Alert archive / Illinois / Winnebago County
Weather alerts in Winnebago County, Illinois, 2020
125 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 125
- Warnings
- 24
- Watches
- 19
- Advisories
- 49
- Busiest month
- March24 alerts
- Busiest day
- May 23, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 4 tornado warnings covering Winnebago County in 2020 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 4 minutes after it went out.
Winnebago County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 2 | 50% | 4 min |
| Severe thunderstorm warnings | 7 | 6 | 14% | 41 | 95% | 39 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 25 | 5 | 80% | 35 | 37% | 13 min |
| NWS Chicago, IL: severe thunderstorm warnings | 112 | 77 | 31% | 443 | 83% | 33 min |
| NWS Chicago, IL: flash flood warnings | 19 | 11 | 42% | 64 | 83% | 114 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 9, 1:36 PM CST | Winter Storm Watch | LOT | 22 hr |
| Jan 10, 4:03 AM CST | Winter Storm Warning | LOT | 44 hr |
| Jan 12, 7:37 PM CST | Winter Weather Advisory | LOT | 7 hr |
| Jan 14, 2:33 PM CST | Winter Weather Advisory | LOT | 21 hr |
| Jan 16, 2:44 PM CST | Winter Weather Advisory | LOT | 51 hr |
| Jan 18, 2:24 PM CST | Wind Chill Advisory | LOT | 20 hr |
| Jan 24, 3:12 AM CST | Winter Weather Advisory | LOT | 35 hr |
| Feb 8, 1:38 PM CST | Winter Weather Advisory | LOT | 26 hr |
| Feb 11, 2:38 PM CST | Winter Weather Advisory | LOT | 52 hr |
| Feb 13, 1:29 AM CST | Special Weather Statement | LOT | 61 min |
| Feb 13, 2:07 PM CST | Wind Chill Advisory | LOT | 20 hr |
| Feb 17, 8:24 PM CST | Dense Fog Advisory | LOT | 6 hr |
| Feb 23, 2:11 PM CST | Winter Storm Watch | LOT | 48 hr |
| Mar 5, 2:10 PM CST | Wind Advisory | LOT | 22 hr |
| Mar 9, 10:51 AM CDT | River Flood Watch | MKX | 35 hr |
| Mar 10, 10:17 AM CDT | River Flood Advisory | LOT | 21 days |
| Mar 10, 10:30 AM CDT | River Flood Advisory | LOT | 7 days |
| Mar 19, 6:41 AM CDT | Dense Fog Advisory | LOT | 3 hr |
| Mar 19, 10:34 AM CDT | River Flood Watch | LOT | 10 hr |
| Mar 19, 10:39 AM CDT | River Flood Advisory | LOT | 20 hr |
| Mar 19, 10:39 AM CDT | River Flood Advisory | LOT | 21 days |
| Mar 19, 10:51 AM CDT | River Flood Watch | MKX | 3 days |
| Mar 19, 10:51 AM CDT | River Flood Watch | MKX | 21 days |
| Mar 19, 8:37 PM CDT | River Flood Advisory | LOT | 21 days |
| Mar 20, 10:38 AM CDT | River Flood Advisory | LOT | 46 hr |
| Mar 20, 10:47 AM CDT | River Flood Watch | MKX | 21 days |
| Mar 20, 12:06 PM CDT | River Flood Warning | MKX | 21 days |
| Mar 23, 5:21 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Mar 28, 2:29 AM CDT | River Flood Warning | LOT | 4 days |
| Mar 28, 2:29 AM CDT | River Flood Warning | LOT | 7 days |
| Mar 28, 2:29 AM CDT | River Flood Warning | LOT | 21 days |
| Mar 28, 2:39 AM CDT | River Flood Advisory | LOT | 21 days |
| Mar 28, 2:43 PM CDT | Wind Advisory | LOT | 29 hr |
| Mar 28, 7:01 PM CDT | Severe Thunderstorm Warning | LOT | 29 min |
| Mar 28, 8:41 PM CDT | Tornado Watch | SPC | 3 hr |
| Mar 28, 9:19 PM CDT | Tornado Warning | LOT | 26 min |
| Mar 29, 10:17 AM CDT | River Flood Advisory | LOT | 6 days |
| Apr 7, 3:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 7, 5:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 7, 5:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 7, 6:14 PM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| Apr 7, 7:01 PM CDT | Severe Thunderstorm Warning | LOT | 59 min |
| Apr 7, 7:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 8, 4:16 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Apr 9, 3:18 AM CDT | Wind Advisory | LOT | 16 hr |
| Apr 12, 3:57 AM CDT | Wind Advisory | LOT | 36 hr |
| Apr 15, 5:22 AM CDT | Winter Weather Advisory | LOT | 5 hr |
| Apr 20, 6:00 PM CDT | Special Weather Statement | LOT | 60 min |
| Apr 29, 11:54 AM CDT | River Flood Watch | LOT | 10 hr |
| Apr 29, 10:21 PM CDT | River Flood Warning | LOT | 11 hr |
| May 7, 3:33 AM CDT | Freeze Watch | LOT | 24 hr |
| May 8, 3:56 AM CDT | Freeze Warning | LOT | 27 hr |
| May 10, 2:35 PM CDT | Frost Advisory | LOT | 8 hr |
| May 11, 2:45 PM CDT | Frost Advisory | LOT | 17 hr |
| May 14, 10:47 PM CDT | Areal Flood Advisory | LOT | 4 hr |
