Alert archive / Idaho / Twin Falls County
Weather alerts in Twin Falls County, Idaho, 2020
86 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 86
- Warnings
- 29
- Watches
- 13
- Advisories
- 24
- Busiest month
- August23 alerts
- Busiest day
- August 25, 20204 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, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 1 | 80% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: severe thunderstorm warnings | 47 | 6 | 87% | 40 | 30% | 20 min |
| NWS Boise, ID: flash flood warnings | 0 | 1 | 0% |
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 1, 3:10 AM MST | Wind Advisory | BOI | 14 hr |
| Jan 8, 2:44 PM MST | Winter Storm Watch | BOI | 37 hr |
| Jan 10, 3:29 AM MST | Winter Weather Advisory | BOI | 48 hr |
| Jan 10, 2:36 PM MST | Winter Storm Watch | BOI | 24 hr |
| Jan 11, 2:32 PM MST | Winter Weather Advisory | BOI | 24 hr |
| Jan 14, 5:17 PM MST | Special Weather Statement | BOI | 58 min |
| Feb 1, 2:20 AM MST | Winter Weather Advisory | BOI | 56 hr |
| Feb 2, 2:09 PM MST | Wind Advisory | BOI | 27 hr |
| Feb 7, 3:15 AM MST | Wind Advisory | BOI | 14 hr |
| Feb 23, 2:18 PM MST | Wind Advisory | BOI | 9 hr |
| Feb 23, 3:34 PM MST | High Wind Warning | BOI | 7 hr |
| Apr 9, 2:35 AM MDT | Wind Advisory | BOI | 69 hr |
| Apr 15, 2:28 PM MDT | Wind Advisory | BOI | 7 hr |
| Apr 30, 11:36 AM MDT | Mesoscale Discussion | SPC | 84 min |
| Apr 30, 2:58 PM MDT | Mesoscale Discussion | SPC | 92 min |
| Apr 30, 3:12 PM MDT | Severe Thunderstorm Warning | BOI | 48 min |
| May 5, 2:40 AM MDT | Wind Advisory | BOI | 39 hr |
| May 6, 10:38 AM MDT | Special Weather Statement | BOI | 52 min |
| May 6, 2:11 PM MDT | Frost Advisory | BOI | 12 hr |
| May 7, 2:31 AM MDT | Frost Advisory | BOI | 5 hr |
| May 19, 3:01 PM MDT | Special Weather Statement | PIH | 14 min |
| Jun 24, 2:52 PM MDT | Special Weather Statement | BOI | 38 min |
| Jun 27, 6:09 PM MDT | Special Weather Statement | LKN | 51 min |
| Jun 27, 6:23 PM MDT | Severe Thunderstorm Warning | BOI | 37 min |
| Jul 20, 1:06 PM MDT | Fire Weather Watch | BOI | 24 hr |
| Jul 20, 2:10 PM MDT | Fire Weather Watch | PIH | 23 hr |
| Jul 21, 12:48 PM MDT | Red Flag Warning | PIH | 32 hr |
| Jul 21, 1:01 PM MDT | Red Flag Warning | BOI | 56 hr |
| Jul 22, 3:04 PM MDT | Special Weather Statement | BOI | 56 min |
| Jul 23, 5:00 PM MDT | Mesoscale Discussion | SPC | 90 min |
| Jul 23, 5:16 PM MDT | Severe Thunderstorm Warning | BOI | 44 min |
| Jul 23, 5:45 PM MDT | Special Weather Statement | BOI | 45 min |
| Jul 26, 1:07 PM MDT | Fire Weather Watch | PIH | 25 hr |
| Jul 26, 1:07 PM MDT | Fire Weather Watch | PIH | 25 hr |
| Jul 26, 1:44 PM MDT | Red Flag Warning | BOI | 57 hr |
| Jul 27, 1:52 PM MDT | Red Flag Warning | PIH | 7 hr |
| Jul 27, 1:52 PM MDT | Red Flag Warning | PIH | 28 hr |
| Jul 27, 2:55 PM MDT | Special Weather Statement | BOI | 50 min |
| Jul 28, 2:38 PM MDT | Excessive Heat Warning | BOI | 3 days |
| Jul 31, 1:56 AM MDT | Heat Advisory | BOI | 66 hr |
| Aug 5, 1:14 PM MDT | Red Flag Warning | PIH | 32 hr |
