Alert archive / Idaho / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Idaho, 2009
130 severe thunderstorm warnings in 2009. 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 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 130
- Busiest month
- August44 severe thunderstorm warnings
- Busiest day
- August 6, 200932 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.
22 of 130 severe thunderstorm warnings covering Idaho in 2009 had a qualifying storm report inside them; 31 of 70 hail, wind and damage reports fell inside a warning, on average 25 minutes after it went out.
Idaho, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 130 | 22 | 83% | 70 | 44% | 25 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Missoula, MT: severe thunderstorm warnings | 30 | 13 | 57% | 35 | 80% | 22 min |
| NWS Pocatello, ID: severe thunderstorm warnings | 88 | 12 | 86% | 45 | 38% | 26 min |
| NWS Spokane, WA: severe thunderstorm warnings | 27 | 11 | 59% | 27 | 74% | 17 min |
| NWS Boise, ID: severe thunderstorm warnings | 36 | 3 | 92% | 10 | 30% | 16 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 |
|---|---|---|---|---|
| Apr 13, 8:31 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Madison, Teton | 29 min |
| Apr 21, 8:26 PM MDT | Severe Thunderstorm Warning | BOI | Adams | 49 min |
| Apr 22, 7:41 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Butte, Custer | 49 min |
| Apr 22, 8:11 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 34 min |
| Apr 22, 8:44 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 46 min |
| Apr 22, 9:28 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Clark, Jefferson | 32 min |
| Apr 22, 9:53 PM MDT | Severe Thunderstorm Warning | PIH | Clark, Jefferson | 22 min |
| May 3, 12:00 PM MDT | Severe Thunderstorm Warning | BOI | Gem, Payette | 45 min |
| May 3, 1:40 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Elmore | 35 min |
| May 3, 2:18 PM MDT | Severe Thunderstorm Warning | PIH | Power | 26 min |
| May 3, 2:27 PM MDT | Severe Thunderstorm Warning | BOI | Gem, Payette, Washington | 48 min |
| May 3, 3:37 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Minidoka | 34 min |
| May 18, 8:43 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 22 min |
| May 18, 9:53 PM MDT | Severe Thunderstorm Warning | OTX | Nez Perce | 37 min |
| May 18, 10:11 PM MDT | Severe Thunderstorm Warning | OTX | Latah | 34 min |
| May 18, 10:17 PM MDT | Severe Thunderstorm Warning | OTX | Latah, Nez Perce | 32 min |
| May 18, 10:48 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater | 27 min |
| May 30, 4:44 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 29 min |
| May 31, 2:35 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Butte | 40 min |
| May 31, 8:23 PM MDT | Severe Thunderstorm Warning | PIH | Fremont | 37 min |
| Jun 2, 3:54 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Oneida, Power | 41 min |
| Jun 2, 7:10 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida | 43 min |
| Jun 3, 5:54 PM MDT | Severe Thunderstorm Warning | PIH | Caribou | 36 min |
| Jun 3, 6:19 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Butte | 41 min |
| Jun 3, 6:29 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 46 min |
| Jun 3, 6:57 PM MDT | Severe Thunderstorm Warning | PIH | Bingham | 48 min |
| Jun 3, 7:44 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham | 46 min |
| Jun 3, 7:54 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Caribou | 51 min |
| Jun 4, 6:37 PM MDT | Severe Thunderstorm Warning | BOI | Washington | 25 min |
| Jun 5, 4:31 PM MDT | Severe Thunderstorm Warning | PIH | Lincoln | 33 min |
| Jun 5, 5:54 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 36 min |
| Jun 5, 7:25 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Jefferson, Madison | 50 min |
| Jun 5, 7:31 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 59 min |
| Jun 5, 7:49 PM MDT | Severe Thunderstorm Warning | PIH | Jefferson, Madison | 28 min |
| Jun 5, 8:07 PM MDT | Severe Thunderstorm Warning | PIH | Fremont, Madison | 38 min |
| Jun 5, 8:14 PM MDT | Severe Thunderstorm Warning | PIH | Clark, Fremont, Jefferson | 31 min |
| Jun 14, 1:57 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Jefferson | 33 min |
| Jun 17, 2:39 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Butte, Jefferson | 36 min |
| Jun 21, 1:58 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Cassia, Power | 32 min |
