Tornado History Map

Lewis and Clark County, Montana tornado history

7 tornadoes recorded in or across Lewis and Clark County from 1953 to 1997, 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 Lewis and Clark County

The Storm Prediction Center records 7 tornadoes whose paths touched Lewis and Clark County, Montana between 1953 and 1997. None of them is recorded as having killed anyone. The busiest month is June, with 4 tornadoes. The strongest was an F2 on 2 July 1966. The most recent was on 27 June 1997.

  • 7tornadoes
  • 0deaths
  • 0injuries
  • 20per 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 Lewis and Clark County?

RatingTornadoesShare
F0 / EF0686%
F1 / EF100%
F2 / EF2114%
F3 / EF300%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Lewis and Clark County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 4 in 1990s.1950s11960s21990s4

The 1990s only run to 1997, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s1
1960s2
1990s4
Tornadoes by month
Bar chart of tornadoes by period. The most is 4 in Jun.Jan0Feb0Mar0Apr0May0Jun4Jul3Aug0Sep0Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr0
May0
Jun4
Jul3
Aug0
Sep0
Oct0
Nov0
Dec0

Records for Lewis and Clark County

  • Strongest: Montana tornado2 July 1966, F2, 0.8 miles long
  • Longest path: Montana tornado22 July 1960, F0, 1 mile long
  • Most recent: Montana tornado27 June 1997, F0, 0.1 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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