Alert archive / Idaho / Boise County
Weather alerts in Boise County, Idaho, 2023
69 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Boise County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 69
- Warnings
- 13
- Watches
- 9
- Advisories
- 27
- Busiest month
- August26 alerts
- Busiest day
- August 29, 20235 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Boise County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 1 | 0% | |
| Flash flood warnings | 3 | 0 | 100% | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: tornado warnings | 0 | 3 | 0% | |||
| NWS Boise, ID: severe thunderstorm warnings | 40 | 8 | 80% | 40 | 45% | 11 min |
| NWS Boise, ID: flash flood warnings | 13 | 3 | 77% | 4 | 75% | 62 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 8, 1:30 PM MST | Winter Weather Advisory | BOI | 30 hr |
| Jan 30, 12:32 PM MST | Air Stagnation Advisory | BOI | 4 days |
| Feb 19, 2:18 PM MST | Winter Storm Watch | BOI | 13 hr |
| Feb 20, 3:18 AM MST | Winter Storm Warning | BOI | 35 hr |
| Feb 26, 2:07 AM MST | Winter Weather Advisory | BOI | 18 hr |
| Feb 28, 2:15 PM MST | Winter Weather Advisory | BOI | 15 hr |
| Mar 3, 2:51 PM MST | Winter Weather Advisory | BOI | 38 hr |
| Mar 8, 1:06 PM MST | Winter Storm Watch | BOI | 14 hr |
| Mar 8, 6:35 PM MST | Snow Squall Warning | BOI | 40 min |
| Mar 9, 3:15 AM MST | Winter Storm Warning | BOI | 35 hr |
| Mar 14, 9:56 AM MDT | Winter Weather Advisory | BOI | 23 hr |
| Mar 30, 5:24 AM MDT | Winter Weather Advisory | BOI | 13 hr |
| May 1, 9:31 AM MDT | River Flood Watch | BOI | 34 hr |
| May 1, 11:42 AM MDT | Areal Flood Advisory | BOI | 8 days |
| May 2, 7:33 PM MDT | River Flood Warning | BOI | 62 hr |
| May 4, 3:02 PM MDT | River Flood Advisory | BOI | 8 hr |
| May 8, 7:29 PM MDT | Special Weather Statement | BOI | 46 min |
| May 21, 6:24 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| May 21, 6:42 PM MDT | Dust Storm Advisory | BOI | 63 min |
| May 21, 8:46 PM MDT | Special Weather Statement | BOI | 29 min |
| May 30, 3:55 PM MDT | Flash Flood Warning | BOI | 47 min |
| May 30, 4:25 PM MDT | Areal Flood Advisory | BOI | 2 hr |
| May 30, 4:48 PM MDT | Areal Flood Advisory | BOI | 2 hr |
| May 30, 5:16 PM MDT | Areal Flood Advisory | BOI | 2 hr |
| Jun 2, 6:35 PM MDT | Areal Flood Advisory | BOI | 115 min |
| Jun 6, 7:56 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Jun 7, 5:24 PM MDT | Severe Thunderstorm Warning | BOI | 51 min |
| Jun 8, 3:02 AM MDT | Flood Watch | BOI | 18 hr |
| Jun 13, 5:18 PM MDT | Special Weather Statement | BOI | 42 min |
| Jun 13, 6:07 PM MDT | Special Weather Statement | BOI | 53 min |
| Jun 13, 11:21 PM MDT | Severe Thunderstorm Warning | BOI | 39 min |
| Jul 13, 12:59 PM MDT | Heat Advisory | BOI | 3 days |
| Jul 20, 1:04 PM MDT | Heat Advisory | BOI | 3 days |
| Aug 1, 2:56 PM MDT | Red Flag Warning | BOI | 19 min |
| Aug 1, 3:15 PM MDT | Fire Weather Watch | BOI | 22 hr |
| Aug 2, 1:31 PM MDT | Red Flag Warning | BOI | 57 hr |
| Aug 2, 7:17 PM MDT | Flash Flood Warning | BOI | 3 hr |
| Aug 3, 3:28 PM MDT | Special Weather Statement | BOI | 47 min |
| Aug 3, 5:54 PM MDT | Areal Flood Advisory | BOI | 109 min |
| Aug 6, 1:39 PM MDT | Special Weather Statement | BOI | 51 min |
| Aug 7, 5:11 PM MDT | Special Weather Statement | BOI | 64 min |
| Aug 7, 6:11 PM MDT | Special Weather Statement | BOI | 64 min |
| Aug 7, 6:16 PM MDT | Flash Flood Warning | BOI | 3 hr |
| Aug 13, 1:36 PM MDT | Heat Advisory | BOI | 4 days |
| Aug 19, 1:44 AM MDT | Flood Watch | BOI | 68 hr |
| Aug 20, 1:34 AM MDT | Wind Advisory | BOI | 36 hr |
| Aug 22, 3:21 AM MDT | Flood Watch | BOI | 21 hr |
| Aug 22, 4:52 PM MDT | Special Weather Statement | BOI | 38 min |
| Aug 22, 5:56 PM MDT | Areal Flood Advisory | BOI | 6 hr |
| Aug 22, 7:40 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Aug 22, 8:46 PM MDT | Severe Thunderstorm Warning | BOI | 44 min |
| Aug 26, 2:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Aug 26, 11:20 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Aug 29, 2:50 PM MDT | Special Weather Statement | BOI | 40 min |
| Aug 29, 3:20 PM MDT | Special Weather Statement | BOI | 40 min |
| Aug 29, 3:22 PM MDT | Special Weather Statement | BOI | 38 min |
| Aug 29, 3:59 PM MDT | Special Weather Statement | BOI | 31 min |
| Aug 29, 5:51 PM MDT | Special Weather Statement | BOI | 24 min |
| Aug 29, 8:46 PM MDT | Special Weather Statement | BOI | 14 min |
| Sep 3, 1:19 AM MDT | Flood Watch | BOI | 18 hr |
| Sep 7, 9:46 PM MDT | Special Weather Statement | BOI | 44 min |
| Sep 7, 9:48 PM MDT | Special Weather Statement | BOI | 42 min |
| Sep 7, 11:01 PM MDT | Special Weather Statement | BOI | 44 min |
| Oct 24, 2:14 PM MDT | Winter Weather Advisory | BOI | 34 hr |
| Oct 31, 8:23 PM MDT | Air Stagnation Advisory | BOI | 34 hr |
| Nov 29, 2:41 PM MST | Winter Storm Watch | BOI | 43 hr |
| Nov 29, 2:41 PM MST | Winter Weather Advisory | BOI | 68 hr |
| Dec 1, 9:51 AM MST | Winter Storm Warning | BOI | 55 hr |
| Dec 11, 1:56 PM MST | Air Stagnation Advisory | BOI | 7 days |
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 | 3 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 18 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 1 |
| Flood Watch | 4 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 10 |
| River Flood Advisory | 1 |
| Winter | |
| Snow Squall Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 3 |
| Wind and dust | |
| Dust Storm Advisory | 1 |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Air Stagnation Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.