Alert archive / Idaho / Twin Falls County
Weather alerts in Twin Falls County, Idaho, 2021
106 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Twin Falls County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 106
- Warnings
- 36
- Watches
- 15
- Advisories
- 32
- Busiest month
- June25 alerts
- Busiest day
- August 1, 20216 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Twin Falls County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 1 | 0% | |||
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: severe thunderstorm warnings | 15 | 3 | 80% | 41 | 17% | 23 min |
| NWS Boise, ID: flash flood warnings | 10 | 2 | 80% | 4 | 100% | 77 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 22, 2:24 AM MST | Winter Weather Advisory | BOI | 32 hr |
| Jan 23, 12:32 AM MST | Dense Fog Advisory | BOI | 13 hr |
| Jan 27, 5:02 AM MST | Wind Advisory | BOI | 12 hr |
| Jan 27, 10:39 AM MST | High Wind Warning | BOI | 8 hr |
| Feb 4, 2:33 PM MST | Wind Advisory | BOI | 26 hr |
| Feb 10, 1:26 PM MST | Winter Weather Advisory | BOI | 70 hr |
| Feb 13, 10:59 AM MST | Winter Weather Advisory | BOI | 6 hr |
| Feb 13, 2:09 PM MST | Winter Weather Advisory | BOI | 63 hr |
| Feb 17, 2:25 AM MST | Winter Weather Advisory | BOI | 57 hr |
| Feb 24, 12:30 PM MST | Winter Weather Advisory | BOI | 3 days |
| Mar 27, 2:18 PM MDT | Wind Advisory | BOI | 12 hr |
| Mar 28, 2:44 AM MDT | High Wind Warning | BOI | 33 hr |
| Mar 29, 8:26 AM MDT | Wind Advisory | BOI | 8 hr |
| Apr 7, 11:35 AM MDT | Wind Advisory | BOI | 32 hr |
| Apr 9, 1:49 PM MDT | Wind Advisory | BOI | 31 hr |
| Apr 12, 2:05 AM MDT | Wind Advisory | BOI | 45 hr |
| Apr 13, 1:10 PM MDT | Winter Weather Advisory | BOI | 23 hr |
| Apr 19, 2:34 AM MDT | Wind Advisory | BOI | 15 hr |
| May 1, 4:28 PM MDT | Special Weather Statement | BOI | 47 min |
| May 1, 4:29 PM MDT | Special Weather Statement | BOI | 46 min |
| May 14, 4:15 PM MDT | Special Weather Statement | PIH | 60 min |
| May 21, 4:26 PM MDT | Special Weather Statement | PIH | 34 min |
| May 31, 2:13 PM MDT | Excessive Heat Watch | BOI | 24 hr |
| Jun 1, 2:10 PM MDT | Heat Advisory | BOI | 55 hr |
| Jun 4, 7:14 PM MDT | Special Weather Statement | BOI | 31 min |
| Jun 4, 7:16 PM MDT | Special Weather Statement | LKN | 14 min |
| Jun 4, 8:24 PM MDT | Special Weather Statement | LKN | 36 min |
| Jun 4, 8:56 PM MDT | Special Weather Statement | LKN | 34 min |
| Jun 4, 8:58 PM MDT | Special Weather Statement | BOI | 47 min |
| Jun 9, 3:27 AM MDT | Red Flag Warning | PIH | 18 hr |
| Jun 13, 2:38 AM MDT | Heat Advisory | BOI | 18 hr |
| Jun 15, 9:29 AM MDT | Red Flag Warning | PIH | 12 hr |
| Jun 17, 1:18 PM MDT | Fire Weather Watch | PIH | 24 hr |
| Jun 18, 7:57 AM MDT | Fire Weather Watch | BOI | 24 hr |
| Jun 18, 1:41 PM MDT | Red Flag Warning | PIH | 32 hr |
| Jun 20, 2:31 AM MDT | Red Flag Warning | PIH | 16 hr |
| Jun 22, 10:19 AM MDT | High Wind Watch | BOI | 10 hr |
| Jun 22, 1:10 PM MDT | Fire Weather Watch | BOI | 19 hr |
| Jun 22, 2:44 PM MDT | Fire Weather Watch | PIH | 11 hr |
| Jun 22, 8:36 PM MDT | High Wind Warning | BOI | 3 hr |
| Jun 23, 1:49 AM MDT | Red Flag Warning | PIH | 17 hr |
| Jun 23, 8:07 AM MDT | Red Flag Warning | BOI | 14 hr |
| Jun 23, 2:33 PM MDT | Excessive Heat Watch | BOI | 24 hr |
| Jun 23, 7:13 PM MDT | Red Flag Warning | PIH | 26 hr |
| Jun 24, 2:09 PM MDT | Excessive Heat Warning | BOI | 13 days |
| Jun 30, 3:03 AM MDT | Heat Advisory | BOI | 6 days |
| Jun 30, 2:07 PM MDT | Red Flag Warning | BOI | 33 hr |
| Jun 30, 2:12 PM MDT | Red Flag Warning | PIH | 31 hr |
| Jul 2, 3:14 AM MDT | Red Flag Warning | PIH | 17 hr |
| Jul 2, 1:33 PM MDT | Red Flag Warning | BOI | 33 hr |
