Alert archive / Illinois / Winnebago County
Weather alerts in Winnebago County, Illinois, 2026
143 weather alerts in 2026, 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 2026. Tap one for its archive.
- Alerts
- 143
- Warnings
- 44
- Watches
- 34
- Advisories
- 31
- Busiest month
- April53 alerts
- Busiest day
- April 15, 202613 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 6 tornado warnings covering Winnebago County in 2026 had a tornado report inside them; 5 of 6 tornado reports fell inside a warning, on average 38 minutes after it went out.
Winnebago County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 2 | 67% | 6 | 83% | 38 min |
| Severe thunderstorm warnings | 14 | 9 | 36% | 32 | 44% | 24 min |
| Flash flood warnings | 4 | 1 | 75% | 1 | 100% | 33 min |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 75 | 29 | 61% | 91 | 69% | 19 min |
| NWS Chicago, IL: severe thunderstorm warnings | 265 | 167 | 37% | 1,194 | 90% | 30 min |
| NWS Chicago, IL: flash flood warnings | 59 | 31 | 47% | 188 | 86% | 119 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 7, 7:15 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Jan 18, 2:13 AM CST | Cold Weather Advisory | LOT | 34 hr |
| Jan 20, 4:00 AM CST | Winter Weather Advisory | LOT | 23 hr |
| Jan 21, 3:01 AM CST | Extreme Cold Watch | LOT | 24 hr |
| Jan 22, 3:12 AM CST | Cold Weather Advisory | LOT | 55 hr |
| Jan 22, 3:12 AM CST | Extreme Cold Warning | LOT | 33 hr |
| Jan 25, 2:35 AM CST | Cold Weather Advisory | LOT | 32 hr |
| Feb 17, 1:45 PM CST | Fire Weather Watch | LOT | 11 hr |
| Feb 18, 1:00 AM CST | Red Flag Warning | LOT | 17 hr |
| Feb 18, 1:02 AM CST | Wind Advisory | LOT | 17 hr |
| Feb 19, 1:56 PM CST | Wind Advisory | LOT | 26 hr |
| Mar 4, 1:39 AM CST | Dense Fog Advisory | LOT | 7 hr |
| Mar 4, 8:34 PM CST | Dense Fog Advisory | LOT | 37 hr |
| Mar 10, 2:41 AM CDT | Dense Fog Advisory | LOT | 8 hr |
| Mar 10, 4:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Mar 10, 5:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 10, 7:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 10, 7:40 PM CDT | Severe Thunderstorm Warning | LOT | 65 min |
| Mar 12, 1:33 AM CDT | Wind Advisory | LOT | 40 hr |
| Mar 12, 11:28 AM CDT | High Wind Warning | LOT | 29 hr |
| Mar 14, 2:03 AM CDT | Winter Storm Watch | LOT | 31 hr |
| Mar 15, 9:27 AM CDT | Winter Storm Warning | LOT | 9 hr |
| Mar 15, 9:27 AM CDT | Winter Weather Advisory | LOT | 39 hr |
| Mar 15, 6:51 PM CDT | Blizzard Warning | LOT | 16 hr |
| Mar 30, 8:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 9:21 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 30, 11:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 31, 1:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Apr 2, 10:25 AM CDT | River Flood Watch | LOT | 29 hr |
| Apr 2, 12:28 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 2, 1:43 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 2, 6:24 PM CDT | Severe Thunderstorm Warning | LOT | 36 min |
| Apr 3, 3:01 PM CDT | River Flood Warning | LOT | 3 days |
| Apr 3, 3:56 PM CDT | Flood Watch | LOT | 18 hr |
| Apr 4, 2:30 PM CDT | River Flood Warning | LOT | 23 hr |
| Apr 14, 12:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 2:33 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 14, 6:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 14, 7:11 PM CDT | Flood Watch | LOT | 30 hr |
| Apr 14, 7:59 PM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| Apr 14, 8:20 PM CDT | Tornado Warning | LOT | 25 min |
| Apr 14, 8:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 14, 8:37 PM CDT | Flash Flood Warning | LOT | 3 hr |
| Apr 14, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | 48 min |
| Apr 15, 4:23 AM CDT | River Flood Watch | MKX | 21 days |
| Apr 15, 11:42 AM CDT | River Flood Watch | LOT | 20 hr |
| Apr 15, 11:42 AM CDT | River Flood Watch | LOT | 23 hr |
| Apr 15, 11:42 AM CDT | River Flood Watch | LOT | 24 hr |
| Apr 15, 11:52 AM CDT | River Flood Watch | LOT | 24 hr |
| Apr 15, 11:52 AM CDT | River Flood Watch | LOT | 20 hr |
| Apr 15, 4:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 15, 7:55 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 15, 7:56 PM CDT | Tornado Warning | LOT | 34 min |
| Apr 15, 8:19 PM CDT | Severe Thunderstorm Warning | LOT | 24 min |
| Apr 15, 8:27 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Apr 15, 10:46 PM CDT | River Flood Warning | MKX | 44 hr |
| Apr 15, 11:23 PM CDT | River Flood Warning | MKX | 5 days |
| Apr 16, 7:30 AM CDT | River Flood Warning | LOT | 3 days |
| Apr 16, 7:58 AM CDT | River Flood Warning | LOT | 14 days |
| Apr 16, 11:01 AM CDT | River Flood Warning | LOT | 13 days |
| Apr 16, 11:24 AM CDT | River Flood Warning | LOT | 4 days |
| Apr 16, 11:29 AM CDT | River Flood Warning | LOT | 10 days |