| Aug 6, 12:47 PM MDT | Red Flag Warning | BOI | 17 hr |
| Aug 11, 1:10 PM MDT | Red Flag Warning | BOI | 31 hr |
| Aug 14, 9:16 AM MDT | Excessive Heat Watch | BOI | 28 hr |
| Aug 15, 1:42 PM MDT | Heat Advisory | BOI | 4 days |
| Aug 18, 3:31 PM MDT | Special Weather Statement | LKN | 29 min |
| Aug 18, 4:36 PM MDT | Special Weather Statement | LKN | 24 min |
| Aug 18, 5:25 PM MDT | Special Weather Statement | BOI | 50 min |
| Aug 25, 3:28 AM MDT | Red Flag Warning | PIH | 18 hr |
| Aug 25, 8:13 AM MDT | Red Flag Warning | BOI | 14 hr |
| Aug 25, 1:18 PM MDT | Mesoscale Discussion | SPC | 117 min |
| Aug 25, 4:17 PM MDT | Special Weather Statement | BOI | 43 min |
| Aug 25, 7:54 PM MDT | Special Weather Statement | BOI | 51 min |
| Aug 25, 8:21 PM MDT | Special Weather Statement | BOI | 39 min |
| Aug 26, 8:12 AM MDT | Red Flag Warning | BOI | 16 hr |
| Aug 26, 4:07 PM MDT | Special Weather Statement | BOI | 53 min |
| Aug 26, 6:49 PM MDT | Severe Thunderstorm Warning | BOI | 41 min |
| Aug 26, 7:04 PM MDT | Mesoscale Discussion | SPC | 116 min |
| Aug 26, 7:21 PM MDT | Severe Thunderstorm Warning | BOI | 39 min |
| Aug 27, 6:20 AM MDT | Red Flag Warning | BOI | 14 hr |
| Aug 28, 2:22 AM MDT | Fire Weather Watch | PIH | 10 hr |
| Aug 28, 12:34 PM MDT | Red Flag Warning | PIH | 56 hr |
| Aug 29, 7:57 AM MDT | Red Flag Warning | BOI | 37 hr |
| Sep 4, 1:11 AM MDT | Fire Weather Watch | PIH | 14 hr |
| Sep 4, 3:03 PM MDT | Red Flag Warning | PIH | 54 hr |
| Sep 5, 3:15 PM MDT | Fire Weather Watch | BOI | 24 hr |
| Sep 5, 6:41 PM MDT | High Wind Watch | BOI | 18 hr |
| Sep 6, 2:23 AM MDT | Red Flag Warning | PIH | 43 hr |
| Sep 6, 12:43 PM MDT | High Wind Warning | BOI | 35 hr |
| Sep 6, 3:10 PM MDT | Red Flag Warning | BOI | 30 hr |
| Sep 8, 2:20 PM MDT | Frost Advisory | BOI | 19 hr |
| Sep 15, 2:06 PM MDT | Fire Weather Watch | PIH | 24 hr |
| Sep 15, 2:45 PM MDT | Fire Weather Watch | BOI | 48 hr |
| Sep 16, 1:50 PM MDT | Red Flag Warning | PIH | 55 hr |
| Sep 16, 2:53 PM MDT | Red Flag Warning | BOI | 54 hr |
| Oct 13, 3:13 AM MDT | Frost Advisory | BOI | 54 hr |
| Oct 13, 3:13 AM MDT | Wind Advisory | BOI | 39 hr |
| Oct 15, 2:16 PM MDT | Frost Advisory | BOI | 19 hr |
| Oct 21, 6:55 AM MDT | Freeze Warning | BOI | 27 hr |
| Nov 12, 1:44 PM MST | Wind Advisory | BOI | 19 hr |
| Nov 13, 9:11 AM MST | High Wind Warning | BOI | 9 hr |
| Nov 14, 3:51 AM MST | Winter Weather Advisory | BOI | 31 hr |
| Nov 30, 2:34 PM MST | Air Stagnation Advisory | BOI | 10 days |
| Dec 12, 3:04 AM MST | Winter Weather Advisory | BOI | 48 hr |
| Dec 21, 1:59 PM MST | Wind Advisory | BOI | 28 hr |
| Dec 29, 4:41 AM MST | Dense Fog Advisory | BOI | 6 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 | |
| Severe Thunderstorm Warning | 5 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 15 |
| Winter | |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 19 |
| Fire Weather Watch | 9 |
| Fog and smoke | |
| Air Stagnation Advisory | 1 |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe 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.