa tornado history

40 tornadoes recorded in or across Clay County from 1954 to 2014, coloured by rating on the map.

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Years1950 to 2025
Rating (F or EF scale)

Shows tornadoes that started in, or crossed, the chosen state. To see how many have passed near you, search a town or ZIP code, or tap the map.

Key
  • F0 / EF0 Light damage
  • F1 / EF1 Moderate damage
  • F2 / EF2 Considerable damage
  • F3 / EF3 Severe damage
  • F4 / EF4 Devastating damage
  • F5 / EF5 Incredible damage
  • Unknown Not rated (2007 onwards)

How to read the lines. Each line is one tornado, drawn from where it started to where it ended, coloured and sized by its rating. A dot means the record has no end point. Tap a line for its details, or tap anywhere else to see how many tornadoes have passed nearby. Weaker tornadoes appear as you zoom in. Ratings use the Fujita (F) scale before 1 February 2007 and the Enhanced Fujita (EF) scale from then on.

Tornadoes in Clay County

The Storm Prediction Center records 40 tornadoes whose paths touched Clay County, Iowa between 1954 and 2014. None of them is recorded as having killed anyone. The busiest month is June, with 19 tornadoes. The strongest was an F3 on 1 October 1971. The most recent was on 19 June 2014.

  • 40tornadoes
  • 0deaths
  • 0injuries
  • 705per 10,000 sq mi of land

A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.

How strong were the tornadoes in Clay County?

RatingTornadoesShare
F0 / EF01640%
F1 / EF11435%
F2 / EF2718%
F3 / EF338%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Clay County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 17 in 2000s.1950s61960s11970s21980s61990s22000s172010s6

The 2010s only run to 2014, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s6
1960s1
1970s2
1980s6
1990s2
2000s17
2010s6
Tornadoes by month
Bar chart of tornadoes by period. The most is 19 in Jun.Jan0Feb0Mar1Apr4May7Jun19Jul3Aug2Sep2Oct2Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar1
Apr4
May7
Jun19
Jul3
Aug2
Sep2
Oct2
Nov0
Dec0

Records for Clay County

  • Strongest: Iowa tornado1 October 1971, F3, 11.2 miles long
  • Longest path: Iowa tornado11 June 2008, EF2, 13.1 miles long
  • Most recent: Iowa tornado19 June 2014, EF0, 0.2 miles long

Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.

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