South Dakota

Storm History: Gregory County, South Dakota

581 episodes, 751 events since 1952

Every storm the National Weather Service has filed in Gregory 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
751
Deaths
0
Injuries
10
Damage
$40 million
Episodes
581

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 Gregory 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
Hail24400$4.9 million
Tornado89010$11 million
High Wind6100$177,000
Drought5400$14 million
Blizzard4800$281,000
Winter Storm4800$40,000
Winter Weather4500
Thunderstorm Wind4400$60,000
Flash Flood3300$672,000
Excessive Heat2200
Heavy Snow1600
Extreme Cold/Wind Chill1300
Cold/Wind Chill1000
Flood900$7.9 million
Heat500
Ice Storm400$1.0 million
Strong Wind300
Wildfire200
Lightning100

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 Gregory County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Gregory CountyEvery warning in Gregory 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.