| Jun 21, 2:24 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Blaine, Cassia, Power | 36 min |
| Jun 21, 2:53 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Power | 37 min |
| Jun 21, 3:31 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Bonneville, Caribou, Power | 44 min |
| Jun 21, 4:14 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Jefferson | 39 min |
| Jun 26, 1:32 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Caribou | 28 min |
| Jun 26, 3:06 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Jefferson | 39 min |
| Jun 26, 3:45 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Jefferson | 45 min |
| Jun 26, 4:22 PM MDT | Severe Thunderstorm Warning | PIH | Butte | 19 min |
| Jun 26, 4:28 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 47 min |
| Jun 26, 4:46 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bear Lake, Caribou | 24 min |
| Jun 26, 5:09 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 33 min |
| Jun 30, 4:33 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Teton | 25 min |
| Jun 30, 4:51 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Caribou | 39 min |
| Jun 30, 5:49 PM MDT | Severe Thunderstorm Warning | PIH | Cassia | 34 min |
| Jul 1, 7:38 PM MDT | Severe Thunderstorm Warning | PIH | Oneida | 35 min |
| Jul 2, 6:03 PM MDT | Severe Thunderstorm Warning | PIH | Lincoln | 27 min |
| Jul 3, 2:47 PM MDT | Severe Thunderstorm Warning | PIH | Butte | 41 min |
| Jul 3, 4:07 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Jefferson | 53 min |
| Jul 3, 5:16 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 59 min |
| Jul 3, 5:45 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Caribou | 26 min |
| Jul 3, 6:15 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville | 15 min |
| Jul 3, 6:36 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake, Caribou | 40 min |
| Jul 4, 2:57 PM MDT | Severe Thunderstorm Warning | PIH | Power | 20 min |
| Jul 4, 3:36 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Caribou | 39 min |
| Jul 4, 4:49 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida | 26 min |
| Jul 4, 5:36 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Blaine, Power | 54 min |
| Jul 4, 7:21 PM MDT | Severe Thunderstorm Warning | PIH | Bannock | 34 min |
| Jul 5, 4:09 PM MDT | Severe Thunderstorm Warning | BOI | Gooding, Twin Falls | 30 min |
| Jul 5, 4:11 PM MDT | Severe Thunderstorm Warning | BOI | Owyhee | 22 min |
| Jul 5, 4:24 PM MDT | Severe Thunderstorm Warning | BOI | Jerome, Twin Falls | 51 min |
| Jul 5, 6:32 PM MDT | Severe Thunderstorm Warning | OTX | Latah | 43 min |
| Jul 12, 3:47 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 43 min |
| Jul 12, 9:23 PM MDT | Severe Thunderstorm Warning | OTX | Nez Perce | 45 min |
| Jul 23, 4:45 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 45 min |
| Jul 23, 5:11 PM MDT | Severe Thunderstorm Warning | PIH | Cassia, Oneida, Power | 17 min |
| Jul 25, 7:03 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 42 min |
| Jul 26, 2:46 PM MDT | Severe Thunderstorm Warning | PIH | Custer | 48 min |
| Jul 26, 3:06 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Clark, Custer | 39 min |
| Jul 26, 3:21 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 39 min |
| Jul 26, 3:43 PM MDT | Severe Thunderstorm Warning | PIH | Caribou | 39 min |
| Jul 28, 4:22 PM MDT | Severe Thunderstorm Warning | OTX | Bonner | 53 min |
| Jul 28, 5:10 PM MDT | Severe Thunderstorm Warning | OTX | Bonner, Kootenai | 25 min |
| Aug 3, 4:47 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Power | 37 min |
| Aug 3, 5:15 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Caribou | 57 min |
| Aug 3, 5:54 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Butte, Fremont, Jefferson, Madison | 27 min |
| Aug 3, 7:41 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Canyon, Owyhee | 34 min |
| Aug 5, 7:10 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Butte, Custer, Lincoln | 58 min |
| Aug 5, 10:36 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 24 min |
| Aug 6, 7:22 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore, Owyhee | 38 min |
| Aug 6, 7:47 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise | 28 min |
| Aug 6, 7:52 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Elmore | 38 min |
