Alert archive / Idaho / Canyon County
Weather alerts in Canyon County, Idaho, 2011
24 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 24
- Warnings
- 2
- Watches
- 1
- Advisories
- 13
- Busiest month
- January5 alerts
- Busiest day
- January 25, 20112 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, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 3 | 0% | |||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 17 | 9 | 47% | 25 | 60% | 16 min |
| NWS Missoula, MT: flash flood warnings | 4 | 0 | 100% | 0 | ||
| NWS Spokane, WA: tornado warnings | 0 | 1 | 0% | |||
| NWS Spokane, WA: severe thunderstorm warnings | 3 | 2 | 33% | 6 | 50% | 8 min |
| NWS Spokane, WA: flash flood warnings | 2 | 0 | 100% | 2 | 0% | |
| NWS Boise, ID: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Boise, ID: severe thunderstorm warnings | 13 | 2 | 85% | 16 | 19% | 26 min |
| NWS Boise, ID: flash flood warnings | 0 | 1 | 0% | |||
| NWS Pocatello, ID: tornado warnings | 3 | 0 | 100% | 0 | ||
| NWS Pocatello, ID: severe thunderstorm warnings | 55 | 10 | 82% | 35 | 49% | 20 min |
| NWS Pocatello, ID: flash flood warnings | 11 | 3 | 73% | 7 | 71% | 55 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 15, 6:14 AM MST | Dense Fog Advisory | BOI | 15 hr |
| Jan 22, 3:15 AM MST | Dense Fog Advisory | BOI | 9 hr |
| Jan 22, 8:37 PM MST | Dense Fog Advisory | BOI | 12 hr |
| Jan 25, 6:04 AM MST | Dense Fog Advisory | BOI | 7 hr |
| Jan 25, 2:55 PM MST | Dense Fog Advisory | BOI | 11 hr |
| Feb 18, 2:44 PM MST | Winter Weather Advisory | BOI | 32 hr |
| Mar 20, 3:17 AM MDT | Wind Advisory | BOI | 17 hr |
| Mar 27, 9:32 PM MDT | Special Weather Statement | BOI | 43 min |
| Apr 21, 5:52 AM MDT | Areal Flood Advisory | BOI | 98 min |
| Apr 25, 3:48 AM MDT | Wind Advisory | BOI | 13 hr |
| May 3, 1:25 PM MDT | River Flood Warning | BOI | 3 hr |
| May 7, 1:41 PM MDT | Wind Advisory | BOI | 54 hr |
| May 14, 12:25 PM MDT | Mesoscale Discussion | SPC | 65 min |
| May 14, 4:53 PM MDT | Mesoscale Discussion | SPC | 67 min |
| Jun 22, 5:39 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jun 28, 10:34 PM MDT | Special Weather Statement | BOI | 26 min |
| Jul 7, 3:04 PM MDT | Special Weather Statement | BOI | 41 min |
| Jul 7, 3:36 PM MDT | Special Weather Statement | BOI | 24 min |
| Jul 31, 7:54 PM MDT | Special Weather Statement | BOI | 51 min |
| Oct 23, 2:59 AM MDT | Freeze Watch | BOI | 12 hr |
| Oct 23, 2:34 PM MDT | Freeze Warning | BOI | 43 hr |
| Nov 11, 3:08 AM MST | Wind Advisory | BOI | 36 hr |
| Dec 2, 3:45 AM MST | Wind Advisory | BOI | 14 hr |
| Dec 3, 2:37 PM MST | Wind Advisory | BOI | 26 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 | |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 5 |
| Flooding | |
| River Flood Warning | 1 |
| Areal Flood Advisory | 1 |
| Winter | |
| Winter Weather Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.