Alert archive / Illinois / Winnebago County
Weather alerts in Winnebago County, Illinois, 2025
109 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Winnebago County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 109
- Warnings
- 22
- Watches
- 20
- Advisories
- 43
- Busiest month
- July26 alerts
- Busiest day
- July 10, 20259 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Winnebago County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 12 | 9 | 25% | 23 | 78% | 18 min |
| Flash flood warnings | 3 | 2 | 33% | 8 | 25% | 81 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 19 | 6 | 68% | 23 | 48% | 11 min |
| NWS Chicago, IL: severe thunderstorm warnings | 137 | 95 | 31% | 628 | 86% | 25 min |
| NWS Chicago, IL: flash flood warnings | 34 | 19 | 44% | 130 | 78% | 56 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 18, 2:15 AM CST | Cold Weather Advisory | LOT | 57 hr |
| Jan 19, 12:58 PM CST | Cold Weather Advisory | LOT | 59 hr |
| Jan 21, 2:03 AM CST | Extreme Cold Warning | LOT | 10 hr |
| Jan 26, 12:37 PM CST | Wind Advisory | LOT | 29 hr |
| Jan 27, 3:26 AM CST | Fire Weather Watch | LOT | 7 hr |
| Jan 28, 12:54 AM CST | Wind Advisory | LOT | 17 hr |
| Jan 30, 8:28 PM CST | Dense Fog Advisory | LOT | 13 hr |
| Feb 4, 2:21 PM CST | Winter Weather Advisory | LOT | 40 hr |
| Feb 8, 2:00 AM CST | Winter Weather Advisory | LOT | 16 hr |
| Feb 10, 1:15 PM CST | Winter Storm Watch | LOT | 22 hr |
| Feb 11, 11:41 AM CST | Winter Weather Advisory | LOT | 39 hr |
| Feb 16, 2:21 AM CST | Cold Weather Advisory | LOT | 33 hr |
| Feb 17, 2:27 AM CST | Cold Weather Advisory | LOT | 34 hr |
| Feb 18, 3:04 AM CST | Cold Weather Advisory | LOT | 31 hr |
| Feb 27, 12:35 AM CST | Dense Fog Advisory | LOT | 6 hr |
| Feb 27, 1:55 PM CST | Wind Advisory | LOT | 31 hr |
| Mar 4, 3:06 PM CST | Wind Advisory | LOT | 33 hr |
| Mar 13, 3:40 AM CDT | High Wind Watch | LOT | 35 hr |
| Mar 13, 3:40 AM CDT | Wind Advisory | LOT | 51 hr |
| Mar 13, 10:36 AM CDT | Fire Weather Watch | LOT | 24 hr |
| Mar 14, 4:11 AM CDT | Red Flag Warning | LOT | 20 hr |
| Mar 14, 2:26 PM CDT | High Wind Warning | LOT | 18 hr |
| Mar 14, 2:26 PM CDT | Wind Advisory | LOT | 26 hr |
| Mar 14, 6:55 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Mar 14, 9:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 14, 10:59 PM CDT | Severe Thunderstorm Warning | LOT | 76 min |
| Mar 14, 11:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 19, 2:57 AM CDT | Wind Advisory | LOT | 28 hr |
| Mar 19, 9:33 AM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 23, 3:15 AM CDT | Wind Advisory | LOT | 21 hr |
| May 8, 12:50 PM CDT | Frost Advisory | LOT | 18 hr |
| May 15, 10:12 AM CDT | Fire Weather Watch | LOT | 23 hr |
| May 15, 2:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 3:05 PM CDT | Tornado Watch | SPC | 6 hr |
| May 15, 4:38 PM CDT | Severe Thunderstorm Warning | LOT | 52 min |
| May 15, 5:57 PM CDT | Severe Thunderstorm Warning | LOT | 71 min |
| May 16, 10:56 AM CDT | Wind Advisory | LOT | 10 hr |
| May 16, 3:52 PM CDT | Blowing Dust Advisory | LOT | 5 hr |
| May 16, 6:43 PM CDT | Severe Thunderstorm Warning | LOT | 35 min |
| Jun 3, 12:41 PM CDT | Special Weather Statement | LOT | 34 min |
| Jun 3, 12:50 PM CDT | Severe Thunderstorm Warning | LOT | 40 min |
| Jun 3, 4:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 7:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 3, 8:44 PM CDT | Special Weather Statement | LOT | 46 min |
| Jun 18, 4:55 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jun 18, 5:31 PM CDT | River Flood Warning | MKX | 21 hr |
| Jun 20, 3:50 AM CDT | Heat Advisory | LOT | 5 days |
| Jun 25, 6:55 PM CDT | Special Weather Statement | LOT | 20 min |
