Weather alerts in Idaho, 2022
1,436 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 1,436
- Warnings
- 298
- Watches
- 84
- Advisories
- 351
- Busiest month
- August377 alerts
- Busiest day
- August 12, 202298 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Idaho in 2022 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Idaho, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 144 | 53 | 63% | 169 | 48% | 19 min |
| Flash flood warnings | 11 | 3 | 73% | 15 | 80% | 15 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 76 | 39 | 49% | 90 | 74% | 16 min |
| NWS Missoula, MT: flash flood warnings | 0 | 3 | 0% | |||
| NWS Pocatello, ID: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Pocatello, ID: severe thunderstorm warnings | 58 | 15 | 74% | 84 | 36% | 21 min |
| NWS Pocatello, ID: flash flood warnings | 5 | 3 | 40% | 14 | 86% | 15 min |
| NWS Spokane, WA: tornado warnings | 0 | 2 | 0% | |||
| NWS Spokane, WA: severe thunderstorm warnings | 38 | 22 | 42% | 115 | 53% | 16 min |
| NWS Spokane, WA: flash flood warnings | 29 | 9 | 69% | 42 | 60% | 22 min |
| NWS Boise, ID: tornado warnings | 0 | 1 | 0% | |||
| NWS Boise, ID: severe thunderstorm warnings | 61 | 15 | 75% | 40 | 63% | 23 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
1,436 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Power County217
- Bingham County207
- Bonneville County177
- Bannock County166
- Fremont County160
- Butte County159
- Blaine County145
- Madison County144
- Idaho County140
- Teton County129
- Clark County128
- Jefferson County127
- Cassia County126
- Kootenai County123
- Owyhee County117
- Caribou County116
- Oneida County107
- Elmore County107
- Minidoka County101
- Bear Lake County100
- Custer County100
- Clearwater County95
- Twin Falls County93
- Franklin County91
- Latah County90
- Benewah County89
- Bonner County87
- Lemhi County86
- Washington County85
- Shoshone County84
- Nez Perce County80
- Lincoln County79
- Gem County76
- Lewis County75
- Ada County74
- Boise County73
- Valley County73
- Boundary County73
- Jerome County69
- Adams County66
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20212023
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.