Tornado History Map

Dewey County, South Dakota tornado history

32 tornadoes recorded in or across Dewey County from 1953 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 Dewey County

The Storm Prediction Center records 32 tornadoes whose paths touched Dewey County, South Dakota between 1953 and 2014. None of them is recorded as having killed anyone. The busiest month is June, with 13 tornadoes. The strongest was an F2 on 2 June 1953. The most recent was on 21 June 2014.

  • 32tornadoes
  • 0deaths
  • 3injuries
  • 139per 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 Dewey County?

RatingTornadoesShare
F0 / EF02578%
F1 / EF139%
F2 / EF2413%
F3 / EF300%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Dewey County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 8 in 2000s.1950s41960s61970s31980s21990s72000s82010s2

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

Show the numbers
PeriodCount
1950s4
1960s6
1970s3
1980s2
1990s7
2000s8
2010s2
Tornadoes by month
Bar chart of tornadoes by period. The most is 13 in Jun.Jan0Feb0Mar0Apr3May8Jun13Jul5Aug2Sep1Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr3
May8
Jun13
Jul5
Aug2
Sep1
Oct0
Nov0
Dec0

Records for Dewey County

  • Strongest: South Dakota tornado2 June 1953, F2, 5.9 miles long
  • Longest path: South Dakota tornado10 July 1977, F1, 16 miles long
  • Most recent: South Dakota tornado21 June 2014, EF0, 0.3 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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