North Dakota

Storm History: Slope County, North Dakota

330 episodes, 391 events since 1960

Every storm the National Weather Service has filed in Slope County, North Dakota: floods, hail, damaging wind, tornadoes, winter storms, heat and the rest, with the most serious on record. Events filed by forecast zone count for every county the zone covers.

The record

Events
391
Deaths
0
Injuries
0
Damage
$6.9 million
Episodes
330

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Open the live radar over Slope County

Every year

From 1996 the record holds 48 kinds of event with each office’s narrative; before that, tornadoes, hail and thunderstorm wind only, and before 1955 tornadoes alone.

By kind of event

Counted under the kind that heads each episode.

Kind of eventEventsDeathsInjuriesDamage
Hail10000$1.4 million
High Wind7400$20,000
Tornado4900$113,000
Blizzard4800$4.2 million
Heavy Snow2200
Drought2200
Winter Storm2100
Thunderstorm Wind1500$250,000
Extreme Cold/Wind Chill1300
Cold/Wind Chill800
Flash Flood700
Wildfire400$100,000
Winter Weather300
Flood100$100,000
Heavy Rain100
Excessive Heat100$700,000
Dense Smoke100
Dust Storm100

The deadliest

None recorded.

The costliest

Damage within this county, in the dollars of its year.

The largest hail

The largest stone in each episode, which may have fallen in a neighboring county of the same episode.

The strongest tornadoes

Every tornado in Slope County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Slope CountyEvery warning in Slope County since 1986Every county in North Dakota

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.