Alert archive / Illinois / Winnebago County
Weather alerts in Winnebago County, Illinois, 2009
167 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 167
- Warnings
- 42
- Watches
- 36
- Advisories
- 59
- Busiest month
- June30 alerts
- Busiest day
- June 19, 200915 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, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 6 | 40% | 19 | 58% | 17 min |
| Flash flood warnings | 5 | 2 | 60% | 7 | 100% | 95 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Chicago, IL: tornado warnings | 12 | 3 | 75% | 11 | 73% | 11 min |
| NWS Chicago, IL: severe thunderstorm warnings | 97 | 47 | 52% | 183 | 68% | 26 min |
| NWS Chicago, IL: flash flood warnings | 25 | 10 | 60% | 31 | 87% | 80 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 8, 2:53 PM CST | Winter Weather Advisory | LOT | 51 hr |
| Jan 12, 4:21 AM CST | Blizzard Watch | LOT | 7 hr |
| Jan 12, 4:21 AM CST | Winter Weather Advisory | LOT | 28 hr |
| Jan 12, 11:49 AM CST | Blizzard Warning | LOT | 16 hr |
| Jan 12, 3:40 PM CST | Blizzard Watch | LOT | 19 hr |
| Jan 13, 2:07 PM CST | Wind Chill Watch | LOT | 13 hr |
| Jan 13, 3:02 PM CST | Winter Weather Advisory | LOT | 33 hr |
| Jan 13, 11:38 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 3:23 AM CST | Wind Chill Warning | LOT | 57 hr |
| Jan 15, 10:43 AM CST | River Flood Advisory | LOT | 7 days |
| Jan 16, 3:08 PM CST | Wind Chill Advisory | LOT | 9 hr |
| Jan 23, 4:14 AM CST | Wind Chill Advisory | LOT | 32 hr |
| Feb 10, 10:03 PM CST | River Flood Warning | LOT | 24 hr |
| Feb 11, 1:31 AM CST | Dense Fog Advisory | LOT | 7 hr |
| Feb 12, 8:54 PM CST | River Flood Warning | LOT | 4 days |
| Feb 18, 4:13 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Feb 19, 1:38 PM CST | Winter Storm Watch | LOT | 14 hr |
| Feb 20, 3:41 AM CST | Winter Storm Warning | LOT | 34 hr |
| Feb 20, 3:41 AM CST | Winter Weather Advisory | LOT | 41 hr |
| Feb 20, 11:57 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 27, 10:33 AM CST | River Flood Warning | LOT | 19 hr |
| Feb 27, 10:33 AM CST | River Flood Warning | LOT | 49 hr |
| Feb 27, 10:51 AM CST | River Flood Advisory | LOT | 48 hr |
| Mar 6, 5:29 AM CST | Dense Fog Advisory | LOT | 5 hr |
| Mar 6, 3:28 PM CST | Flash Flood Watch | LOT | 48 hr |
| Mar 7, 10:37 AM CST | River Flood Advisory | LOT | 11 hr |
| Mar 7, 9:26 PM CST | River Flood Advisory | LOT | 14 hr |
| Mar 7, 9:37 PM CST | River Flood Watch | LOT | 14 hr |
| Mar 8, 4:03 AM CDT | Areal Flood Warning | LOT | 30 hr |
| Mar 8, 12:00 PM CDT | River Flood Warning | LOT | 12 days |
| Mar 8, 12:00 PM CDT | River Flood Warning | LOT | 8 days |
| Mar 8, 12:00 PM CDT | River Flood Warning | LOT | 4 days |
| Mar 8, 12:00 PM CDT | River Flood Warning | LOT | 10 days |
| Mar 9, 3:39 AM CDT | Flash Flood Watch | LOT | 24 hr |
| Mar 10, 2:03 AM CDT | Areal Flood Warning | LOT | 36 hr |
| Mar 10, 3:37 AM CDT | Wind Advisory | LOT | 27 hr |
| Mar 18, 9:23 PM CDT | River Flood Warning | LOT | 5 hr |
| Mar 24, 9:32 AM CDT | River Flood Watch | LOT | 11 hr |
| Mar 24, 9:32 AM CDT | River Flood Watch | LOT | 11 hr |
| Mar 24, 9:32 AM CDT | River Flood Watch | LOT | 19 hr |
| Mar 24, 7:03 PM CDT | Areal Flood Advisory | LOT | 86 days |
| Mar 24, 8:25 PM CDT | River Flood Warning | LOT | 13 days |
| Mar 24, 8:25 PM CDT | River Flood Warning | LOT | 10 days |
| Mar 24, 8:32 PM CDT | River Flood Warning | LOT | 8 days |
| Mar 24, 9:48 PM CDT | Severe Thunderstorm Warning | LOT | 27 min |
| Mar 24, 10:05 PM CDT | Severe Thunderstorm Warning | LOT | 55 min |
| Mar 27, 12:58 PM CDT | Winter Storm Watch | LOT | 19 hr |
