Alert archive / Idaho / Canyon County
Weather alerts in Canyon County, Idaho, 2010
62 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 62
- Warnings
- 17
- Watches
- 5
- Advisories
- 27
- Busiest month
- December15 alerts
- Busiest day
- June 29, 20104 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, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 3 | 73% | 0 | ||
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Boise, ID: severe thunderstorm warnings | 49 | 8 | 84% | 23 | 39% | 19 min |
| NWS Boise, ID: flash flood warnings | 12 | 3 | 75% | 14 | 64% | 36 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 |
|---|---|---|---|
| Jan 2, 6:31 AM MST | Dense Fog Advisory | BOI | 28 hr |
| Jan 3, 2:56 PM MST | Dense Fog Advisory | BOI | 19 hr |
| Jan 6, 6:38 AM MST | Dense Fog Advisory | BOI | 4 hr |
| Jan 13, 3:12 PM MST | Dense Fog Advisory | BOI | 19 hr |
| Jan 14, 5:34 PM MST | Dense Fog Advisory | BOI | 17 hr |
| Jan 27, 3:37 PM MST | Dense Fog Advisory | BOI | 12 hr |
| Feb 7, 4:53 AM MST | Dense Fog Advisory | BOI | 6 hr |
| Feb 7, 2:44 PM MST | Dense Fog Advisory | BOI | 15 hr |
| Feb 26, 1:06 PM MST | Wind Advisory | BOI | 3 hr |
| Mar 12, 12:01 PM MST | Wind Advisory | BOI | 30 hr |
| Apr 7, 2:20 PM MDT | Wind Advisory | BOI | 30 hr |
| Apr 20, 5:57 PM MDT | Severe Thunderstorm Warning | BOI | 48 min |
| Apr 20, 6:30 PM MDT | Severe Thunderstorm Warning | BOI | 37 min |
| Apr 27, 4:37 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 1:57 PM MDT | Wind Advisory | BOI | 70 hr |
| May 10, 4:05 AM MDT | Wind Advisory | BOI | 41 hr |
| May 17, 1:48 PM MDT | Mesoscale Discussion | SPC | 57 min |
| May 17, 7:45 PM MDT | Severe Thunderstorm Warning | BOI | 45 min |
| May 22, 9:19 PM MDT | Freeze Warning | BOI | 12 hr |
| Jun 4, 1:37 PM MDT | Severe Thunderstorm Warning | BOI | 53 min |
| Jun 6, 4:23 PM MDT | Severe Thunderstorm Warning | BOI | 67 min |
| Jun 14, 9:51 PM MDT | Special Weather Statement | BOI | 69 min |
| Jun 19, 6:10 PM MDT | Special Weather Statement | BOI | 50 min |
| Jun 20, 6:20 PM MDT | Special Weather Statement | BOI | 40 min |
| Jun 20, 10:47 PM MDT | Special Weather Statement | BOI | 58 min |
| Jun 24, 6:37 PM MDT | Special Weather Statement | BOI | 38 min |
| Jun 28, 7:37 PM MDT | Special Weather Statement | BOI | 53 min |
| Jun 28, 8:05 PM MDT | Special Weather Statement | BOI | 55 min |
| Jun 29, 1:41 PM MDT | Mesoscale Discussion | SPC | 64 min |
| Jun 29, 5:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jun 29, 6:39 PM MDT | Severe Thunderstorm Warning | BOI | 51 min |
| Jun 29, 6:40 PM MDT | Severe Thunderstorm Warning | BOI | 65 min |
| Jun 29, 7:13 PM MDT | Severe Thunderstorm Warning | BOI | 47 min |
| Jul 28, 1:23 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jul 28, 1:41 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 8:07 PM MDT | Flash Flood Warning | BOI | 83 min |
| Aug 6, 8:44 PM MDT | Flash Flood Watch | BOI | 5 hr |
| Aug 8, 6:53 PM MDT | Severe Thunderstorm Warning | BOI | 52 min |
| Aug 8, 7:42 PM MDT | Severe Thunderstorm Warning | BOI | 48 min |
| Aug 21, 9:41 PM MDT | Severe Thunderstorm Warning | BOI | 64 min |
| Aug 21, 11:10 PM MDT | Special Weather Statement | BOI | 50 min |
| Aug 26, 3:09 AM MDT | High Wind Warning | BOI | 21 hr |
| Nov 21, 4:30 AM MST | Winter Storm Watch | BOI | 15 hr |
| Nov 21, 7:58 PM MST | Winter Storm Warning | BOI | 43 hr |
| Nov 26, 12:49 PM MST | Winter Weather Advisory | BOI | 39 hr |
| Nov 29, 2:43 PM MST | Winter Weather Advisory | BOI | 53 hr |
| Nov 30, 1:02 PM MST | Winter Storm Warning | BOI | 23 hr |
| Dec 2, 3:44 AM MST | Winter Weather Advisory | BOI | 25 hr |
| Dec 3, 5:31 PM MST | Dense Fog Advisory | BOI | 14 hr |
| Dec 5, 2:55 PM MST | Winter Weather Advisory | BOI | 23 hr |
| Dec 5, 10:06 PM MST | Dense Fog Advisory | BOI | 8 hr |
| Dec 6, 2:39 PM MST | Dense Fog Advisory | BOI | 20 hr |
| Dec 9, 5:48 AM MST | Dense Fog Advisory | BOI | 9 hr |
| Dec 10, 3:34 PM MST | Winter Weather Advisory | BOI | 29 hr |
| Dec 12, 9:47 AM MST | Dense Fog Advisory | BOI | 5 hr |
| Dec 12, 4:27 PM MST | Dense Fog Advisory | BOI | 17 hr |
| Dec 14, 10:59 AM MST | Wind Advisory | BOI | 8 hr |
| Dec 16, 2:25 PM MST | Winter Storm Watch | BOI | 22 hr |
| Dec 17, 12:40 PM MST | Winter Weather Advisory | BOI | 24 hr |
| Dec 18, 3:01 PM MST | Winter Weather Advisory | BOI | 31 hr |
| Dec 26, 2:32 PM MST | Winter Storm Watch | BOI | 48 hr |
| Dec 27, 2:31 PM MST | Winter Storm Warning | BOI | 44 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 | 11 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 8 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Cold | |
| Freeze Warning | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
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.