Iowa

Storm History: Harrison County, Iowa

522 episodes, 698 events since 1959

Every storm the National Weather Service has filed in Harrison County, Iowa: 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
698
Deaths
2
Injuries
20
Damage
$73 million
Episodes
522

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 Harrison 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
Hail19100$203,000
Tornado147219$20 million
Thunderstorm Wind11501$467,000
Winter Storm5100
Cold/Wind Chill3700
Flash Flood2600$3.1 million
Blizzard2300
High Wind2200
Flood1700$48 million
Heat1200
Winter Weather1200
Excessive Heat1200
Extreme Cold/Wind Chill1100
Drought1000
Heavy Snow400$900,000
Ice Storm400
Heavy Rain300
Funnel Cloud100

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 Harrison County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Harrison CountyEvery warning in Harrison County since 1986Every county in Iowa

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.