Alert archive / Idaho / Canyon County
Weather alerts in Canyon County, Idaho, 2019
57 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Canyon County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 57
- Warnings
- 11
- Watches
- 7
- Advisories
- 20
- Busiest month
- September10 alerts
- Busiest day
- May 26, 20196 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Canyon County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 0 | 100% | 1 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: tornado warnings | 1 | 0 | 100% | 3 | 0% | |
| NWS Boise, ID: severe thunderstorm warnings | 40 | 9 | 78% | 29 | 45% | 9 min |
| NWS Boise, ID: flash flood warnings | 2 | 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 20, 2:55 AM MST | Wind Advisory | BOI | 41 hr |
| Feb 7, 1:38 PM MST | Winter Storm Watch | BOI | 13 hr |
| Feb 8, 3:02 AM MST | Winter Storm Warning | BOI | 56 hr |
| Feb 8, 3:02 AM MST | Winter Weather Advisory | BOI | 56 hr |
| Feb 19, 3:37 AM MST | Winter Weather Advisory | BOI | 55 hr |
| Feb 26, 3:20 AM MST | Winter Weather Advisory | BOI | 32 hr |
| Feb 27, 5:06 AM MST | Winter Weather Advisory | BOI | 6 hr |
| Apr 20, 2:19 PM MDT | Special Weather Statement | BOI | 26 min |
| May 25, 8:30 PM MDT | Special Weather Statement | BOI | 45 min |
| May 25, 8:37 PM MDT | Special Weather Statement | BOI | 53 min |
| May 26, 1:36 PM MDT | Severe Thunderstorm Warning | BOI | 18 min |
| May 26, 4:33 PM MDT | Special Weather Statement | BOI | 42 min |
| May 26, 4:55 PM MDT | Special Weather Statement | BOI | 50 min |
| May 26, 5:46 PM MDT | Special Weather Statement | BOI | 44 min |
| May 27, 4:21 PM MDT | Mesoscale Discussion | SPC | 114 min |
| May 29, 11:47 PM MDT | Special Weather Statement | BOI | 43 min |
| Jun 12, 6:45 PM MDT | Severe Thunderstorm Warning | BOI | 30 min |
| Jun 12, 7:13 PM MDT | Severe Thunderstorm Warning | BOI | 32 min |
| Jun 12, 8:31 PM MDT | Special Weather Statement | BOI | 29 min |
| Jul 6, 6:45 PM MDT | Special Weather Statement | BOI | 45 min |
| Jul 12, 9:20 PM MDT | Severe Thunderstorm Warning | BOI | 40 min |
| Jul 22, 1:28 PM MDT | Red Flag Warning | BOI | 35 hr |
| Aug 7, 2:01 PM MDT | Red Flag Warning | BOI | 3 days |
| Aug 8, 8:20 AM MDT | Fire Weather Watch | BOI | 6 hr |
| Aug 10, 11:41 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 1:36 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 10, 4:53 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 7:27 PM MDT | Special Weather Statement | BOI | 48 min |
| Aug 10, 9:26 PM MDT | Special Weather Statement | BOI | 49 min |
| Aug 10, 10:10 PM MDT | Special Weather Statement | BOI | 50 min |
| Aug 21, 10:09 AM MDT | Wind Advisory | BOI | 17 hr |
| Sep 3, 2:43 PM MDT | Fire Weather Watch | BOI | 23 hr |
| Sep 4, 1:33 PM MDT | Red Flag Warning | BOI | 40 hr |
| Sep 5, 7:44 PM MDT | Special Weather Statement | BOI | 46 min |
| Sep 6, 7:56 AM MDT | Red Flag Warning | BOI | 10 hr |
| Sep 6, 8:56 AM MDT | Special Weather Statement | BOI | 49 min |
| Sep 6, 9:53 AM MDT | Special Weather Statement | BOI | 52 min |
| Sep 6, 4:05 PM MDT | Severe Thunderstorm Warning | BOI | 55 min |
| Sep 19, 4:34 AM MDT | Dense Fog Advisory | BOI | 4 hr |
| Sep 29, 3:37 AM MDT | Frost Advisory | BOI | 10 hr |
| Sep 29, 3:37 AM MDT | Freeze Warning | BOI | 29 hr |
| Oct 8, 3:19 AM MDT | Wind Advisory | BOI | 40 hr |
| Oct 19, 11:31 AM MDT | Special Weather Statement | BOI | 29 min |
| Oct 28, 2:09 PM MDT | Wind Advisory | BOI | 22 hr |
| Nov 1, 12:58 PM MDT | Air Stagnation Advisory | BOI | 4 days |
| Nov 7, 2:33 PM MST | Air Stagnation Advisory | BOI | 8 days |
| Nov 16, 2:48 AM MST | Air Stagnation Advisory | BOI | 56 hr |
| Nov 25, 11:40 AM MST | Winter Storm Watch | BOI | 16 hr |
| Nov 25, 11:56 AM MST | High Wind Watch | BOI | 19 hr |
| Nov 26, 3:27 AM MST | Winter Weather Advisory | BOI | 38 hr |
| Nov 30, 3:28 AM MST | Winter Storm Watch | BOI | 10 hr |
| Nov 30, 1:35 PM MST | Winter Weather Advisory | BOI | 49 hr |
| Dec 3, 2:48 AM MST | Dense Fog Advisory | BOI | 9 hr |
| Dec 3, 9:45 AM MST | Air Stagnation Advisory | BOI | 3 days |
| Dec 4, 3:14 AM MST | Dense Fog Advisory | BOI | 8 hr |
| Dec 4, 9:59 PM MST | Dense Fog Advisory | BOI | 13 hr |
| Dec 17, 1:40 PM MST | Winter Weather Advisory | BOI | 57 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 | 5 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 16 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 4 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Air Stagnation Advisory | 4 |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.