Iowa

Storm History: Union County, Iowa

374 episodes, 570 events since 1956

Every storm the National Weather Service has filed in Union 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
570
Deaths
0
Injuries
9
Damage
$187 million
Episodes
374

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 Union 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
Tornado18708$42 million
Hail9000$1.1 million
Flash Flood8200$2.1 million
Drought2700$110 million
Thunderstorm Wind2401$282,000
High Wind2400$945,000
Winter Storm2400$515,000
Heavy Snow2000$3.6 million
Flood1900$21 million
Blizzard1700$450,000
Ice Storm1500$445,000
Heavy Rain1000
Frost/Freeze800$4.0 million
Extreme Cold/Wind Chill800
Cold/Wind Chill700$294,000
Excessive Heat300$135,000
Funnel Cloud200
Lightning100$50,000
Heat100
Winter Weather100

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 Union County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Union CountyEvery warning in Union 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.