Illinois, 1991
The year's recorded storm events, federal disaster declarations and flood insurance claims.
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.
Events by hazard
Includes events recorded by forecast zone. The state's yearly total for 1991 was 308 against 275 in 1990.
Counties with the most recorded events
Notable events
| Date | County | Event type | Magnitude | Property damage | Deaths | Injuries |
|---|---|---|---|---|---|---|
| 5 May 1991 | Cook | Thunderstorm Wind | 0 mph | — | 2 | 2 |
| 31 May 1991 | Cook | Thunderstorm Wind | 0 mph | — | 1 | — |
| 19 Nov 1991 | Williamson | Tornado | F3 | $25,000,000 | — | 16 |
| 27 Mar 1991 | Cook | Tornado | F3 | $25,000,000 | — | 7 |
| 29 Nov 1991 | Mercer | Thunderstorm Wind | 0 mph | — | — | 3 |
| 27 Mar 1991 | Will | Tornado | F3 | $25,000,000 | — | — |
| 27 Mar 1991 | Will | Tornado | F3 | $25,000,000 | — | — |
| 18 Aug 1991 | Adams | Thunderstorm Wind | 75 mph | — | — | 2 |
| 22 Mar 1991 | Iroquois | Tornado | F1 | $2,500,000 | — | — |
| 22 Mar 1991 | Kankakee | Tornado | F1 | $2,500,000 | — | — |
| 22 Mar 1991 | Vermilion | Tornado | F1 | $2,500,000 | — | — |
| 3 Aug 1991 | Richland | Tornado | F1 | $2,500,000 | — | — |
| 8 Dec 1991 | McLean | Tornado | F0 | $250,000 | — | — |
| 4 Oct 1991 | Tazewell | Tornado | F1 | $250,000 | — | — |
| 29 Apr 1991 | LaSalle | Tornado | F1 | $25,000 | — | — |
| 29 Apr 1991 | Boone | Tornado | F0 | $25,000 | — | — |
| 29 Apr 1991 | Lee | Tornado | F1 | $25,000 | — | — |
| 5 May 1991 | Kane | Tornado | F1 | $25,000 | — | — |
| 27 Mar 1991 | Will | Tornado | F0 | $2,500 | — | — |
| 23 Apr 1991 | DuPage | Tornado | F1 | $2,500 | — | — |
| 31 May 1991 | Rock Island | Tornado | F1 | $2,500 | — | — |
| 16 May 1991 | Piatt | Tornado | F0 | — | — | — |
| 29 Apr 1991 | Woodford | Tornado | F0 | — | — | — |
| 29 Apr 1991 | Winnebago | Tornado | F0 | — | — | — |
| 29 Apr 1991 | McLean | Tornado | F1 | — | — | — |
| 29 Apr 1991 | De Witt | Tornado | F0 | — | — | — |
| 29 Apr 1991 | McHenry | Tornado | F0 | — | — | — |
| 17 May 1991 | McDonough | Tornado | F0 | — | — | — |
| 31 May 1991 | Tazewell | Tornado | F0 | — | — | — |
| 27 Mar 1991 | Kankakee | Tornado | F1 | — | — | — |
| 18 May 1991 | Adams | Tornado | F0 | — | — | — |
| 22 May 1991 | Will | Tornado | F0 | — | — | — |
| 25 May 1991 | LaSalle | Tornado | F0 | — | — | — |
| 5 May 1991 | Cook | Tornado | F0 | — | — | — |
| 10 May 1991 | St. Clair | Tornado | F0 | — | — | — |
| 14 May 1991 | Tazewell | Tornado | F0 | — | — | — |
| 14 May 1991 | Tazewell | Tornado | F0 | — | — | — |
| 11 May 1991 | St. Clair | Tornado | F0 | — | — | — |
| 27 Mar 1991 | Will | Tornado | F0 | — | — | — |
| 4 Oct 1991 | McLean | Tornado | F1 | — | — | — |
Up to 40 events with deaths, injuries, damage of $50,000 or more, or a tornado rating, ranked by deaths, injuries and damage.
Federal disaster declarations in 1991
No declaration touching Illinois was made in 1991.
Flood insurance claims with a 1991 date of loss
158 NFIP claims, 89 of them paid, for $520,910.
Sources: NOAA NCEI Storm Events through 30 Jun 2026; OpenFEMA DisasterDeclarationsSummaries v2 (1 Oct 2026); OpenFEMA NfipClaims v3 (8 Sep 2026). Built 1 Oct 2026.