| Jun 29, 7:51 PM CDT | Special Weather Statement | LOT | 69 min |
| Jun 29, 8:59 PM CDT | Special Weather Statement | LOT | 61 min |
| Jul 9, 3:46 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Jul 10, 3:39 PM CDT | Special Weather Statement | LOT | 36 min |
| Jul 10, 4:23 PM CDT | Special Weather Statement | LOT | 52 min |
| Jul 10, 4:25 PM CDT | Severe Thunderstorm Warning | LOT | 35 min |
| Jul 10, 4:49 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| Jul 10, 4:51 PM CDT | Areal Flood Advisory | LOT | 2 hr |
| Jul 10, 5:05 PM CDT | Flash Flood Warning | LOT | 6 hr |
| Jul 10, 5:21 PM CDT | Severe Thunderstorm Warning | LOT | 39 min |
| Jul 10, 5:33 PM CDT | Flood Watch | LOT | 7 hr |
| Jul 10, 6:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 7:58 PM CDT | Flash Flood Warning | LOT | 3 hr |
| Jul 10, 10:52 PM CDT | Areal Flood Warning | LOT | 6 hr |
| Jul 11, 3:37 AM CDT | Flood Watch | LOT | 18 hr |
| Jul 11, 3:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 11, 4:51 PM CDT | Tornado Watch | SPC | 5 hr |
| Jul 11, 5:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 11, 5:59 PM CDT | Severe Thunderstorm Warning | LOT | 76 min |
| Jul 16, 11:45 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 12:37 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 21, 3:48 AM CDT | Extreme Heat Watch | LOT | 34 hr |
| Jul 22, 3:21 AM CDT | Heat Advisory | LOT | 64 hr |
| Jul 25, 11:49 AM CDT | Flood Watch | LOT | 27 hr |
| Jul 25, 9:54 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 27, 1:27 PM CDT | Heat Advisory | LOT | 31 hr |
| Jul 30, 3:18 AM CDT | Flood Watch | LOT | 25 hr |
| Jul 30, 4:49 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Aug 9, 2:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 9, 7:47 PM CDT | Flood Watch | LOT | 14 hr |
| Aug 10, 10:45 AM CDT | Areal Flood Advisory | LOT | 2 hr |
| Aug 12, 3:54 AM CDT | Special Weather Statement | LOT | 51 min |
| Aug 16, 11:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 1:56 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 16, 2:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 16, 2:43 PM CDT | Severe Thunderstorm Warning | LOT | 47 min |
| Aug 16, 3:04 PM CDT | Severe Thunderstorm Warning | LOT | 40 min |
| Aug 16, 3:36 PM CDT | Severe Thunderstorm Warning | LOT | 39 min |
| Aug 16, 8:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 18, 11:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 18, 12:13 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 18, 1:14 PM CDT | Special Weather Statement | LOT | 46 min |
| Aug 18, 2:21 PM CDT | Flood Watch | LOT | 13 hr |
| Aug 18, 6:52 PM CDT | Flash Flood Warning | LOT | 3 hr |
| Sep 14, 5:03 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Sep 21, 3:59 PM CDT | Areal Flood Advisory | LOT | 2 hr |
| Oct 22, 2:41 AM CDT | Frost Advisory | LOT | 30 hr |
| Oct 23, 3:07 AM CDT | Freeze Warning | LOT | 29 hr |
| Nov 25, 2:03 AM CST | Wind Advisory | LOT | 42 hr |
| Nov 25, 6:44 AM CST | Dense Fog Advisory | LOT | 3 hr |
| Nov 27, 3:07 AM CST | Winter Storm Watch | LOT | 32 hr |
| Nov 28, 2:03 AM CST | Winter Storm Warning | LOT | 48 hr |
| Nov 30, 1:51 AM CST | Winter Weather Advisory | LOT | 10 hr |
| Dec 1, 1:54 AM CST | Winter Weather Advisory | LOT | 25 hr |
| Dec 6, 2:34 AM CST | Winter Weather Advisory | LOT | 32 hr |
| Dec 12, 2:28 PM CST | Cold Weather Advisory | LOT | 46 hr |
| Dec 18, 9:36 AM CST | Dense Fog Advisory | LOT | 84 min |
| Dec 26, 5:19 AM CST | Dense Fog Advisory | LOT | 6 hr |
| Dec 27, 1:25 PM CST | Wind Advisory | LOT | 50 hr |
| Dec 28, 3:09 AM CST | Dense Fog Advisory | LOT | 6 hr |
| Dec 28, 9:07 PM CST | Winter Weather Advisory | LOT | 13 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.