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Tornado in Lake County, Illinois
23 tornadoes events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Tornado.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 23 tornado events in Lake County, Illinois, between 1950 and 2026, spread over 20 years.
April is the busiest month, with 7 of the recorded events. The last 20 years account for 7 events against 4 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.6% of the 3,647 tornado events recorded in Illinois; its 5.2 per 100 square miles compares with 6.6 statewide.
NCEI attributes 1 death in the county to tornadoes.
By rating: 6 at (E)F0, 9 at (E)F1, 5 at (E)F2, 0 at (E)F3, 3 at (E)F4, 0 at (E)F5. Tornadoes before 2007 carry the original Fujita rating.
Compared with Illinois
| Measure | Lake County | Illinois | US |
|---|---|---|---|
| Tornado events since 1950 | 23 | 3,647 | 81,281 |
| Per 100 square miles | 5.2 | 6.6 | 2.3 |
| Per 10,000 residents | 0.3 | 2.9 | 2.4 |
| Deaths recorded | 1 | 236 | 6,410 |
| Busiest month | April | April | May |
By year
Seasonality
0Feb
1Mar
1Apr
7May
1Jun
3Jul
3Aug
3Sep
2Oct
1Nov
1Dec
0
Magnitude distribution
Enhanced Fujita scale wind estimates
- EF0/F0
- 65–85 mph (EF0)
- EF1/F1
- 86–110 mph (EF1)
- EF2/F2
- 111–135 mph (EF2)
- EF3/F3
- 136–165 mph (EF3)
- EF4/F4
- 166–200 mph (EF4)
- EF5/F5
- over 200 mph (EF5)
- Unrated
- no rating recorded
Tornado rating as recorded (Fujita scale before February 2007, Enhanced Fujita after).
Recorded events
All 23 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 17 Jun 2026 | Tornado | EF0 | — | — | — | — | County |
| 27 Feb 2024 | Tornado | EF1 | — | — | — | 1 | County |
| 12 Jul 2023 | Tornado | EF0 | — | — | — | — | County |
| 12 Jul 2023 | Tornado | EF0 | — | — | — | — | County |
| 10 Aug 2020 | Tornado | EF1 | — | — | — | — | County |
| 3 Sep 2019 | Tornado | EF1 | — | — | — | 1 | County |
| 2 Aug 2015 | Tornado | EF1 | $1.0M | — | — | — | County |
| 18 Apr 2002 | Tornado | F0 | — | — | — | — | County |
| 18 May 1997 | Tornado | F2 | — | — | — | — | County |
| 19 Apr 1996 | Tornado | F2 | $6.6M | — | — | 2 | County |
| 29 Jun 1990 | Tornado | F1 | $25K | — | — | — | County |
| 6 Jul 1986 | Tornado | F0 | — | — | — | — | County |
| 9 Aug 1979 | Tornado | F1 | $25K | — | — | — | County |
| 20 Apr 1976 | Tornado | F2 | $25K | — | — | 2 | County |
| 10 Nov 1975 | Tornado | F1 | $25K | — | — | — | County |
| 20 Jun 1974 | Tornado | F0 | — | — | — | — | County |
| 28 Sep 1972 | Tornado | F4 | $2.5M | — | — | 20 | County |
| 21 Apr 1967 | Tornado | F4 | $2.5M | — | 1 | 97 | County |
| 11 Apr 1965 | Tornado | F4 | — | — | — | — | County |
| 11 Apr 1965 | Tornado | F2 | $250K | — | — | — | County |
| 11 Apr 1965 | Tornado | F1 | $250K | — | — | — | County |
| 9 Oct 1958 | Tornado | F2 | $2.5M | — | — | — | County |
| 14 Mar 1957 | Tornado | F1 | $3K | — | — | — | County |
Questions and answers
How many tornado events has Lake County had?
23 events in the NCEI Storm Events record between 1950 and 2026. Reporting of tornadoes became far more complete after 1996, so early decades undercount.
When was the last recorded tornado event in Lake County?
17 Jun 2026 (Tornado, EF0). Records reach NCEI about 120 days after the month ends.
What was the most damaging tornado event recorded in Lake County?
The tornado of 19 Apr 1996, with property damage estimated by NCEI at $6.6M.
How does Lake County compare with Illinois for tornado?
5.2 events per 100 square miles against 6.6 statewide; the county holds 23 of the state's 3,647 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Tornado hub and the county page.