Illinois

Storm History: Winnebago County, Illinois

517 episodes, 888 events since 1958

Every storm the National Weather Service has filed in Winnebago County, Illinois: 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
888
Deaths
7
Injuries
15
Damage
$41 million
Episodes
517

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 Winnebago 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
Tornado20728$2.9 million
Hail17001$134,000
Thunderstorm Wind11913$5.1 million
Flash Flood11703$26 million
Flood8510$6.0 million
Winter Storm4100
High Wind2800$146,000
Drought2500
Extreme Cold/Wind Chill1600
Winter Weather1400
Ice Storm1100
Heavy Snow1000
Cold/Wind Chill900
Excessive Heat700
Dust Storm700
Strong Wind600$25,000
Blizzard500
Lightning300$10,000
Heat330
Heavy Rain200
Funnel Cloud200
Frost/Freeze100

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 Winnebago County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Winnebago CountyEvery warning in Winnebago County since 1986Every county in Illinois

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.