Alert archive / Illinois / Montgomery County
Weather alerts in Montgomery County, Illinois, 2010
155 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Montgomery County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 155
- Warnings
- 40
- Watches
- 36
- Advisories
- 39
- Busiest month
- June34 alerts
- Busiest day
- April 5, 201011 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 10 tornado warnings covering Montgomery County in 2010 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Montgomery County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 10 | 2 | 80% | 1 | 0% | |
| Severe thunderstorm warnings | 15 | 9 | 40% | 2 | 50% | 22 min |
| Flash flood warnings | 7 | 3 | 57% | 2 | 100% | 25 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 94 | 16 | 83% | 43 | 84% | 33 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 301 | 122 | 59% | 404 | 62% | 23 min |
| NWS St. Louis, MO: flash flood warnings | 112 | 44 | 61% | 122 | 73% | 122 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 5, 3:50 PM CST | Winter Storm Watch | LSX | 12 hr |
| Jan 6, 4:16 AM CST | Winter Storm Warning | LSX | 24 hr |
| Jan 6, 4:16 AM CST | Winter Weather Advisory | LSX | 37 hr |
| Jan 7, 3:54 PM CST | Wind Chill Advisory | LSX | 43 hr |
| Jan 15, 3:42 PM CST | Freezing Fog Advisory | LSX | 20 hr |
| Jan 16, 2:33 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 17, 2:12 PM CST | Dense Fog Advisory | LSX | 22 hr |
| Jan 18, 3:00 PM CST | Dense Fog Advisory | LSX | 21 hr |
| Jan 20, 3:55 PM CST | Dense Fog Advisory | LSX | 17 hr |
| Feb 4, 4:08 AM CST | Winter Weather Advisory | LSX | 44 hr |
| Feb 6, 4:18 AM CST | Winter Storm Watch | LSX | 36 hr |
| Feb 7, 3:55 PM CST | Winter Weather Advisory | LSX | 45 hr |
| Feb 12, 3:29 PM CST | Winter Weather Advisory | LSX | 63 hr |
| Mar 10, 7:48 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 11, 1:21 AM CST | Mesoscale Discussion | SPC | 54 min |
| Apr 4, 8:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Apr 4, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 4, 10:30 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Apr 4, 10:48 PM CDT | Tornado Warning | LSX | 42 min |
| Apr 4, 11:29 PM CDT | Tornado Warning | LSX | 46 min |
| Apr 4, 11:51 PM CDT | Tornado Warning | LSX | 39 min |
| Apr 5, 2:50 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Apr 5, 2:51 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 5, 3:28 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| Apr 5, 4:07 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Apr 5, 4:16 PM CDT | Tornado Warning | LSX | 32 min |
| Apr 6, 11:16 AM CDT | Wind Advisory | LSX | 5 hr |
| Apr 7, 12:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 7, 1:24 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 7, 2:11 PM CDT | Severe Thunderstorm Warning | LSX | 34 min |
| Apr 8, 4:16 AM CDT | Frost Advisory | LSX | 29 hr |
| Apr 15, 4:48 AM CDT | Red Flag Warning | LSX | 13 hr |
| Apr 17, 3:34 PM CDT | Frost Advisory | LSX | 16 hr |
| Apr 24, 3:20 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 24, 5:03 PM CDT | Tornado Warning | LSX | 57 min |
| Apr 24, 5:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Apr 24, 5:57 PM CDT | Tornado Warning | LSX | 38 min |
| Apr 24, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | 27 min |
| Apr 30, 2:40 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 30, 7:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Apr 30, 8:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 30, 9:03 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 30, 11:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 1, 9:45 PM CDT | Mesoscale Discussion | SPC | 30 min |
| May 1, 10:14 PM CDT | Tornado Watch | SPC | 7 hr |
| May 3, 12:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| May 3, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 3, 5:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 3, 5:47 PM CDT | Severe Thunderstorm Warning | LSX | 43 min |
| May 8, 4:02 AM CDT | Frost Advisory | LSX | 27 hr |
| May 13, 5:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| May 13, 7:24 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| May 17, 5:35 AM CDT | Areal Flood Advisory | LSX | 6 hr |
| May 21, 11:26 PM CDT | Dense Fog Advisory | LSX | 7 hr |
| May 26, 2:49 PM CDT | Areal Flood Advisory | LSX | 5 hr |
| Jun 1, 11:49 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 2, 1:31 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 2, 2:01 AM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Jun 5, 9:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 12, 12:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 12, 1:31 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 12, 3:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jun 12, 4:35 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Jun 13, 11:55 AM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 13, 12:24 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 13, 2:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 13, 6:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 14, 1:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 14, 2:17 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 14, 3:01 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jun 14, 3:19 PM CDT | Severe Thunderstorm Warning | LSX | 41 min |
