Alert archive / Idaho / Gem County
Weather alerts in Gem County, Idaho, 2025
84 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Gem County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 84
- Warnings
- 7
- Watches
- 14
- Advisories
- 40
- Busiest month
- July14 alerts
- Busiest day
- July 4, 20253 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Gem County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 1 | 50% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: severe thunderstorm warnings | 39 | 5 | 87% | 62 | 19% | 24 min |
| NWS Boise, ID: flash flood warnings | 11 | 4 | 64% | 20 | 30% | 30 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 6, 6:55 AM MST | Dense Fog Advisory | BOI | 4 hr |
| Jan 6, 12:58 PM MST | Air Stagnation Advisory | BOI | 4 days |
| Jan 11, 3:10 AM MST | Dense Fog Advisory | BOI | 8 hr |
| Jan 13, 1:24 PM MST | Air Stagnation Advisory | BOI | 4 days |
| Jan 25, 10:27 AM MST | Air Stagnation Advisory | BOI | 6 days |
| Jan 29, 1:00 PM MST | Winter Storm Watch | BOI | 24 hr |
| Jan 30, 1:22 PM MST | Winter Weather Advisory | BOI | 48 hr |
| Feb 1, 1:47 PM MST | Winter Storm Warning | BOI | 51 hr |
| Feb 1, 1:47 PM MST | Winter Weather Advisory | BOI | 4 days |
| Feb 6, 2:53 AM MST | Winter Weather Advisory | BOI | 35 hr |
| Feb 8, 2:07 PM MST | Cold Weather Advisory | BOI | 5 days |
| Feb 11, 1:37 PM MST | Winter Storm Watch | BOI | 14 hr |
| Feb 12, 4:04 AM MST | Winter Storm Warning | BOI | 55 hr |
| Feb 12, 4:04 AM MST | Winter Weather Advisory | BOI | 55 hr |
| Feb 15, 1:36 PM MST | Winter Weather Advisory | BOI | 24 hr |
| Feb 17, 10:46 PM MST | Dense Fog Advisory | BOI | 14 hr |
| Feb 19, 8:40 AM MST | Winter Weather Advisory | BOI | 5 hr |
| Mar 5, 1:09 PM MST | Wind Advisory | BOI | 34 hr |
| Mar 15, 3:09 AM MDT | Winter Weather Advisory | BOI | 33 hr |
| Mar 16, 5:46 PM MDT | Winter Weather Advisory | BOI | 12 hr |
| Mar 21, 1:36 PM MDT | Winter Weather Advisory | BOI | 14 hr |
| Apr 16, 12:40 PM MDT | Wind Advisory | BOI | 32 hr |
| Apr 26, 5:28 PM MDT | Special Weather Statement | BOI | 32 min |
| May 29, 12:39 PM MDT | Heat Advisory | BOI | 54 hr |
| Jun 8, 1:59 AM MDT | Heat Advisory | BOI | 68 hr |
| Jun 10, 11:38 AM MDT | Flood Watch | BOI | 28 hr |
| Jun 10, 8:26 PM MDT | Special Weather Statement | BOI | 49 min |
| Jun 11, 12:28 PM MDT | Special Weather Statement | BOI | 32 min |
| Jun 28, 2:03 PM MDT | Heat Advisory | BOI | 3 days |
| Jul 2, 7:34 PM MDT | Special Weather Statement | BOI | 41 min |
| Jul 3, 4:49 PM MDT | Flash Flood Watch | BOI | 28 hr |
| Jul 3, 9:10 PM MDT | Special Weather Statement | BOI | 50 min |
| Jul 3, 9:43 PM MDT | Special Weather Statement | BOI | 62 min |
| Jul 4, 12:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 7, 1:23 PM MDT | Heat Advisory | BOI | 32 hr |
| Jul 8, 12:49 PM MDT | Red Flag Warning | BOI | 34 hr |
| Jul 9, 8:52 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Jul 12, 2:40 AM MDT | Heat Advisory | BOI | 66 hr |
| Jul 26, 7:10 PM MDT | Special Weather Statement | BOI | 50 min |
| Jul 26, 7:48 PM MDT | Special Weather Statement | BOI | 57 min |