| Jul 4, 2:56 AM MDT | Red Flag Warning | PIH | 23 hr |
| Jul 4, 8:10 AM MDT | Red Flag Warning | BOI | 15 hr |
| Jul 6, 2:28 AM MDT | Fire Weather Watch | PIH | 35 hr |
| Jul 7, 1:18 PM MDT | Red Flag Warning | PIH | 32 hr |
| Jul 8, 2:58 AM MDT | Excessive Heat Watch | BOI | 12 hr |
| Jul 8, 2:59 AM MDT | Red Flag Warning | PIH | 42 hr |
| Jul 8, 2:37 PM MDT | Excessive Heat Warning | BOI | 4 days |
| Jul 12, 1:39 PM MDT | Fire Weather Watch | PIH | 11 hr |
| Jul 13, 1:05 AM MDT | Red Flag Warning | PIH | 21 hr |
| Jul 17, 3:40 AM MDT | Heat Advisory | BOI | 41 hr |
| Jul 17, 2:42 PM MDT | Fire Weather Watch | BOI | 24 hr |
| Jul 18, 2:17 AM MDT | Fire Weather Watch | PIH | 24 hr |
| Jul 18, 2:23 PM MDT | Red Flag Warning | BOI | 57 hr |
| Jul 19, 1:53 AM MDT | Red Flag Warning | PIH | 43 hr |
| Jul 22, 2:00 AM MDT | Red Flag Warning | PIH | 19 hr |
| Jul 23, 2:18 PM MDT | Excessive Heat Watch | BOI | 12 hr |
| Jul 24, 2:02 AM MDT | Excessive Heat Warning | BOI | 70 hr |
| Jul 29, 2:20 PM MDT | Flash Flood Watch | BOI | 3 days |
| Jul 30, 3:12 PM MDT | Special Weather Statement | LKN | 48 min |
| Jul 31, 5:40 PM MDT | Special Weather Statement | LKN | 50 min |
| Jul 31, 6:40 PM MDT | Special Weather Statement | BOI | 35 min |
| Jul 31, 7:06 PM MDT | Flash Flood Warning | BOI | 3 hr |
| Jul 31, 7:39 PM MDT | Flash Flood Warning | BOI | 3 hr |
| Aug 1, 1:11 PM MDT | Special Weather Statement | BOI | 49 min |
| Aug 1, 1:25 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Aug 1, 3:21 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Aug 1, 6:36 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Aug 4, 2:34 PM MDT | Red Flag Warning | BOI | 42 hr |
| Aug 5, 2:41 AM MDT | Wind Advisory | BOI | 27 hr |
| Aug 5, 2:45 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 6:03 PM MDT | Special Weather Statement | PIH | 27 min |
| Aug 12, 2:04 PM MDT | Excessive Heat Warning | BOI | 23 hr |
| Aug 16, 9:24 PM MDT | Special Weather Statement | BOI | 36 min |
| Aug 19, 2:41 PM MDT | Fire Weather Watch | BOI | 18 hr |
| Aug 20, 8:25 AM MDT | Red Flag Warning | BOI | 40 hr |
| Aug 20, 9:50 AM MDT | Red Flag Warning | PIH | 37 hr |
| Aug 21, 9:06 PM MDT | Special Weather Statement | BOI | 39 min |
| Sep 10, 2:47 AM MDT | Red Flag Warning | PIH | 19 hr |
| Sep 10, 1:02 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Sep 10, 3:27 PM MDT | Special Weather Statement | BOI | 63 min |
| Sep 10, 4:32 PM MDT | Special Weather Statement | BOI | 58 min |
| Sep 12, 8:47 PM MDT | Special Weather Statement | BOI | 28 min |
| Sep 16, 1:24 PM MDT | Red Flag Warning | BOI | 56 hr |
| Sep 16, 1:35 PM MDT | Red Flag Warning | PIH | 55 hr |
| Sep 27, 2:01 PM MDT | Wind Advisory | BOI | 20 hr |
| Oct 7, 2:15 PM MDT | Special Weather Statement | BOI | 45 min |
| Oct 7, 4:07 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Oct 10, 2:34 PM MDT | Freeze Warning | BOI | 44 hr |
| Oct 23, 2:42 AM MDT | Wind Advisory | BOI | 42 hr |
| Nov 14, 2:10 PM MST | Wind Advisory | BOI | 45 hr |
| Dec 12, 2:29 PM MST | Wind Advisory | BOI | 45 hr |
| Dec 14, 2:37 PM MST | Winter Weather Advisory | BOI | 41 hr |
| Dec 21, 2:24 PM MST | Winter Weather Advisory | BOI | 6 days |
| Dec 22, 1:48 PM MST | Winter Storm Warning | BOI | 5 days |
| Dec 23, 3:02 AM MST | Wind Advisory | BOI | 14 hr |
| Dec 29, 8:05 PM MST | Winter Weather Advisory | BOI | 48 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 10 |
| Heat | |
| Excessive Heat Warning | 4 |
| Excessive Heat Watch | 4 |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 1 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 14 |
| Fire | |
| Red Flag Warning | 25 |
| Fire Weather Watch | 9 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.