Alert archive / Montana / Madison County
Weather alerts in Madison County, Montana, 2008
63 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Madison County and its neighbors
Each county as a circle sized by its count in 2008. Tap one for its archive.
- Alerts
- 63
- Warnings
- 36
- Watches
- 12
- Advisories
- 3
- Busiest month
- August32 alerts
- Busiest day
- August 9, 20089 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Madison County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 11 | 31% | 13 | 69% | 15 min |
| Flash flood warnings | 3 | 1 | 67% | 0 |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: tornado warnings | 7 | 0 | 100% | 3 | 0% | |
| NWS Great Falls, MT: severe thunderstorm warnings | 141 | 74 | 48% | 141 | 72% | 19 min |
| NWS Great Falls, MT: flash flood warnings | 3 | 1 | 67% | 3 | 33% | 3 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 6:43 PM MDT | Severe Thunderstorm Warning | TFX | 47 min |
| May 21, 2:31 PM MDT | River Flood Warning | TFX | 18 hr |
| May 22, 11:43 AM MDT | River Flood Warning | TFX | 4 days |
| May 23, 10:46 AM MDT | River Flood Warning | TFX | 3 days |
| Jun 2, 1:19 PM MDT | Mesoscale Discussion | SPC | 86 min |
| Jun 10, 9:54 AM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 12, 8:18 PM MDT | Areal Flood Advisory | TFX | 16 hr |
| Jun 13, 12:09 PM MDT | Areal Flood Advisory | TFX | 24 hr |
| Jun 16, 2:14 PM MDT | Areal Flood Advisory | TFX | 14 days |
| Jun 17, 2:09 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jun 17, 5:48 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 21, 6:09 PM MDT | Severe Thunderstorm Warning | TFX | 51 min |
| Jun 22, 4:31 PM MDT | Severe Thunderstorm Warning | TFX | 89 min |
| Jul 1, 1:26 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 1:34 PM MDT | Severe Thunderstorm Warning | TFX | 41 min |
| Jul 1, 2:19 PM MDT | Severe Thunderstorm Warning | TFX | 41 min |
| Jul 4, 1:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 4, 2:04 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 4, 5:45 PM MDT | Mesoscale Discussion | SPC | 60 min |
| Jul 4, 8:36 PM MDT | Mesoscale Discussion | SPC | 54 min |
| Jul 9, 1:56 PM MDT | Fire Weather Watch | MSO | 14 hr |
| Jul 10, 4:01 AM MDT | Red Flag Warning | MSO | 18 hr |
| Jul 22, 1:00 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 3:38 PM MDT | Severe Thunderstorm Warning | TFX | 67 min |
| Jul 22, 4:32 PM MDT | Flash Flood Warning | TFX | 118 min |
| Jul 22, 4:53 PM MDT | Severe Thunderstorm Warning | TFX | 67 min |
| Jul 22, 5:04 PM MDT | Flash Flood Warning | TFX | 3 hr |
| Jul 22, 6:20 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 22, 6:29 PM MDT | Flash Flood Warning | TFX | 2 hr |
| Jul 30, 8:24 AM MDT | Red Flag Warning | MSO | 13 hr |
| Jul 31, 3:11 PM MDT | Fire Weather Watch | BYZ | 14 hr |
| Aug 1, 3:43 AM MDT | Red Flag Warning | MSO | 17 hr |
| Aug 1, 5:07 AM MDT | Red Flag Warning | BYZ | 19 hr |
| Aug 2, 4:47 PM MDT | Mesoscale Discussion | SPC | 58 min |
| Aug 5, 2:32 PM MDT | Fire Weather Watch | MSO | 41 hr |
| Aug 7, 3:45 AM MDT | Red Flag Warning | MSO | 29 hr |
| Aug 8, 2:52 PM MDT | Severe Thunderstorm Warning | TFX | 53 min |
| Aug 8, 3:43 PM MDT | Severe Thunderstorm Warning | TFX | 47 min |
| Aug 9, 11:46 AM MDT | Mesoscale Discussion | SPC | 59 min |
| Aug 9, 12:16 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 9, 12:40 PM MDT | Severe Thunderstorm Warning | TFX | 65 min |
| Aug 9, 1:15 PM MDT | Severe Thunderstorm Warning | TFX | 46 min |
| Aug 9, 2:34 PM MDT | Severe Thunderstorm Warning | TFX | 56 min |
| Aug 9, 3:59 PM MDT | Severe Thunderstorm Warning | TFX | 46 min |
| Aug 9, 4:44 PM MDT | Severe Thunderstorm Warning | TFX | 61 min |
| Aug 9, 5:50 PM MDT | Mesoscale Discussion | SPC | 55 min |
| Aug 9, 5:51 PM MDT | Severe Thunderstorm Warning | TFX | 39 min |
| Aug 9, 6:30 PM MDT | Severe Thunderstorm Warning | TFX | 60 min |
| Aug 17, 1:54 PM MDT | Red Flag Warning | MSO | 54 hr |
| Aug 18, 2:46 PM MDT | Fire Weather Watch | MSO | 13 hr |
| Aug 19, 4:44 AM MDT | Red Flag Warning | BYZ | 16 hr |
| Aug 19, 12:43 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Aug 21, 2:18 PM MDT | Red Flag Warning | MSO | 6 hr |
| Aug 24, 2:21 AM MDT | Fire Weather Watch | BYZ | 25 hr |
| Aug 24, 4:33 AM MDT | Fire Weather Watch | MSO | 16 hr |
| Aug 24, 4:42 PM MDT | Red Flag Warning | MSO | 4 hr |
| Aug 24, 8:47 PM MDT | Red Flag Warning | MSO | 26 hr |
| Aug 25, 3:31 AM MDT | Red Flag Warning | BYZ | 38 hr |
| Aug 27, 3:41 AM MDT | Red Flag Warning | BYZ | 17 hr |
| Aug 28, 2:58 PM MDT | Fire Weather Watch | MSO | 24 hr |
| Aug 29, 4:26 AM MDT | Fire Weather Watch | BYZ | 11 hr |
| Aug 29, 2:49 PM MDT | Red Flag Warning | MSO | 30 hr |
| Aug 29, 3:45 PM MDT | Red Flag Warning | BYZ | 29 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 | 16 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 12 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 3 |
| Areal Flood Advisory | 3 |
| Fire | |
| Red Flag Warning | 14 |
| Fire Weather Watch | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20072009
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.