Alert archive / Montana / Cascade County
Weather alerts in Cascade County, Montana, 2020
135 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Cascade County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 135
- Warnings
- 30
- Watches
- 16
- Advisories
- 2
- Busiest month
- August32 alerts
- Busiest day
- May 19, 20209 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Cascade County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 5 | 64% | 6 | 67% | 11 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Great Falls, MT: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Great Falls, MT: severe thunderstorm warnings | 65 | 27 | 58% | 108 | 44% | 14 min |
| NWS Great Falls, MT: flash flood warnings | 1 | 0 | 100% | 0 |
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 |
|---|---|---|---|
| Jan 29, 10:02 PM MST | Special Weather Statement | TFX | 118 min |
| Jan 30, 1:54 PM MST | Fire Weather Watch | TFX | 24 hr |
| Jan 31, 3:28 AM MST | Red Flag Warning | TFX | 43 hr |
| Feb 11, 10:17 PM MST | Special Weather Statement | TFX | 88 min |
| Feb 17, 5:24 PM MST | Special Weather Statement | TFX | 81 min |
| Feb 23, 7:10 PM MST | Special Weather Statement | TFX | 50 min |
| Feb 23, 7:47 PM MST | Special Weather Statement | TFX | 43 min |
| Feb 24, 4:28 PM MST | Special Weather Statement | TFX | 62 min |
| Feb 25, 5:43 AM MST | Special Weather Statement | TFX | 92 min |
| Mar 4, 10:33 AM MST | Special Weather Statement | TFX | 42 min |
| Mar 11, 5:55 PM MDT | Special Weather Statement | TFX | 50 min |
| Mar 11, 7:16 PM MDT | Special Weather Statement | TFX | 119 min |
| Apr 23, 8:31 PM MDT | Special Weather Statement | TFX | 29 min |
| Apr 30, 2:42 PM MDT | Special Weather Statement | TFX | 48 min |
| Apr 30, 4:25 PM MDT | Special Weather Statement | TFX | 50 min |
| Apr 30, 4:55 PM MDT | Special Weather Statement | TFX | 35 min |
| May 6, 4:04 PM MDT | Special Weather Statement | TFX | 41 min |
| May 6, 4:58 PM MDT | Special Weather Statement | TFX | 62 min |
| May 8, 1:40 PM MDT | Special Weather Statement | TFX | 80 min |
| May 8, 2:55 PM MDT | Special Weather Statement | TFX | 80 min |
| May 12, 1:32 PM MDT | Special Weather Statement | TFX | 118 min |
| May 18, 5:23 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 18, 7:12 PM MDT | Severe Thunderstorm Warning | TFX | 33 min |
| May 18, 7:37 PM MDT | Severe Thunderstorm Warning | TFX | 23 min |
| May 18, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | 26 min |
| May 18, 9:03 PM MDT | Special Weather Statement | TFX | 27 min |
| May 18, 10:22 PM MDT | Special Weather Statement | TFX | 38 min |
| May 19, 1:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 19, 2:34 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 19, 4:39 PM MDT | Severe Thunderstorm Warning | TFX | 36 min |
| May 19, 5:10 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 6:02 PM MDT | Special Weather Statement | TFX | 28 min |
| May 20, 1:25 AM MDT | Special Weather Statement | TFX | 35 min |
| May 20, 1:44 AM MDT | Special Weather Statement | TFX | 31 min |
| May 20, 2:00 AM MDT | Severe Thunderstorm Warning | TFX | 45 min |
| May 20, 9:35 PM MDT | Areal Flood Advisory | TFX | 35 hr |
| May 30, 5:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jun 5, 7:09 PM MDT | Special Weather Statement | TFX | 36 min |
