Alert archive / Illinois / Montgomery County
Weather alerts in Montgomery County, Illinois, 2009
114 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 114
- Warnings
- 27
- Watches
- 23
- Advisories
- 28
- Busiest month
- June31 alerts
- Busiest day
- August 19, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Montgomery County in 2009 had a tornado report inside them.
Montgomery County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 17 | 5 | 71% | 6 | 17% | 48 min |
| Flash flood warnings | 5 | 2 | 60% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS St. Louis, MO: tornado warnings | 62 | 12 | 81% | 30 | 80% | 19 min |
| NWS St. Louis, MO: severe thunderstorm warnings | 214 | 84 | 61% | 316 | 59% | 20 min |
| NWS St. Louis, MO: flash flood warnings | 97 | 48 | 51% | 138 | 78% | 120 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 3, 6:07 PM CST | Dense Fog Advisory | LSX | 9 hr |
| Jan 5, 3:42 PM CST | Winter Weather Advisory | LSX | 17 hr |
| Jan 14, 3:42 AM CST | Wind Chill Advisory | LSX | 39 hr |
| Jan 26, 4:05 AM CST | Winter Weather Advisory | LSX | 44 hr |
| Jan 27, 6:25 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 9, 4:01 PM CST | Flash Flood Watch | LSX | 44 hr |
| Feb 10, 3:41 PM CST | Wind Advisory | LSX | 26 hr |
| Feb 26, 9:26 AM CST | Mesoscale Discussion | SPC | 2 hr |
| Feb 26, 7:42 PM CST | Mesoscale Discussion | SPC | 93 min |
| Mar 5, 10:17 AM CST | Wind Advisory | LSX | 8 hr |
| Mar 8, 6:32 AM CDT | Tornado Watch | SPC | 7 hr |
| Mar 8, 9:26 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Mar 8, 11:16 AM CDT | Severe Thunderstorm Warning | LSX | 44 min |
| Mar 8, 11:35 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Mar 8, 12:16 PM CDT | Wind Advisory | LSX | 7 hr |
| Mar 10, 3:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 18, 2:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Mar 24, 3:58 AM CDT | Wind Advisory | LSX | 14 hr |
| Mar 26, 3:34 PM CDT | Winter Storm Watch | LSX | 36 hr |
| Mar 28, 3:31 AM CDT | Winter Weather Advisory | LSX | 24 hr |
| Mar 29, 4:15 AM CDT | Winter Weather Advisory | LSX | 3 hr |
| Apr 5, 10:50 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Apr 29, 3:53 AM CDT | Flash Flood Watch | LSX | 36 hr |
| May 7, 5:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| May 7, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 13, 9:13 AM CDT | Severe Thunderstorm Warning | LSX | 47 min |
| May 13, 9:27 AM CDT | Mesoscale Discussion | SPC | 63 min |
| May 13, 3:04 PM CDT | Flash Flood Watch | LSX | 12 hr |
| May 13, 9:56 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 13, 11:27 PM CDT | Mesoscale Discussion | SPC | 93 min |
| May 13, 11:57 PM CDT | Severe Thunderstorm Warning | LSX | 33 min |
| May 14, 3:51 PM CDT | Flash Flood Watch | LSX | 32 hr |
| May 15, 2:05 PM CDT | Mesoscale Discussion | SPC | 25 min |
| May 15, 2:39 PM CDT | Tornado Watch | SPC | 7 hr |
| May 15, 5:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| May 15, 7:47 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| May 15, 8:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 12:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 25, 3:34 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| May 26, 1:18 PM CDT | Flash Flood Warning | LSX | 6 hr |
| May 29, 3:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 30, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 30, 6:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 2, 11:58 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 2, 12:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 2, 3:29 PM CDT | Severe Thunderstorm Warning | LSX | 31 min |
| Jun 2, 3:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 2, 6:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 8, 7:54 AM CDT | Severe Thunderstorm Warning | LSX | 35 min |
