Alert archive / Illinois / Mercer County
Weather alerts in Mercer County, Illinois, 2022
114 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mercer County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 114
- Warnings
- 31
- Watches
- 9
- Advisories
- 36
- Busiest month
- August22 alerts
- Busiest day
- August 20, 20229 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 3 tornado warnings covering Mercer County in 2022 had a tornado report inside them; 4 of 5 tornado reports fell inside a warning, on average 25 minutes after it went out.
Mercer County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 5 | 80% | 25 min |
| Severe thunderstorm warnings | 17 | 5 | 71% | 4 | 100% | 16 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 30 | 11 | 63% | 19 | 74% | 16 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 175 | 91 | 48% | 235 | 78% | 19 min |
| NWS Quad Cities, IA: flash flood warnings | 26 | 13 | 50% | 26 | 77% | 99 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 1, 2:27 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 4, 3:08 AM CST | Winter Weather Advisory | DVN | 39 hr |
| Jan 6, 2:02 AM CST | Wind Chill Advisory | DVN | 31 hr |
| Jan 7, 2:05 PM CST | Winter Weather Advisory | DVN | 34 hr |
| Jan 13, 2:47 PM CST | Winter Weather Advisory | DVN | 44 hr |
| Jan 16, 8:26 AM CST | Dense Fog Advisory | DVN | 97 min |
| Jan 19, 2:13 AM CST | Wind Chill Advisory | DVN | 34 hr |
| Jan 25, 3:27 AM CST | Wind Chill Advisory | DVN | 30 hr |
| Feb 1, 2:54 AM CST | Winter Weather Advisory | DVN | 39 hr |
| Feb 15, 3:06 PM CST | Winter Storm Watch | DVN | 12 hr |
| Feb 16, 3:30 AM CST | Winter Weather Advisory | DVN | 39 hr |
| Feb 18, 8:38 PM CST | Snow Squall Warning | DVN | 52 min |
| Feb 18, 9:31 PM CST | Snow Squall Warning | DVN | 59 min |
| Feb 18, 9:37 PM CST | Special Weather Statement | DVN | 53 min |
| Feb 23, 2:55 PM CST | Winter Weather Advisory | DVN | 36 hr |
| Mar 5, 3:27 AM CST | Wind Advisory | DVN | 27 hr |
| Mar 5, 6:10 PM CST | Tornado Watch | SPC | 4 hr |
| Mar 5, 7:51 PM CST | Mesoscale Discussion | SPC | 114 min |
| Mar 5, 8:02 PM CST | Severe Thunderstorm Warning | DVN | 43 min |
| Mar 5, 8:26 PM CST | Severe Thunderstorm Warning | DVN | 49 min |
| Mar 5, 8:44 PM CST | Tornado Warning | DVN | 17 min |
| Mar 6, 3:05 PM CST | Winter Weather Advisory | DVN | 21 hr |
| Mar 25, 3:10 AM CDT | Wind Advisory | DVN | 19 hr |
| Apr 13, 2:26 PM CDT | Wind Advisory | DVN | 29 hr |
| Apr 22, 10:46 AM CDT | River Flood Watch | DVN | 6 days |
| Apr 23, 10:40 AM CDT | River Flood Warning | DVN | 3 days |
| Apr 25, 3:02 AM CDT | Freeze Warning | DVN | 29 hr |
| Apr 26, 2:39 PM CDT | Frost Advisory | DVN | 17 hr |
| Apr 30, 12:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 11, 10:08 AM CDT | Heat Advisory | DVN | 11 hr |
| May 12, 2:48 AM CDT | Heat Advisory | DVN | 17 hr |
| May 13, 4:27 PM CDT | Special Weather Statement | DVN | 33 min |
| May 13, 4:34 PM CDT | Severe Thunderstorm Warning | DVN | 41 min |
| May 13, 4:36 PM CDT | Severe Thunderstorm Warning | DVN | 24 min |
| May 13, 4:54 PM CDT | Severe Thunderstorm Warning | DVN | 19 min |
| May 20, 7:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 6:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 25, 8:07 PM CDT | Special Weather Statement | DVN | 38 min |
| May 26, 12:34 PM CDT | Severe Thunderstorm Warning | DVN | 41 min |
| May 31, 6:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 6, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 8, 10:42 AM CDT | Special Weather Statement | DVN | 63 min |
| Jun 12, 2:40 PM CDT | Heat Advisory | DVN | 3 days |
| Jun 14, 2:58 AM CDT | Excessive Heat Warning | DVN | 41 hr |
| Jun 15, 6:21 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 15, 7:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 15, 11:58 PM CDT | Special Weather Statement | DVN | 32 min |
| Jun 20, 2:16 PM CDT | Heat Advisory | DVN | 29 hr |
| Jun 25, 4:43 AM CDT | Special Weather Statement | DVN | 62 min |
| Jun 25, 5:44 AM CDT | Special Weather Statement | DVN | 76 min |
| Jun 25, 6:23 AM CDT | Severe Thunderstorm Warning | DVN | 52 min |
