Alert archive / Idaho / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Idaho, 2020
91 severe thunderstorm warnings in 2020. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 91
- Busiest month
- August23 severe thunderstorm warnings
- Busiest day
- April 30, 202017 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
26 of 91 severe thunderstorm warnings covering Idaho in 2020 had a qualifying storm report inside them; 79 of 204 hail, wind and damage reports fell inside a warning, on average 20 minutes after it went out.
Idaho, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 91 | 26 | 71% | 204 | 39% | 20 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pocatello, ID: severe thunderstorm warnings | 52 | 19 | 63% | 158 | 41% | 21 min |
| NWS Missoula, MT: severe thunderstorm warnings | 7 | 5 | 29% | 29 | 69% | 12 min |
| NWS Boise, ID: severe thunderstorm warnings | 47 | 6 | 87% | 40 | 30% | 20 min |
| NWS Spokane, WA: severe thunderstorm warnings | 20 | 13 | 35% | 49 | 47% | 15 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 | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 5:50 PM MDT | Severe Thunderstorm Warning | BOI | Canyon, Gem, Payette | 25 min |
| Mar 24, 6:08 PM MDT | Severe Thunderstorm Warning | BOI | Canyon, Gem, Payette | 14 min |
| Mar 30, 12:54 PM MDT | Severe Thunderstorm Warning | OTX | Bonner | 36 min |
| Apr 30, 1:22 PM MDT | Severe Thunderstorm Warning | PIH | Cassia | 53 min |
| Apr 30, 1:39 PM MDT | Severe Thunderstorm Warning | BOI | Canyon, Owyhee | 51 min |
| Apr 30, 2:13 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Canyon, Elmore, Owyhee | 47 min |
| Apr 30, 2:28 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Canyon, Elmore, Gem | 47 min |
| Apr 30, 2:33 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore, Owyhee | 42 min |
| Apr 30, 2:48 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore | 42 min |
| Apr 30, 3:12 PM MDT | Severe Thunderstorm Warning | BOI | Boise, Camas, Elmore, Gooding, Owyhee, Twin Falls | 48 min |
| Apr 30, 3:44 PM MDT | Severe Thunderstorm Warning | PIH | Franklin, Oneida | 46 min |
| Apr 30, 3:57 PM MDT | Severe Thunderstorm Warning | PIH | Lincoln | 48 min |
| Apr 30, 4:29 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Lincoln | 46 min |
| Apr 30, 4:39 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Lincoln, Minidoka, Power | 51 min |
| Apr 30, 4:47 PM MDT | Severe Thunderstorm Warning | PIH | Clark | 28 min |
| Apr 30, 5:17 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Blaine, Power | 43 min |
| Apr 30, 5:17 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Cassia, Minidoka, Power | 43 min |
| Apr 30, 5:46 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Butte, Clark, Custer, Jefferson | 44 min |
| Apr 30, 5:55 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 50 min |
| Apr 30, 5:59 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Blaine, Cassia, Power | 46 min |
| May 17, 4:21 PM MDT | Severe Thunderstorm Warning | OTX | Benewah, Latah | 39 min |
| May 29, 3:14 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Power | 46 min |
| May 29, 4:31 PM MDT | Severe Thunderstorm Warning | PIH | Oneida, Power | 21 min |
| May 30, 4:24 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake | 51 min |
| May 30, 5:12 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake | 48 min |
| May 30, 5:49 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Lincoln, Minidoka | 26 min |
| May 30, 5:56 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake | 24 min |
| May 30, 6:46 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 29 min |
| May 30, 7:36 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Power | 28 min |
| May 30, 7:38 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Power | 28 min |
| May 30, 9:04 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Butte, Clark, Fremont, Jefferson, Madison | 41 min |
| May 30, 9:10 PM MDT | Severe Thunderstorm Warning | OTX | Bonner | 50 min |
| Jun 6, 2:56 PM MDT | Severe Thunderstorm Warning | PIH | Cassia | 49 min |
| Jun 6, 3:37 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 38 min |
| Jun 6, 4:03 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Franklin, Oneida | 42 min |
| Jun 6, 4:14 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 46 min |
| Jun 12, 8:14 PM MDT | Severe Thunderstorm Warning | OTX | Latah, Nez Perce | 46 min |
| Jun 12, 8:20 PM MDT | Severe Thunderstorm Warning | OTX | Nez Perce | 25 min |
| Jun 24, 4:21 PM MDT | Severe Thunderstorm Warning | BOI | Washington | 39 min |
| Jun 24, 4:57 PM MDT | Severe Thunderstorm Warning | BOI | Payette, Washington | 18 min |
| Jun 24, 5:08 PM MDT | Severe Thunderstorm Warning | OTX | Boundary | 52 min |
| Jun 24, 5:24 PM MDT | Severe Thunderstorm Warning | OTX | Bonner | 51 min |
| Jun 25, 5:38 PM MDT | Severe Thunderstorm Warning | PIH | Blaine | 29 min |
| Jun 27, 6:23 PM MDT | Severe Thunderstorm Warning | BOI | Twin Falls | 37 min |
| Jun 27, 6:31 PM MDT | Severe Thunderstorm Warning | PIH | Cassia | 29 min |
