Slope County, North Dakota tornadoes

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11confirmed tornadoes since NOAA records began in 1950 (the first here in 1960). Most recent: September 9, 2010, EF0. 2026 so far: 0 preliminary reports preliminary

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Map

Every tornado path in the county

Tornado paths, 1950 to 2025
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(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5Unrated

Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.

The record

At a glance

Total111950 to 2025
Per year0.1average since 1950
Peak monthJuly4 of 11
StrongestF1Aug 6, 1960
Deaths0whole paths, see note
Injuries0whole paths, see note

Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Slope County.

Seasons

When tornadoes hit here

By month

40 Jan: 0Feb: 0Mar: 0Apr: 0May: 2Jun: 3Jul: 4Aug: 1Sep: 1Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

July is the peak month, with 4 of 11 tornadoes.

By time of day

30 12 AM: 0: 0: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 012 PM: 0: 0: 13 PM: 0: 2: 26 PM: 1: 1: 39 PM: 1: 0: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 8:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

20 1950: 0: 0: 0: 0: 0: 0: 0: 0: 0: 01960: 1: 0: 0: 0: 0: 1: 0: 0: 0: 01970: 0: 0: 1: 0: 0: 0: 0: 0: 0: 01980: 0: 0: 0: 2: 0: 0: 0: 0: 0: 01990: 0: 2: 0: 0: 0: 0: 0: 0: 0: 12000: 0: 1: 0: 0: 0: 0: 0: 0: 0: 02010: 2: 0: 0: 0: 0: 0: 0: 0: 0: 02020: 0: 0: 0: 0: 0: 019501960197019801990200020102020

The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.

By rating

EF0
7
EF1
4

Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.

The record

Notable tornadoes

Strongest

F1, August 6, 1960

0.1 mile path Longest path

15.5 miles, F1

May 19, 1972, whole path Widest

50 yards, F1

May 19, 1972
Every tornado

All 11 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Sep 9, 2010EF00.82 mi40 yd00
Jul 26, 2010EF05.34 mi30 yd00
Jul 3, 2001F09 mi40 yd00
Jun 20, 1999F03 min/a00
Jun 8, 1991F00.1 mi10 yd00
Jun 8, 1991F10.1 mi10 yd00
Jul 17, 1983F00.3 mi10 yd00
Jul 17, 1983F00.3 mi10 yd00
May 19, 1972F115.5 mi50 yd00
May 23, 1965F10.1 mi10 yd00
Aug 6, 1960F10.1 mi10 yd00
Nearby

Nearby counties

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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 12, 2026.