| Aug 6, 8:24 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Elmore | 51 min |
| Aug 6, 9:07 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Canyon, Gem, Owyhee | 48 min |
| Aug 6, 9:51 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore, Owyhee | 54 min |
| Aug 6, 10:40 AM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Elmore | 35 min |
| Aug 6, 11:07 AM MDT | Severe Thunderstorm Warning | BOI | Boise, Elmore | 38 min |
| Aug 6, 11:35 AM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 40 min |
| Aug 6, 11:38 AM MDT | Severe Thunderstorm Warning | BOI | Boise, Elmore | 37 min |
| Aug 6, 12:04 PM MDT | Severe Thunderstorm Warning | PIH | Custer | 56 min |
| Aug 6, 12:15 PM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 45 min |
| Aug 6, 1:03 PM MDT | Severe Thunderstorm Warning | PIH | Custer | 42 min |
| Aug 6, 1:23 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Boise, Elmore, Owyhee | 25 min |
| Aug 6, 1:52 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 38 min |
| Aug 6, 1:53 PM MDT | Severe Thunderstorm Warning | BOI | Ada, Elmore, Owyhee | 19 min |
| Aug 6, 1:59 PM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 61 min |
| Aug 6, 2:18 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Bonneville, Caribou | 42 min |
| Aug 6, 2:29 PM MDT | Severe Thunderstorm Warning | PIH | Fremont, Madison | 46 min |
| Aug 6, 2:41 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Madison, Teton | 49 min |
| Aug 6, 2:49 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Caribou | 41 min |
| Aug 6, 2:58 PM MDT | Severe Thunderstorm Warning | PIH | Fremont, Madison, Teton | 47 min |
| Aug 6, 3:19 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Blaine, Butte, Cassia, Minidoka and 2 more | 41 min |
| Aug 6, 3:33 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Teton | 29 min |
| Aug 6, 3:44 PM MDT | Severe Thunderstorm Warning | PIH | Clark, Fremont, Jefferson | 39 min |
| Aug 6, 4:16 PM MDT | Severe Thunderstorm Warning | PIH | Custer | 29 min |
| Aug 6, 4:41 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Butte, Clark, Jefferson | 49 min |
| Aug 6, 4:51 PM MDT | Severe Thunderstorm Warning | PIH | Custer | 24 min |
| Aug 6, 5:03 PM MDT | Severe Thunderstorm Warning | PIH | Clark | 27 min |
| Aug 6, 5:20 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Clark, Jefferson | 25 min |
| Aug 6, 6:16 PM MDT | Severe Thunderstorm Warning | BOI | Camas, Gooding | 27 min |
| Aug 13, 2:54 PM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 21 min |
| Aug 14, 3:40 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Caribou | 35 min |
| Aug 29, 7:48 PM MDT | Severe Thunderstorm Warning | BOI | Boise, Gem, Payette, Valley, Washington | 42 min |
| Aug 29, 8:00 PM MDT | Severe Thunderstorm Warning | BOI | Canyon, Gem, Payette | 14 min |
| Aug 29, 8:42 PM MDT | Severe Thunderstorm Warning | BOI | Boise, Elmore | 34 min |
| Aug 30, 12:03 PM MDT | Severe Thunderstorm Warning | BOI | Camas | 42 min |
| Aug 30, 12:29 PM MDT | Severe Thunderstorm Warning | PIH | Blaine, Custer | 46 min |
| Sep 6, 7:02 PM MDT | Severe Thunderstorm Warning | OTX | Bonner, Boundary | 35 min |
| Sep 13, 7:32 PM MDT | Severe Thunderstorm Warning | PIH | Bannock | 43 min |
| Sep 14, 3:59 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Butte, Clark, Fremont, Jefferson, Madison and 1 more | 46 min |
| Sep 14, 4:32 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Clark, Fremont, Jefferson, Madison | 43 min |
| Sep 19, 4:54 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Caribou, Franklin | 25 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Bonneville County28
- Bingham County27
- Butte County18
- Jefferson County17
- Caribou County15
- Bannock County14
- Custer County12
- Power County12
- Ada County11
- Boise County11
- Elmore County11
- Madison County10
- Clark County10
- Cassia County9
- Fremont County9
- Blaine County8
- Oneida County7
- Owyhee County7
- Teton County6
- Gem County5
- Payette County4
- Clearwater County4
- Idaho County4
- Lemhi County4
- Washington County3
- Nez Perce County3
- Latah County3
- Lincoln County3
- Bonner County3
- Canyon County3
- Minidoka County2
- Bear Lake County2
- Gooding County2
- Twin Falls County2
- Camas County2
- Adams County1
- Jerome County1
- Kootenai County1
- Valley County1
- Boundary County1
1 more counties
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.