Alert archive / Illinois / Monroe County
Weather alerts in Monroe County, Illinois, 2026
96 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Monroe County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 96
- Warnings
- 25
- Watches
- 25
- Advisories
- 20
- Busiest month
- April19 alerts
- Busiest day
- March 15, 20266 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 2 tornado warnings covering Monroe County in 2026 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 1 minutes after it went out.
Monroe County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 2 | 0% | 2 | 50% | 1 min |
| Severe thunderstorm warnings | 11 | 7 | 36% | 1 | 100% | 21 min |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 80 | 18 | 78% | 57 | 61% | 20 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 258 | 110 | 57% | 561 | 76% | 21 min |
| NWS St. Louis, MO: flash flood warnings | 61 | 25 | 59% | 82 | 76% | 97 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 8, 3:14 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Jan 21, 2:42 AM CST | Winter Storm Watch | LSX | 35 hr |
| Jan 22, 2:29 AM CST | Cold Weather Advisory | LSX | 58 hr |
| Jan 22, 1:15 PM CST | Winter Storm Warning | LSX | 3 days |
| Jan 24, 1:38 PM CST | Cold Weather Advisory | LSX | 46 hr |
| Jan 25, 1:55 AM CST | Extreme Cold Warning | LSX | 34 hr |
| Jan 26, 1:49 AM CST | Cold Weather Advisory | LSX | 25 hr |
| Feb 15, 6:31 PM CST | Dense Fog Advisory | LSX | 11 hr |
| Feb 19, 4:23 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Feb 19, 10:44 AM CST | Mesoscale Discussion | SPC | 91 min |
| Feb 19, 3:06 PM CST | Mesoscale Discussion | SPC | 84 min |
| Mar 6, 12:38 AM CST | Dense Fog Advisory | LSX | 5 hr |
| Mar 6, 10:28 PM CST | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 7, 2:44 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 11, 4:35 AM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Mar 14, 10:45 AM CDT | Wind Advisory | LSX | 49 hr |
| Mar 15, 12:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 15, 1:33 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 15, 5:01 PM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Mar 15, 5:19 PM CDT | Tornado Warning | LSX | 47 min |
| Mar 15, 5:28 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| Mar 15, 5:34 PM CDT | Tornado Warning | LSX | 34 min |
| Mar 27, 11:40 AM CDT | Freeze Warning | LSX | 21 hr |
| Mar 29, 1:27 PM CDT | Red Flag Warning | LSX | 5 hr |
| Apr 2, 3:46 AM CDT | Wind Advisory | LSX | 15 hr |
| Apr 2, 5:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 6:50 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 15, 10:15 PM CDT | Severe Thunderstorm Warning | LSX | 21 min |
| Apr 17, 3:04 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Apr 17, 3:31 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 17, 8:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 4:07 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 27, 7:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Apr 27, 11:18 AM CDT | Flood Watch | LSX | 10 hr |
| Apr 27, 11:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 12:50 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 27, 3:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 7:12 PM CDT | Severe Thunderstorm Warning | LSX | 63 min |
| Apr 27, 7:24 PM CDT | Severe Thunderstorm Warning | LSX | 51 min |
| Apr 27, 7:56 PM CDT | Severe Thunderstorm Warning | LSX | 64 min |
| Apr 27, 8:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Apr 28, 11:38 AM CDT | River Flood Warning | LSX | 4 days |
| Apr 28, 1:32 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 3, 8:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| May 9, 12:15 AM CDT | Dense Fog Advisory | LSX | 7 hr |
| May 18, 1:12 AM CDT | Flood Watch | LSX | 35 hr |
| May 18, 2:00 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 18, 5:06 PM CDT | Flash Flood Warning | LSX | 4 hr |
| May 18, 8:56 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jun 1, 3:34 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 1, 4:02 AM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 1, 6:01 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 7, 1:26 PM CDT | Flood Watch | LSX | 40 hr |
| Jun 8, 11:44 AM CDT | Heat Advisory | LSX | 32 hr |
| Jun 9, 12:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 11, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 16, 12:39 PM CDT | Wind Advisory | LSX | 31 hr |
| Jun 17, 2:14 PM CDT | Tornado Watch | SPC | 11 hr |
| Jun 20, 1:28 AM CDT | Flood Watch | LSX | 45 hr |
| Jun 21, 10:06 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 21, 1:28 PM CDT | Tornado Watch | SPC | 9 hr |
| Jun 24, 11:53 AM CDT | Flood Watch | LSX | 62 hr |
| Jun 25, 1:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 1:59 AM CDT | Extreme Heat Watch | LSX | 11 hr |
| Jun 27, 1:15 PM CDT | Extreme Heat Warning | LSX | 7 days |
| Jul 4, 12:17 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 4, 2:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 4, 4:42 PM CDT | Severe Thunderstorm Warning | LSX | 63 min |
| Jul 9, 11:03 AM CDT | Flood Watch | LSX | 56 hr |
| Jul 10, 1:23 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 10, 4:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 10, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 10, 7:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 10, 9:30 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 10, 9:58 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Jul 17, 11:01 AM CDT | Heat Advisory | LSX | 4 days |
| Jul 24, 1:12 AM CDT | Extreme Heat Watch | LSX | 11 hr |
| Jul 24, 12:15 PM CDT | Heat Advisory | LSX | 47 hr |
| Jul 26, 12:40 AM CDT | Extreme Heat Warning | LSX | 66 hr |
| Jul 31, 9:30 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 5, 1:57 AM CDT | Flood Watch | LSX | 35 hr |
| Aug 8, 2:05 AM CDT | Extreme Heat Watch | LSX | 23 hr |
| Aug 9, 1:05 AM CDT | Extreme Heat Warning | LSX | 8 days |
| Aug 12, 4:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Aug 16, 3:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 16, 8:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 16, 9:17 PM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| Aug 19, 8:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 30, 12:27 PM CDT | Heat Advisory | LSX | 3 days |
| Aug 30, 12:27 PM CDT | Extreme Heat Watch | LSX | 11 hr |
| Sep 3, 12:12 AM CDT | Extreme Heat Warning | LSX | 68 hr |
| Sep 9, 2:40 AM CDT | Heat Advisory | LSX | 16 hr |
| Sep 9, 11:37 PM CDT | Severe Thunderstorm Warning | LSX | 27 min |
| Sep 14, 11:30 AM CDT | Heat Advisory | LSX | 5 days |
| Sep 20, 6:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 20, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
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 | 11 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 6 |
| Mesoscale Discussion | 26 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 1 |
| Flood Watch | 7 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Heat | |
| Extreme Heat Warning | 4 |
| Extreme Heat Watch | 4 |
| Heat Advisory | 6 |
| Cold | |
| Extreme Cold Warning | 1 |
| Freeze Warning | 1 |
| Cold Weather Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
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.