| Apr 16, 12:25 PM CDT | River Flood Warning | MKX | 21 days |
| Apr 17, 11:48 AM CDT | Flood Watch | LOT | 15 hr |
| Apr 17, 11:48 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 12:40 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 17, 4:09 PM CDT | Tornado Warning | LOT | 66 min |
| Apr 17, 4:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 4:52 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Apr 17, 5:07 PM CDT | Tornado Warning | LOT | 30 min |
| Apr 17, 6:25 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 6:39 PM CDT | Severe Thunderstorm Warning | LOT | 81 min |
| Apr 17, 7:09 PM CDT | Tornado Warning | LOT | 36 min |
| Apr 17, 7:26 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Apr 17, 10:12 PM CDT | River Flood Warning | MKX | 24 hr |
| Apr 17, 10:57 PM CDT | River Flood Watch | LOT | 36 hr |
| Apr 18, 1:29 PM CDT | Frost Advisory | LOT | 20 hr |
| Apr 18, 1:29 PM CDT | Freeze Watch | LOT | 12 hr |
| Apr 19, 1:52 AM CDT | Freeze Warning | LOT | 30 hr |
| Apr 21, 1:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Apr 27, 11:18 AM CDT | Wind Advisory | LOT | 5 hr |
| May 1, 3:32 AM CDT | Frost Advisory | LOT | 28 hr |
| May 4, 3:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 1:23 PM CDT | Frost Advisory | LOT | 19 hr |
| May 15, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 15, 10:33 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 16, 12:29 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 8, 12:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 12:00 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 10, 1:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 1:38 PM CDT | Severe Thunderstorm Warning | LOT | 67 min |
| Jun 11, 10:05 AM CDT | Flood Watch | LOT | 11 hr |
| Jun 11, 1:57 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 11, 5:30 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jun 11, 5:39 PM CDT | Severe Thunderstorm Warning | LOT | 51 min |
| Jun 11, 9:06 PM CDT | Areal Flood Advisory | LOT | 22 hr |
| Jun 12, 10:57 AM CDT | River Flood Warning | LOT | 33 hr |
| Jun 17, 2:20 AM CDT | Flood Watch | LOT | 15 hr |
| Jun 17, 9:17 AM CDT | Wind Advisory | LOT | 5 hr |
| Jun 24, 12:44 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 24, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 4:22 PM CDT | Severe Thunderstorm Warning | LOT | 38 min |
| Jun 24, 5:02 PM CDT | Severe Thunderstorm Warning | LOT | 43 min |
| Jun 24, 5:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 28, 2:47 AM CDT | Heat Advisory | LOT | 47 hr |
| Jun 28, 11:18 AM CDT | Extreme Heat Warning | LOT | 5 days |
| Jul 1, 2:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 2, 2:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 2, 7:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 11:14 AM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| Jul 3, 11:15 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 5:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 3, 6:35 PM CDT | Tornado Warning | LOT | 25 min |
| Jul 3, 6:37 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 3, 6:51 PM CDT | Severe Thunderstorm Warning | LOT | 54 min |
| Jul 4, 12:43 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jul 25, 1:04 PM CDT | Heat Advisory | LOT | 31 hr |
| Jul 27, 2:10 AM CDT | Extreme Heat Warning | LOT | 19 hr |
| Jul 27, 3:02 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Aug 9, 5:03 PM CDT | Flood Watch | LOT | 10 hr |
| Aug 9, 8:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 12:47 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 11, 7:22 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 11, 8:45 AM CDT | Severe Thunderstorm Warning | LOT | 90 min |
| Aug 11, 9:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 9:32 AM CDT | Areal Flood Advisory | LOT | 4 hr |
| Aug 11, 8:04 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 2:42 AM CDT | Dense Fog Advisory | LOT | 6 hr |
| Aug 18, 5:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 2:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 21, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 21, 3:45 PM CDT | Severe Thunderstorm Warning | LOT | 22 min |
| Aug 21, 6:13 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 12:24 PM CDT | Heat Advisory | LOT | 33 hr |
| Aug 31, 12:24 PM CDT | Heat Advisory | LOT | 3 days |
| Sep 3, 7:56 PM CDT | Heat Advisory | LOT | 25 hr |
| Sep 10, 3:11 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Sep 18, 1:47 PM CDT | Flood Watch | LOT | 47 hr |
| Sep 19, 3:29 AM CDT | Areal Flood Advisory | LOT | 8 hr |
| Sep 19, 12:27 PM CDT | River Flood Watch | MKX | 22 hr |
| Sep 20, 4:30 AM CDT | Areal Flood Advisory | LOT | 4 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 archive2025
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.