| Jun 5, 7:36 PM MDT | Severe Thunderstorm Warning | TFX | 24 min |
| Jun 5, 8:17 PM MDT | Special Weather Statement | TFX | 28 min |
| Jun 6, 7:58 PM MDT | Special Weather Statement | TFX | 32 min |
| Jun 7, 7:25 PM MDT | Special Weather Statement | TFX | 50 min |
| Jun 14, 5:03 PM MDT | Special Weather Statement | TFX | 27 min |
| Jun 19, 2:18 PM MDT | Special Weather Statement | TFX | 27 min |
| Jun 19, 2:29 PM MDT | Special Weather Statement | TFX | 31 min |
| Jun 19, 2:44 PM MDT | Special Weather Statement | TFX | 31 min |
| Jun 19, 2:57 PM MDT | Special Weather Statement | TFX | 33 min |
| Jun 19, 3:12 PM MDT | Special Weather Statement | TFX | 33 min |
| Jun 19, 3:35 PM MDT | Special Weather Statement | TFX | 25 min |
| Jun 19, 9:27 PM MDT | Special Weather Statement | TFX | 33 min |
| Jun 24, 6:30 PM MDT | Special Weather Statement | TFX | 30 min |
| Jun 24, 6:52 PM MDT | Special Weather Statement | TFX | 53 min |
| Jun 24, 7:44 PM MDT | Special Weather Statement | TFX | 31 min |
| Jul 3, 6:54 PM MDT | Severe Thunderstorm Warning | TFX | 39 min |
| Jul 3, 6:58 PM MDT | Special Weather Statement | TFX | 47 min |
| Jul 3, 7:07 PM MDT | Severe Thunderstorm Warning | TFX | 53 min |
| Jul 4, 2:27 PM MDT | Special Weather Statement | TFX | 33 min |
| Jul 4, 2:54 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 4, 3:39 PM MDT | Severe Thunderstorm Warning | TFX | 25 min |
| Jul 4, 4:12 PM MDT | Special Weather Statement | TFX | 33 min |
| Jul 4, 4:26 PM MDT | Special Weather Statement | TFX | 34 min |
| Jul 4, 4:58 PM MDT | Special Weather Statement | TFX | 32 min |
| Jul 7, 12:39 PM MDT | Special Weather Statement | TFX | 51 min |
| Jul 7, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 22, 4:46 PM MDT | Special Weather Statement | TFX | 44 min |
| Jul 23, 2:43 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 23, 3:29 PM MDT | Special Weather Statement | TFX | 31 min |
| Jul 23, 3:48 PM MDT | Special Weather Statement | TFX | 27 min |
| Jul 23, 3:57 PM MDT | Special Weather Statement | TFX | 33 min |
| Jul 23, 4:04 PM MDT | Severe Thunderstorm Warning | TFX | 26 min |
| Jul 23, 4:33 PM MDT | Areal Flood Advisory | TFX | 3 hr |
| Jul 23, 4:33 PM MDT | Special Weather Statement | TFX | 42 min |
| Jul 24, 9:16 PM MDT | Special Weather Statement | TFX | 29 min |
| Jul 24, 9:49 PM MDT | Special Weather Statement | TFX | 26 min |
| Jul 30, 8:33 PM MDT | Special Weather Statement | TFX | 42 min |
| Aug 3, 8:50 AM MDT | Special Weather Statement | TFX | 40 min |
| Aug 5, 3:01 PM MDT | Fire Weather Watch | TFX | 23 hr |
| Aug 5, 7:57 PM MDT | Special Weather Statement | TFX | 33 min |
| Aug 5, 8:28 PM MDT | Special Weather Statement | TFX | 32 min |
| Aug 5, 9:05 PM MDT | Special Weather Statement | TFX | 25 min |
| Aug 6, 1:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 6, 2:23 PM MDT | Red Flag Warning | TFX | 31 hr |
| Aug 6, 4:31 PM MDT | Special Weather Statement | TFX | 29 min |
| Aug 6, 5:45 PM MDT | Special Weather Statement | TFX | 30 min |
| Aug 6, 6:45 PM MDT | Special Weather Statement | TFX | 30 min |
| Aug 6, 7:16 PM MDT | Special Weather Statement | TFX | 44 min |
| Aug 6, 7:28 PM MDT | Severe Thunderstorm Warning | TFX | 32 min |