| Jul 30, 2:26 PM MDT | Red Flag Warning | BOI | 34 hr |
| Jul 31, 9:38 AM MDT | Flash Flood Watch | BOI | 12 hr |
| Jul 31, 2:34 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Aug 3, 8:34 PM MDT | Special Weather Statement | BOI | 41 min |
| Aug 3, 9:13 PM MDT | Special Weather Statement | BOI | 47 min |
| Aug 3, 9:49 PM MDT | Special Weather Statement | BOI | 41 min |
| Aug 4, 6:04 PM MDT | Special Weather Statement | BOI | 41 min |
| Aug 4, 6:21 PM MDT | Special Weather Statement | BOI | 24 min |
| Aug 4, 6:27 PM MDT | Special Weather Statement | BOI | 48 min |
| Aug 11, 12:35 AM MDT | Extreme Heat Watch | BOI | 13 hr |
| Aug 11, 1:05 PM MDT | Heat Advisory | BOI | 56 hr |
| Aug 15, 1:52 PM MDT | Flash Flood Watch | BOI | 34 hr |
| Aug 17, 2:41 AM MDT | Flash Flood Watch | BOI | 24 hr |
| Aug 25, 11:41 AM MDT | Flash Flood Watch | BOI | 58 hr |
| Sep 10, 7:41 PM MDT | Special Weather Statement | BOI | 49 min |
| Sep 11, 12:59 PM MDT | Flash Flood Watch | BOI | 8 hr |
| Sep 11, 4:09 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Sep 14, 2:10 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 6:26 PM MDT | Special Weather Statement | BOI | 49 min |
| Sep 29, 8:51 PM MDT | Special Weather Statement | BOI | 69 min |
| Sep 30, 11:43 AM MDT | Special Weather Statement | BOI | 47 min |
| Oct 1, 2:44 PM MDT | Flash Flood Watch | BOI | 43 hr |
| Oct 6, 1:20 PM MDT | Frost Advisory | BOI | 20 hr |
| Oct 10, 4:43 PM MDT | Special Weather Statement | BOI | 32 min |
| Oct 16, 2:05 PM MDT | Frost Advisory | BOI | 43 hr |
| Oct 20, 2:28 AM MDT | Freeze Watch | BOI | 11 hr |
| Oct 20, 1:06 PM MDT | Freeze Warning | BOI | 21 hr |
| Oct 25, 5:38 PM MDT | Special Weather Statement | BOI | 52 min |
| Nov 18, 1:26 AM MST | Dense Fog Advisory | BOI | 9 hr |
| Nov 20, 10:00 PM MST | Dense Fog Advisory | BOI | 12 hr |
| Nov 21, 1:07 PM MST | Dense Fog Advisory | BOI | 21 hr |
| Nov 23, 1:14 AM MST | Dense Fog Advisory | BOI | 9 hr |
| Nov 27, 3:13 AM MST | Dense Fog Advisory | BOI | 8 hr |
| Nov 27, 10:05 PM MST | Dense Fog Advisory | BOI | 11 hr |
| Dec 4, 1:41 PM MST | Winter Weather Advisory | BOI | 33 hr |
| Dec 10, 1:30 PM MST | Air Stagnation Advisory | BOI | 6 days |
| Dec 14, 5:16 AM MST | Dense Fog Advisory | BOI | 6 hr |
| Dec 15, 1:52 PM MST | High Wind Watch | BOI | 7 hr |
| Dec 15, 8:23 PM MST | Wind Advisory | BOI | 45 hr |
| Dec 16, 12:48 PM MST | Winter Storm Watch | BOI | 24 hr |
| Dec 17, 7:28 AM MST | Severe Thunderstorm Warning | BOI | 47 min |
| Dec 17, 8:09 AM MST | Severe Thunderstorm Warning | BOI | 21 min |
| Dec 25, 1:42 AM MST | Winter Weather Advisory | BOI | 51 hr |
| Dec 27, 12:56 PM MST | Air Stagnation Advisory | BOI | 4 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 | 2 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Watch | 7 |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 11 |
| Heat | |
| Extreme Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Cold Weather Advisory | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Air Stagnation Advisory | 5 |
| Dense Fog Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.