Iowa

Storm History: Jefferson County, Iowa

340 episodes, 450 events since 1957

Every storm the National Weather Service has filed in Jefferson 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
450
Deaths
0
Injuries
3
Damage
$49 million
Episodes
340

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 Jefferson 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
Hail8200$713,000
Tornado7803$28 million
Winter Storm6100
Flash Flood6000$531,000
Winter Weather2900$2,000
Thunderstorm Wind2300$100,000
Heavy Snow1800$10,000
Drought1700$18 million
Ice Storm1500$73,000
Flood1400$300,000
Blizzard1100
High Wind800$120,000
Dense Fog800
Extreme Cold/Wind Chill700
Frost/Freeze600$396,000
Cold/Wind Chill500
Heat400
Lightning200$20,000
Strong Wind100
Excessive Heat100

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 Jefferson County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Jefferson CountyEvery warning in Jefferson 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.