| Mar 28, 3:40 AM CDT | Winter Storm Warning | LOT | 24 hr |
| Mar 29, 3:11 AM CDT | Winter Weather Advisory | LOT | 8 hr |
| Apr 4, 4:47 AM CDT | Winter Weather Advisory | LOT | 42 hr |
| Apr 20, 9:43 AM CDT | River Flood Advisory | LOT | 11 days |
| Apr 25, 5:32 PM CDT | Mesoscale Discussion | SPC | 73 min |
| Apr 26, 5:46 AM CDT | Areal Flood Advisory | LOT | 54 days |
| Apr 26, 2:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Apr 26, 2:01 PM CDT | Areal Flood Advisory | LOT | 57 days |
| Apr 26, 9:06 PM CDT | River Flood Warning | LOT | 23 hr |
| Apr 26, 9:23 PM CDT | River Flood Warning | LOT | 31 min |
| Apr 27, 5:26 AM CDT | River Flood Watch | LOT | 15 hr |
| Apr 27, 5:26 AM CDT | River Flood Watch | LOT | 14 hr |
| Apr 27, 10:40 AM CDT | River Flood Warning | LOT | 10 hr |
| Apr 27, 10:46 AM CDT | River Flood Advisory | LOT | 9 hr |
| Apr 27, 8:19 PM CDT | River Flood Advisory | LOT | 16 days |
| Apr 29, 3:10 PM CDT | Flash Flood Watch | LOT | 20 hr |
| Apr 30, 7:01 AM CDT | Areal Flood Advisory | LOT | 53 days |
| May 6, 4:53 PM CDT | Areal Flood Advisory | LOT | 49 days |
| May 8, 5:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| May 8, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 8, 8:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 13, 9:33 AM CDT | River Flood Watch | LOT | 11 hr |
| May 13, 9:33 AM CDT | River Flood Watch | LOT | 11 hr |
| May 13, 5:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 13, 6:02 PM CDT | Tornado Watch | SPC | 5 hr |
| May 13, 8:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| May 13, 9:19 PM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| May 13, 9:22 PM CDT | Flash Flood Warning | LOT | 4 hr |
| May 13, 9:59 PM CDT | Severe Thunderstorm Warning | LOT | 61 min |
| May 14, 6:06 AM CDT | River Flood Advisory | LOT | 17 days |
| May 14, 3:34 PM CDT | Flash Flood Watch | LOT | 30 hr |
| May 15, 8:54 AM CDT | River Flood Watch | LOT | 13 hr |
| May 15, 12:38 PM CDT | Wind Advisory | LOT | 2 hr |
| May 16, 3:23 AM CDT | Frost Advisory | LOT | 28 hr |
| Jun 1, 5:00 PM CDT | Severe Thunderstorm Warning | LOT | 60 min |
| Jun 1, 5:37 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Jun 8, 1:44 AM CDT | Flash Flood Warning | LOT | 8 hr |
| Jun 8, 1:23 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 8:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 18, 11:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 18, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 19, 1:27 AM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| Jun 19, 2:38 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 19, 6:58 AM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 19, 7:14 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 19, 7:49 AM CDT | Severe Thunderstorm Warning | LOT | 45 min |
| Jun 19, 9:17 AM CDT | Flash Flood Warning | LOT | 4 hr |
| Jun 19, 9:35 AM CDT | Severe Thunderstorm Warning | LOT | 70 min |
| Jun 19, 1:08 PM CDT | Flash Flood Watch | LOT | 8 hr |
| Jun 19, 1:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 5:36 PM CDT | Flash Flood Warning | LOT | 6 hr |
| Jun 19, 6:12 PM CDT | Severe Thunderstorm Warning | LOT | 63 min |
| Jun 19, 8:26 PM CDT | River Flood Advisory | LOT | 8 days |
| Jun 19, 8:37 PM CDT | River Flood Warning | LOT | 47 hr |
| Jun 19, 11:29 PM CDT | Areal Flood Warning | LOT | 10 hr |
| Jun 20, 4:48 AM CDT | River Flood Watch | LOT | 15 hr |
| Jun 22, 3:15 PM CDT | Heat Advisory | LOT | 52 hr |
| Jun 25, 10:18 AM CDT | Heat Advisory | LOT | 9 hr |