| Jun 27, 7:46 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida | 44 min |
| Jun 27, 10:10 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake, Franklin, Oneida | 31 min |
| Jul 23, 3:56 PM MDT | Severe Thunderstorm Warning | BOI | Elmore, Owyhee | 32 min |
| Jul 23, 4:08 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 37 min |
| Jul 23, 4:24 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 51 min |
| Jul 23, 4:24 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 36 min |
| Jul 23, 4:39 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 51 min |
| Jul 23, 4:58 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 47 min |
| Jul 23, 5:16 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee, Twin Falls | 44 min |
| Jul 23, 5:36 PM MDT | Severe Thunderstorm Warning | PIH | Fremont, Madison, Teton | 39 min |
| Jul 23, 5:37 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Canyon, Elmore, Owyhee | 23 min |
| Jul 23, 5:53 PM MDT | Severe Thunderstorm Warning | BOI | Boise, Elmore | 37 min |
| Jul 23, 6:00 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore | 30 min |
| Jul 23, 6:25 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Butte, Custer, Lincoln, Minidoka | 50 min |
| Aug 10, 7:36 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 39 min |
| Aug 17, 6:51 PM MDT | Severe Thunderstorm Warning | BOI | Adams, Valley, Washington | 39 min |
| Aug 17, 7:07 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 53 min |
| Aug 17, 7:20 PM MDT | Severe Thunderstorm Warning | BOI | Adams, Valley | 25 min |
| Aug 17, 7:25 PM MDT | Severe Thunderstorm Warning | OTX | Lewis, Nez Perce | 6 min |
| Aug 19, 5:15 PM MDT | Severe Thunderstorm Warning | PIH | Clark | 30 min |
| Aug 25, 3:20 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Cassia, Oneida, Power | 40 min |
| Aug 25, 3:55 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Blaine, Cassia, Franklin, Oneida, Power | 50 min |
| Aug 25, 4:37 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Blaine, Bonneville, Butte, Custer and 4 more | 38 min |
| Aug 25, 4:37 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Power | 23 min |
| Aug 25, 5:09 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Blaine, Bonneville, Butte, Jefferson and 2 more | 51 min |
| Aug 25, 5:54 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Clark, Fremont, Jefferson, Madison and 1 more | 36 min |
| Aug 25, 8:50 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Power | 25 min |
| Aug 26, 4:55 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 50 min |
| Aug 26, 5:16 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 44 min |
| Aug 26, 5:27 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 25 min |
| Aug 26, 5:48 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 42 min |
| Aug 26, 6:19 PM MDT | Severe Thunderstorm Warning | BOI | Elmore, Owyhee | 41 min |
| Aug 26, 6:37 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Butte, Lincoln, Minidoka | 38 min |
| Aug 26, 6:49 PM MDT | Severe Thunderstorm Warning | BOI | Elmore, Gooding, Owyhee, Twin Falls | 41 min |
| Aug 26, 7:21 PM MDT | Severe Thunderstorm Warning | BOI | Elmore, Gooding, Jerome, Owyhee, Twin Falls | 39 min |
| Aug 26, 8:43 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Butte, Jefferson | 47 min |
| Aug 26, 9:26 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Jefferson | 49 min |
| Sep 19, 2:09 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 36 min |
| Sep 19, 3:22 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Jefferson | 23 min |
| Sep 19, 3:44 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Jefferson | 46 min |
| Sep 19, 4:08 PM MDT | Severe Thunderstorm Warning | PIH | Clark, Fremont, Jefferson | 23 min |
| Sep 19, 4:29 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Clark, Fremont, Jefferson, Madison | 46 min |
| Sep 19, 5:04 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Fremont, Jefferson, Madison | 41 min |
| Sep 19, 5:34 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Fremont, Jefferson, Madison, Teton | 41 min |
| Sep 19, 5:38 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Fremont, Jefferson, Madison, Teton | 37 min |
| Sep 19, 5:43 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Bonneville, Caribou | 32 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Owyhee County19
- Power County18
- Bingham County16
- Cassia County14
- Jefferson County14
- Elmore County12
- Blaine County12
- Bonneville County12
- Oneida County11
- Bannock County10
- Butte County10
- Fremont County8
- Lincoln County7
- Minidoka County7
- Clark County7
- Madison County7
- Canyon County6
- Ada County6
- Twin Falls County5
- Franklin County4
- Custer County4
- Bear Lake County4
- Teton County4
- Gem County3
- Payette County3
- Bonner County3
- Boise County3
- Gooding County3
- Nez Perce County3
- Washington County3
- Latah County2
- Adams County2
- Valley County2
- Camas County1
- Benewah County1
- Boundary County1
- Idaho County1
- Lewis County1
- Jerome County1
- Caribou County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.