| Aug 6, 8:21 PM MDT | Special Weather Statement | TFX | 24 min |
| Aug 9, 2:27 PM MDT | Fire Weather Watch | TFX | 21 hr |
| Aug 10, 11:42 AM MDT | Red Flag Warning | TFX | 57 hr |
| Aug 16, 1:48 PM MDT | Fire Weather Watch | TFX | 38 hr |
| Aug 17, 8:37 AM MDT | Red Flag Warning | TFX | 12 hr |
| Aug 18, 3:29 AM MDT | Red Flag Warning | TFX | 65 hr |
| Aug 20, 2:44 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 2:55 PM MDT | Severe Thunderstorm Warning | TFX | 35 min |
| Aug 20, 3:28 PM MDT | Severe Thunderstorm Warning | TFX | 32 min |
| Aug 20, 3:55 PM MDT | Special Weather Statement | TFX | 35 min |
| Aug 20, 3:57 PM MDT | Special Weather Statement | TFX | 33 min |
| Aug 20, 4:08 PM MDT | Special Weather Statement | TFX | 22 min |
| Aug 20, 4:17 PM MDT | Severe Thunderstorm Warning | TFX | 28 min |
| Aug 20, 4:30 PM MDT | Special Weather Statement | TFX | 45 min |
| Aug 25, 4:40 PM MDT | Special Weather Statement | TFX | 20 min |
| Aug 25, 4:58 PM MDT | Special Weather Statement | TFX | 32 min |
| Aug 28, 4:01 AM MDT | Fire Weather Watch | TFX | 11 hr |
| Aug 28, 2:36 PM MDT | Red Flag Warning | TFX | 33 hr |
| Aug 30, 2:54 PM MDT | Fire Weather Watch | TFX | 12 hr |
| Aug 31, 3:09 AM MDT | Red Flag Warning | TFX | 66 hr |
| Sep 3, 2:50 PM MDT | Fire Weather Watch | TFX | 21 hr |
| Sep 4, 11:21 AM MDT | Fire Weather Watch | TFX | 16 hr |
| Sep 4, 11:21 AM MDT | Red Flag Warning | TFX | 33 hr |
| Sep 12, 3:47 AM MDT | Fire Weather Watch | TFX | 24 hr |
| Sep 13, 3:17 AM MDT | Red Flag Warning | TFX | 40 hr |
| Sep 22, 2:46 PM MDT | Fire Weather Watch | TFX | 24 hr |
| Sep 23, 2:37 PM MDT | Red Flag Warning | TFX | 30 hr |
| Oct 2, 9:19 AM MDT | Fire Weather Watch | TFX | 29 hr |
| Oct 3, 1:58 PM MDT | Red Flag Warning | TFX | 31 hr |
| Oct 6, 3:05 AM MDT | Red Flag Warning | TFX | 16 hr |
| Oct 6, 2:15 PM MDT | Fire Weather Watch | TFX | 18 hr |
| Oct 7, 7:55 AM MDT | Red Flag Warning | TFX | 35 hr |
| Oct 8, 1:57 PM MDT | Fire Weather Watch | TFX | 12 hr |
| Oct 9, 1:46 AM MDT | Red Flag Warning | TFX | 42 hr |
| Oct 21, 1:03 PM MDT | Snow Squall Warning | TFX | 57 min |
| Oct 21, 2:00 PM MDT | Snow Squall Warning | TFX | 60 min |
| Oct 23, 4:25 AM MDT | Special Weather Statement | TFX | 3 hr |
| Nov 7, 7:53 PM MST | Mesoscale Discussion | SPC | 6 hr |
| Nov 7, 11:20 PM MST | Special Weather Statement | TFX | 115 min |
| Nov 8, 4:47 AM MST | Special Weather Statement | TFX | 118 min |
| Nov 11, 2:43 AM MST | Special Weather Statement | TFX | 2 hr |
| Nov 11, 4:57 AM MST | Special Weather Statement | TFX | 2 hr |
| Nov 11, 7:20 AM MST | Special Weather Statement | TFX | 85 min |
| Nov 21, 2:43 PM MST | Special Weather Statement | TFX | 2 hr |
| Nov 25, 12:43 PM MST | Special Weather Statement | TFX | 62 min |
| Nov 25, 1:24 PM MST | Special Weather Statement | TFX | 51 min |
| Nov 25, 2:45 PM MST | Special Weather Statement | TFX | 30 min |
| Nov 25, 3:50 PM MST | Special Weather Statement | TFX | 25 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 | 14 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 8 |
| Special Weather Statement | 79 |
| Flooding | |
| Areal Flood Advisory | 2 |
| Winter | |
| Snow Squall Warning | 2 |
| Fire | |
| Red Flag Warning | 14 |
| Fire Weather Watch | 13 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.