| Jun 25, 2:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 25, 5:02 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 6:21 PM CDT | Severe Thunderstorm Warning | DVN | 39 min |
| Jun 25, 7:00 PM CDT | Special Weather Statement | DVN | 30 min |
| Jun 25, 7:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 4, 3:30 AM CDT | Heat Advisory | DVN | 34 hr |
| Jul 5, 1:09 PM CDT | Excessive Heat Warning | DVN | 7 hr |
| Jul 5, 10:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 5, 10:31 PM CDT | Severe Thunderstorm Warning | DVN | 59 min |
| Jul 8, 1:13 PM CDT | Special Weather Statement | DVN | 62 min |
| Jul 8, 3:13 PM CDT | Special Weather Statement | DVN | 32 min |
| Jul 11, 7:29 AM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 15, 2:07 AM CDT | Special Weather Statement | DVN | 38 min |
| Jul 22, 3:26 AM CDT | Heat Advisory | DVN | 41 hr |
| Jul 22, 10:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 23, 2:05 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 2:12 AM CDT | Severe Thunderstorm Warning | DVN | 33 min |
| Aug 1, 2:49 AM CDT | Special Weather Statement | DVN | 41 min |
| Aug 1, 3:16 AM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Aug 2, 2:44 AM CDT | Heat Advisory | DVN | 17 hr |
| Aug 2, 5:36 AM CDT | Special Weather Statement | DVN | 39 min |
| Aug 3, 9:13 AM CDT | Special Weather Statement | DVN | 32 min |
| Aug 3, 12:20 PM CDT | Special Weather Statement | DVN | 25 min |
| Aug 5, 2:46 AM CDT | Heat Advisory | DVN | 42 hr |
| Aug 6, 12:22 PM CDT | Excessive Heat Warning | DVN | 9 hr |
| Aug 19, 7:12 PM CDT | Severe Thunderstorm Warning | DVN | 48 min |
| Aug 19, 8:31 PM CDT | Severe Thunderstorm Warning | DVN | 29 min |
| Aug 19, 8:58 PM CDT | Special Weather Statement | DVN | 62 min |
| Aug 19, 9:19 PM CDT | Severe Thunderstorm Warning | DVN | 41 min |
| Aug 20, 12:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 1:35 PM CDT | Tornado Warning | DVN | 40 min |
| Aug 20, 1:56 PM CDT | Tornado Warning | DVN | 30 min |
| Aug 20, 2:30 PM CDT | Severe Thunderstorm Warning | DVN | 45 min |
| Aug 20, 4:33 PM CDT | Special Weather Statement | DVN | 117 min |
| Aug 21, 1:27 AM CDT | Dense Fog Advisory | DVN | 7 hr |
| Aug 29, 9:42 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 10:12 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 29, 10:13 AM CDT | Severe Thunderstorm Warning | DVN | 34 min |
| Sep 6, 2:31 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Sep 18, 6:11 PM CDT | Tornado Watch | SPC | 6 hr |
| Sep 18, 8:41 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 27, 1:53 PM CDT | Frost Advisory | DVN | 18 hr |
| Sep 28, 3:00 PM CDT | Frost Advisory | DVN | 16 hr |
| Oct 6, 2:32 PM CDT | Freeze Watch | DVN | 12 hr |
| Oct 7, 2:19 AM CDT | Freeze Warning | DVN | 31 hr |
| Oct 13, 2:52 AM CDT | Red Flag Warning | DVN | 16 hr |
| Oct 22, 10:31 AM CDT | Red Flag Warning | DVN | 8 hr |
| Oct 24, 8:56 PM CDT | Special Weather Statement | DVN | 49 min |
| Nov 4, 2:51 AM CDT | Wind Advisory | DVN | 40 hr |
| Nov 4, 2:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Nov 4, 3:42 PM CDT | Special Weather Statement | DVN | 78 min |
| Nov 5, 8:01 AM CDT | Severe Thunderstorm Warning | DVN | 29 min |
| Nov 14, 2:24 PM CST | Winter Weather Advisory | DVN | 30 hr |
| Dec 2, 2:52 AM CST | Wind Advisory | DVN | 26 hr |
| Dec 7, 3:36 AM CST | Dense Fog Advisory | DVN | 8 hr |
| Dec 9, 9:31 PM CST | Dense Fog Advisory | DVN | 14 hr |
| Dec 12, 2:25 PM CST | Wind Advisory | DVN | 31 hr |
| Dec 19, 2:42 PM CST | Winter Storm Watch | DVN | 37 hr |
| Dec 20, 2:34 PM CST | Winter Storm Warning | DVN | 4 days |
| Dec 22, 10:59 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 24, 3:10 AM CST | Winter Weather Advisory | DVN | 9 hr |
| Dec 24, 2:01 PM CST | Wind Chill Advisory | DVN | 20 hr |
| Dec 25, 12:16 PM CST | Winter Weather Advisory | DVN | 24 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 17 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 19 |
| Flooding | |
| River Flood Warning | 1 |
| River Flood Watch | 1 |
| Winter | |
| Snow Squall Warning | 2 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 10 |
| Heat | |
| Excessive Heat Warning | 3 |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
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.