Illinois, 2011
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 2011 was 2,859 against 2,484 in 2010.
Counties with the most recorded events
Notable events
| Date | County | Event type | Magnitude | Property damage | Deaths | Injuries |
|---|---|---|---|---|---|---|
| 17 Jul 2011 | Cook | Heat | — | — | 16 | — |
| 1 Feb 2011 | Cook | Blizzard | — | $200,000 | 5 | — |
| 1 Feb 2011 | Forecast zone | Blizzard | — | $75,000 | 4 | — |
| 1 Aug 2011 | Cook | Heat | — | — | 4 | — |
| 27 Jul 2011 | Jo Daviess | Flash Flood | — | $7,000,000 | 3 | — |
| 1 Feb 2011 | Lake | Blizzard | — | — | 3 | — |
| 27 Jul 2011 | Stephenson | Flash Flood | — | $500,000 | 2 | — |
| 17 Jul 2011 | St. Clair | Excessive Heat | — | — | 2 | — |
| 17 Jul 2011 | Madison | Excessive Heat | — | — | 2 | — |
| 30 May 2011 | Cook | Heat | — | — | 1 | 8 |
| 11 Jan 2011 | Coles | Winter Weather | — | — | 1 | 1 |
| 1 Feb 2011 | Sangamon | Blizzard | — | $350,000 | 1 | — |
| 1 Feb 2011 | Fulton | Blizzard | — | $200,000 | 1 | — |
| 1 Feb 2011 | Champaign | Winter Storm | — | $50,000 | 1 | — |
| 11 Jul 2011 | Cook | Thunderstorm Wind | 63 mph | $4,000 | 1 | — |
| 20 Jul 2011 | Morgan | Excessive Heat | — | — | 1 | — |
| 23 Jul 2011 | Crawford | Excessive Heat | — | — | 1 | — |
| 1 Jan 2011 | Forecast zone | Cold/Wind Chill | — | — | 1 | — |
| 16 Jan 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 14 Mar 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 20 Feb 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 2 Feb 2011 | Effingham | Cold/Wind Chill | — | — | 1 | — |
| 1 Feb 2011 | Forecast zone | Blizzard | — | — | 1 | — |
| 1 Feb 2011 | Iroquois | Blizzard | — | — | 1 | — |
| 3 Feb 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 10 Jul 2011 | Madison | Excessive Heat | — | — | 1 | — |
| 10 Jul 2011 | St. Clair | Excessive Heat | — | — | 1 | — |
| 17 Jul 2011 | Adams | Excessive Heat | — | — | 1 | — |
| 1 Aug 2011 | Madison | Excessive Heat | — | — | 1 | — |
| 21 Jan 2011 | Iroquois | Cold/Wind Chill | — | — | 1 | — |
| 21 Jan 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 9 Feb 2011 | White | Winter Weather | — | — | 1 | — |
| 13 Apr 2011 | Cook | Cold/Wind Chill | — | — | 1 | — |
| 6 Jun 2011 | McLean | Heat | — | — | 1 | — |
| 6 Jun 2011 | Richland | Heat | — | — | 1 | — |
| 18 Jun 2011 | Sangamon | Flood | — | — | 1 | — |
| 17 Jun 2011 | Morgan | Flash Flood | — | $150,000,000 | — | — |
| 30 May 2011 | Will | Heat | — | — | — | 6 |
| 11 Jul 2011 | Cook | Thunderstorm Wind | 75 mph | — | — | 6 |
| 13 Jun 2011 | Clay | Thunderstorm Wind | 60 mph | $10,000 | — | 3 |
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 2011
| Declared | Number | Type | Incident | Title | Counties |
|---|---|---|---|---|---|
| 7 Jun 2011 | DR-1991 | Major disaster | Severe Storm | Severe Storms And Flooding | 21 |
| 17 Mar 2011 | DR-1960 | Major disaster | Snowstorm | Severe Winter Storm And Snowstorm | 65 |
Flood insurance claims with a 2011 date of loss
1,210 NFIP claims, 923 of them paid, for $17,697,178.
Sources: NOAA NCEI Storm Events through 30 Jun 2026; OpenFEMA DisasterDeclarationsSummaries v2 (29 Sep 2026); OpenFEMA NfipClaims v3 (8 Sep 2026). Built 30 Sep 2026.