| Jun 8, 11:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 3:20 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 8, 4:33 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 10, 3:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 10, 7:10 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 10, 7:46 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 10, 8:58 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jun 11, 1:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 11, 2:20 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| Jun 15, 3:42 PM CDT | Flash Flood Watch | LSX | 20 hr |
| Jun 17, 3:05 PM CDT | Heat Advisory | LSX | 52 hr |
| Jun 18, 3:20 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 5:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Jun 19, 5:44 PM CDT | Severe Thunderstorm Warning | LSX | 31 min |
| Jun 19, 5:50 PM CDT | Severe Thunderstorm Warning | LSX | 55 min |
| Jun 19, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Jun 19, 6:30 PM CDT | Severe Thunderstorm Warning | LSX | 45 min |
| Jun 19, 7:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 19, 8:09 PM CDT | Severe Thunderstorm Warning | LSX | 36 min |
| Jun 19, 9:45 PM CDT | Mesoscale Discussion | SPC | 30 min |
| Jun 20, 6:34 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| Jun 21, 2:24 PM CDT | Heat Advisory | LSX | 6 days |
| Jun 24, 4:35 PM CDT | Areal Flood Advisory | LSX | 6 hr |
| Jun 27, 5:54 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 11, 6:14 AM CDT | Areal Flood Advisory | LSX | 4 hr |
| Jul 11, 6:47 AM CDT | Flash Flood Warning | LSX | 4 hr |
| Jul 15, 8:57 AM CDT | Areal Flood Advisory | LSX | 5 hr |
| Jul 16, 8:20 PM CDT | Severe Thunderstorm Warning | LSX | 40 min |
| Jul 25, 12:57 AM CDT | Severe Thunderstorm Warning | LSX | 63 min |
| Jul 25, 1:26 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 25, 1:54 AM CDT | Severe Thunderstorm Warning | LSX | 66 min |
| Aug 3, 4:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 4, 7:39 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 4, 8:56 AM CDT | Severe Thunderstorm Warning | LSX | 49 min |
| Aug 16, 5:39 PM CDT | Areal Flood Advisory | LSX | 3 hr |
| Aug 19, 11:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 19, 12:49 PM CDT | Tornado Watch | SPC | 6 hr |
| Aug 19, 3:08 PM CDT | Severe Thunderstorm Warning | LSX | 22 min |
| Aug 19, 3:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 19, 3:20 PM CDT | Flash Flood Watch | LSX | 13 hr |
| Aug 19, 3:34 PM CDT | Tornado Warning | LSX | 22 min |
| Aug 19, 4:21 PM CDT | Severe Thunderstorm Warning | LSX | 39 min |
| Aug 19, 5:52 PM CDT | Severe Thunderstorm Warning | LSX | 23 min |
| Sep 6, 9:04 PM CDT | Dense Fog Advisory | LSX | 12 hr |
| Sep 26, 3:55 AM CDT | Dense Fog Advisory | LSX | 5 hr |
| Sep 26, 1:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Oct 7, 4:18 AM CDT | Flash Flood Watch | LSX | 47 hr |
| Oct 8, 8:51 AM CDT | Flash Flood Warning | LSX | 4 hr |
| Oct 8, 12:42 PM CDT | Flash Flood Warning | LSX | 5 hr |
| Oct 8, 5:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 8, 6:04 PM CDT | Areal Flood Warning | LSX | 18 hr |
| Oct 10, 3:55 AM CDT | Freeze Warning | LSX | 23 hr |
| Oct 17, 4:22 AM CDT | Frost Advisory | LSX | 29 hr |
| Oct 22, 10:06 PM CDT | Areal Flood Advisory | LSX | 5 hr |
| Oct 28, 3:58 PM CDT | Flash Flood Watch | LSX | 47 hr |
| Oct 30, 7:34 AM CDT | Flash Flood Warning | LSX | 5 hr |
| Oct 30, 1:04 PM CDT | Areal Flood Warning | LSX | 9 hr |
| Oct 30, 9:53 PM CDT | Areal Flood Warning | LSX | 11 hr |
| Dec 8, 2:48 PM CST | Wind Advisory | LSX | 25 hr |
| Dec 22, 3:39 PM CST | Flood Watch | LSX | 61 hr |
| Dec 24, 5:45 PM CST | Areal Flood Advisory | LSX | 6 hr |
| Dec 24, 11:30 PM CST | Areal Flood Advisory | LSX | 6 hr |
| Dec 27, 3:09 AM CST | Winter Weather Advisory | LSX | 13 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 | 1 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 36 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 8 |
| Flood Watch | 1 |
| Areal Flood Advisory | 11 |
| Winter | |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 5 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
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.