| May 15, 2:06 AM CDT | River Flood Advisory | LOT | 36 hr |
| May 15, 10:14 AM CDT | River Flood Warning | LOT | 6 days |
| May 17, 1:12 PM CDT | River Flood Advisory | LOT | 25 hr |
| May 17, 1:12 PM CDT | River Flood Advisory | LOT | 33 hr |
| May 20, 7:08 PM CDT | River Flood Advisory | LOT | 3 days |
| May 23, 12:33 PM CDT | Tornado Watch | SPC | 8 hr |
| May 23, 2:26 PM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| May 23, 2:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 23, 3:09 PM CDT | Severe Thunderstorm Warning | LOT | 66 min |
| May 23, 3:14 PM CDT | Tornado Warning | LOT | 61 min |
| May 23, 4:18 PM CDT | Special Weather Statement | LOT | 27 min |
| May 23, 4:30 PM CDT | Special Weather Statement | LOT | 15 min |
| May 23, 9:20 PM CDT | River Flood Advisory | LOT | 3 days |
| May 24, 9:01 AM CDT | River Flood Advisory | LOT | 21 hr |
| May 24, 9:17 AM CDT | River Flood Advisory | LOT | 16 hr |
| May 26, 6:55 PM CDT | Special Weather Statement | LOT | 20 min |
| Jun 5, 12:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 9, 2:33 AM CDT | Wind Advisory | LOT | 21 hr |
| Jun 10, 2:40 AM CDT | Special Weather Statement | LOT | 50 min |
| Jun 26, 5:43 AM CDT | Special Weather Statement | LOT | 47 min |
| Jun 26, 12:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 3:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 6:25 PM CDT | Tornado Warning | LOT | 20 min |
| Jun 29, 3:33 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Jun 29, 4:23 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jul 7, 6:59 PM CDT | Special Weather Statement | LOT | 31 min |
| Jul 9, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 9, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 9, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 11, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 15, 3:18 AM CDT | Special Weather Statement | LOT | 42 min |
| Jul 17, 3:36 AM CDT | Heat Advisory | LOT | 40 hr |
| Jul 18, 11:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 11:28 AM CDT | Special Weather Statement | LOT | 62 min |
| Jul 26, 5:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 26, 6:40 PM CDT | Special Weather Statement | LOT | 65 min |
| Aug 9, 1:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 5:17 PM CDT | Special Weather Statement | LOT | 43 min |
| Aug 10, 10:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 10, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 1:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 10, 1:41 PM CDT | Severe Thunderstorm Warning | LOT | 94 min |
| Aug 10, 2:43 PM CDT | Tornado Warning | LOT | 62 min |
| Aug 10, 3:21 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 10, 4:23 PM CDT | High Wind Warning | LOT | 90 min |
| Aug 25, 3:32 PM CDT | Flash Flood Warning | LOT | 3 min |
| Aug 28, 5:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Sep 6, 9:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Oct 1, 3:25 AM CDT | Frost Advisory | LOT | 30 hr |
| Oct 4, 3:46 AM CDT | Frost Advisory | LOT | 28 hr |
| Oct 14, 3:33 AM CDT | Wind Advisory | LOT | 15 hr |
| Oct 14, 7:41 PM CDT | Freeze Watch | LOT | 7 hr |
| Oct 15, 2:35 AM CDT | Freeze Warning | LOT | 30 hr |
| Oct 16, 2:40 PM CDT | Wind Advisory | LOT | 28 hr |
| Oct 22, 4:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 31, 10:44 AM CDT | Wind Advisory | LOT | 30 hr |
| Nov 10, 2:58 AM CST | Wind Advisory | LOT | 24 hr |
| Nov 10, 1:28 PM CST | Mesoscale Discussion | SPC | 92 min |
| Nov 10, 2:05 PM CST | Tornado Watch | SPC | 6 hr |
| Nov 10, 3:20 PM CST | Severe Thunderstorm Warning | LOT | 70 min |
| Nov 10, 3:30 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Nov 14, 3:04 AM CST | Wind Advisory | LOT | 41 hr |
| Nov 23, 2:24 PM CST | Winter Weather Advisory | LOT | 19 hr |
| Dec 11, 8:39 PM CST | Winter Weather Advisory | LOT | 17 hr |
| Dec 23, 2:32 AM CST | Wind Advisory | LOT | 25 hr |
| Dec 28, 3:31 AM CST | Winter Storm Watch | LOT | 12 hr |
| Dec 28, 3:04 PM CST | Winter Storm Warning | LOT | 42 hr |
| Dec 29, 2:17 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 30, 1:15 AM CST | Mesoscale Discussion | SPC | 6 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 archive20192021
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.