South Dakota

Storm History: Dewey County, South Dakota

551 episodes, 814 events since 1953

Every storm the National Weather Service has filed in Dewey County, South 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
814
Deaths
3
Injuries
2
Damage
$4.3 million
Episodes
551

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 Dewey 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
Hail29300$5,000
Tornado11501$240,000
High Wind7600
Drought6400
Flash Flood4700
Thunderstorm Wind4500
Blizzard4401
Extreme Cold/Wind Chill3430
Heavy Snow2900
Flood2400$3.8 million
Winter Storm2100
Excessive Heat600$9,000
Wildfire400
Cold/Wind Chill300
Heat200
Ice Storm200$223,000
Strong Wind100
Lightning100
Winter Weather100
Funnel Cloud100
Dense Smoke100

The deadliest

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 Dewey County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Dewey CountyEvery warning in Dewey County since 1986Every county in South 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.