| Jun 15, 11:55 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 15, 12:29 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 15, 2:14 PM CDT | Severe Thunderstorm Warning | LSX | 46 min |
| Jun 15, 2:36 PM CDT | Tornado Warning | LSX | 23 min |
| Jun 15, 2:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 4:14 AM CDT | Heat Advisory | LSX | 6 days |
| Jun 18, 11:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 19, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 19, 5:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 21, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 21, 4:10 PM CDT | Mesoscale Discussion | SPC | 35 min |
| Jun 21, 9:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 22, 10:03 AM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 22, 10:35 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 1:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 27, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 27, 7:10 PM CDT | Areal Flood Advisory | LSX | 4 hr |
| Jun 27, 7:39 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 8, 10:07 AM CDT | Areal Flood Advisory | LSX | 3 hr |
| Jul 11, 8:18 PM CDT | Flash Flood Warning | LSX | 5 hr |
| Jul 13, 2:35 PM CDT | Heat Advisory | LSX | 52 hr |
| Jul 15, 11:32 AM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 16, 4:06 PM CDT | Heat Advisory | LSX | 38 hr |
| Jul 18, 5:58 AM CDT | Mesoscale Discussion | SPC | 32 min |
| Jul 18, 6:22 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 18, 8:49 AM CDT | Severe Thunderstorm Warning | LSX | 56 min |
| Jul 19, 10:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 19, 10:38 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 12:13 PM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| Jul 19, 7:44 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 20, 5:08 AM CDT | Flash Flood Watch | LSX | 22 hr |
| Jul 21, 12:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 21, 3:39 PM CDT | Heat Advisory | LSX | 3 days |
| Jul 24, 10:20 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Jul 25, 4:32 AM CDT | Areal Flood Warning | LSX | 14 hr |
| Jul 27, 1:33 PM CDT | Flash Flood Warning | LSX | 2 hr |
| Jul 27, 3:50 PM CDT | Heat Advisory | LSX | 28 hr |
| Aug 1, 3:13 PM CDT | Heat Advisory | LSX | 3 days |
| Aug 3, 4:43 AM CDT | Excessive Heat Warning | LSX | 39 hr |
| Aug 4, 2:27 PM CDT | Mesoscale Discussion | SPC | 33 min |
| Aug 4, 3:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 6, 2:56 PM CDT | Excessive Heat Watch | LSX | 49 hr |
| Aug 8, 3:55 AM CDT | Excessive Heat Warning | LSX | 7 days |
| Sep 2, 3:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Sep 2, 4:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Sep 2, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 2, 7:12 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 8:14 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| Sep 2, 8:38 PM CDT | Flash Flood Warning | LSX | 6 hr |
| Sep 2, 8:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Sep 2, 10:07 PM CDT | Flash Flood Warning | LSX | 4 hr |
| Sep 3, 2:40 AM CDT | Areal Flood Warning | LSX | 7 hr |
| Sep 8, 3:48 PM CDT | Flash Flood Watch | LSX | 27 hr |
| Sep 11, 2:40 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| Sep 18, 5:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 19, 4:00 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 3, 3:48 PM CDT | Frost Advisory | LSX | 16 hr |
| Oct 4, 4:16 AM CDT | Frost Advisory | LSX | 28 hr |
| Oct 24, 3:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 25, 3:22 PM CDT | Wind Advisory | LSX | 26 hr |
| Oct 25, 9:36 PM CDT | Mesoscale Discussion | SPC | 24 min |
| Oct 26, 2:21 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Oct 26, 3:28 AM CDT | Tornado Watch | SPC | 8 hr |
| Oct 26, 4:33 AM CDT | Severe Thunderstorm Warning | LSX | 57 min |
| Oct 26, 5:15 AM CDT | Tornado Warning | LSX | 30 min |
| Oct 26, 5:30 AM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Oct 27, 3:53 PM CDT | Freeze Watch | LSX | 12 hr |
| Oct 28, 3:47 AM CDT | Freeze Warning | LSX | 29 hr |
| Nov 7, 3:57 PM CST | Red Flag Warning | LSX | 26 hr |
| Nov 22, 4:50 PM CST | Tornado Watch | SPC | 7 hr |
| Nov 22, 7:31 PM CST | Mesoscale Discussion | SPC | 89 min |
| Nov 24, 12:25 PM CST | Areal Flood Advisory | LSX | 5 hr |
| Nov 24, 3:48 PM CST | Flash Flood Watch | LSX | 12 hr |
| Nov 25, 3:31 AM CST | Areal Flood Advisory | LSX | 6 hr |
| Dec 11, 4:15 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 11, 4:09 PM CST | Wind Advisory | LSX | 29 hr |
| Dec 12, 4:19 AM CST | Wind Chill Advisory | LSX | 30 hr |
| Dec 12, 4:19 AM CST | Winter Weather Advisory | LSX | 17 hr |
| Dec 15, 4:00 AM CST | Winter Weather Advisory | LSX | 32 hr |
| Dec 23, 12:07 PM CST | Winter Weather Advisory | LSX | 40 hr |
| Dec 31, 4:05 AM CST | Mesoscale Discussion | SPC | 115 min |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | 8 hr |
| Dec 31, 11:59 AM CST | Tornado Warning | LSX | 61 min |
| Dec 31, 12:38 PM CST | Tornado Warning | LSX | 67 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 | 15 |
| Tornado Warning | 10 |
| Severe Thunderstorm Watch | 19 |
| Tornado Watch | 10 |
| Mesoscale Discussion | 40 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 7 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 9 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 8 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.