| Jun 25, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 1:19 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 27, 2:41 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 27, 5:36 PM CDT | Severe Thunderstorm Warning | LOT | 69 min |
| Jun 27, 6:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 5, 3:58 AM CDT | Dense Fog Advisory | LOT | 5 hr |
| Jul 11, 2:31 AM CDT | Mesoscale Discussion | SPC | 29 min |
| Jul 23, 11:53 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 24, 3:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 24, 5:02 PM CDT | Tornado Watch | SPC | 6 hr |
| Jul 24, 7:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 24, 9:22 PM CDT | Special Weather Statement | LOT | 83 min |
| Jul 24, 9:52 PM CDT | Wind Advisory | LOT | 68 min |
| Jul 30, 4:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 4, 4:29 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Aug 8, 4:07 AM CDT | Heat Advisory | LOT | 38 hr |
| Aug 9, 9:55 AM CDT | Mesoscale Discussion | SPC | 35 min |
| Aug 9, 10:21 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 9, 5:52 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 9, 8:30 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 9, 10:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 9, 11:03 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 26, 1:59 PM CDT | Flash Flood Watch | LOT | 37 hr |
| Sep 9, 9:19 PM CDT | Dense Fog Advisory | LOT | 12 hr |
| Sep 10, 8:44 PM CDT | Dense Fog Advisory | LOT | 11 hr |
| Sep 12, 9:43 PM CDT | Dense Fog Advisory | LOT | 11 hr |
| Sep 24, 7:36 AM CDT | Dense Fog Advisory | LOT | 53 min |
| Sep 27, 5:55 AM CDT | Dense Fog Advisory | LOT | 4 hr |
| Sep 27, 5:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 27, 8:22 PM CDT | Tornado Watch | SPC | 3 hr |
| Sep 28, 4:29 AM CDT | Wind Advisory | LOT | 15 hr |
| Sep 29, 3:26 PM CDT | Frost Advisory | LOT | 17 hr |
| Oct 6, 9:09 PM CDT | Wind Advisory | LOT | 5 hr |
| Oct 9, 4:37 AM CDT | Frost Advisory | LOT | 24 hr |
| Oct 9, 4:00 PM CDT | Freeze Warning | LOT | 41 hr |
| Oct 23, 10:30 AM CDT | River Flood Advisory | LOT | 32 hr |
| Oct 27, 4:15 AM CDT | Dense Fog Advisory | LOT | 6 hr |
| Oct 29, 9:19 PM CDT | River Flood Advisory | LOT | 37 hr |
| Nov 23, 7:07 AM CST | Dense Fog Advisory | LOT | 3 hr |
| Nov 23, 9:40 PM CST | Dense Fog Advisory | LOT | 11 hr |
| Dec 6, 3:42 PM CST | Winter Storm Watch | LOT | 30 hr |
| Dec 7, 9:35 PM CST | Winter Storm Warning | LOT | 42 hr |
| Dec 7, 9:35 PM CST | Winter Weather Advisory | LOT | 50 hr |
| Dec 8, 11:22 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 8, 6:00 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 10:22 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 9, 3:20 PM CST | Wind Chill Advisory | LOT | 20 hr |
| Dec 12, 3:20 PM CST | Winter Weather Advisory | LOT | 4 hr |
| Dec 12, 7:35 PM CST | Freezing Rain Advisory | LOT | 14 hr |
| Dec 14, 3:57 AM CST | Dense Fog Advisory | LOT | 9 hr |
| Dec 22, 11:31 AM CST | Winter Storm Watch | LOT | 17 hr |
| Dec 22, 3:35 PM CST | Winter Weather Advisory | LOT | 29 hr |
| Dec 23, 3:45 AM CST | Flood Watch | LOT | 55 hr |
| Dec 23, 12:21 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 6:41 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 8:46 PM CST | Ice Storm Warning | LOT | 18 hr |
| Dec 24, 11:25 PM CST | Areal Flood Warning | LOT | 12 hr |
| Dec 25, 8:59 AM CST | River Flood Advisory | LOT | 36 hr |
| Dec 25, 9:24 PM CST | River Flood Advisory | LOT | 36 hr |
| Dec 26, 9:33 AM CST | Winter Weather Advisory | LOT | 11 hr |
| Dec 27, 8:41 PM CST | River Flood Advisory | LOT | 5 days |
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 archive20082010
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.