Alert archive / Idaho / Twin Falls County
Weather alerts in Twin Falls County, Idaho, 2011
38 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 38
- Warnings
- 6
- Watches
- 3
- Advisories
- 20
- Busiest month
- April5 alerts
- Busiest day
- August 4, 20114 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, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 2 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Boise, ID: severe thunderstorm warnings | 13 | 2 | 85% | 16 | 19% | 26 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 17, 3:35 AM MST | Wind Advisory | BOI | 13 hr |
| Jan 25, 6:04 AM MST | Dense Fog Advisory | BOI | 7 hr |
| Jan 25, 2:55 PM MST | Dense Fog Advisory | BOI | 11 hr |
| Feb 6, 1:28 PM MST | Wind Advisory | BOI | 29 hr |
| Feb 18, 2:44 PM MST | Winter Weather Advisory | BOI | 32 hr |
| Feb 24, 3:33 AM MST | Winter Weather Advisory | BOI | 37 hr |
| Feb 25, 3:56 AM MST | Winter Storm Warning | BOI | 19 hr |
| Mar 6, 3:00 PM MST | Winter Weather Advisory | BOI | 23 hr |
| Mar 20, 11:49 PM MDT | High Wind Warning | BOI | 76 min |
| Mar 30, 2:24 PM MDT | Wind Advisory | BOI | 6 hr |
| Apr 1, 6:02 AM MDT | Wind Advisory | BOI | 36 hr |
| Apr 6, 2:31 PM MDT | Winter Weather Advisory | BOI | 21 hr |
| Apr 21, 11:42 AM MDT | Wind Advisory | BOI | 9 hr |
| Apr 25, 3:48 AM MDT | Wind Advisory | BOI | 13 hr |
| Apr 26, 3:13 AM MDT | Wind Advisory | BOI | 17 hr |
| May 7, 1:41 PM MDT | Wind Advisory | BOI | 54 hr |
| Jun 6, 1:33 PM MDT | Severe Thunderstorm Warning | BOI | 32 min |
| Jun 22, 5:39 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 7, 5:53 PM MDT | Special Weather Statement | BOI | 52 min |
| Jul 8, 1:09 PM MDT | Special Weather Statement | LKN | 36 min |
| Jul 11, 2:53 PM MDT | Mesoscale Discussion | SPC | 97 min |
| Jul 31, 3:42 AM MDT | Flash Flood Watch | BOI | 24 hr |
| Jul 31, 2:30 PM MDT | Flash Flood Watch | BOI | 13 hr |
| Aug 4, 2:27 PM MDT | Special Weather Statement | BOI | 48 min |
| Aug 4, 3:12 PM MDT | Special Weather Statement | BOI | 48 min |
| Aug 4, 5:19 PM MDT | Special Weather Statement | BOI | 26 min |
| Aug 4, 5:28 PM MDT | Severe Thunderstorm Warning | BOI | 32 min |
| Aug 6, 2:58 PM MDT | Special Weather Statement | BOI | 47 min |
| Oct 3, 5:11 PM MDT | Special Weather Statement | BOI | 49 min |
| Oct 5, 3:18 PM MDT | Wind Advisory | BOI | 27 hr |
| Oct 23, 2:59 AM MDT | Freeze Watch | BOI | 12 hr |
| Oct 23, 2:34 PM MDT | Freeze Warning | BOI | 43 hr |
| Nov 11, 3:08 AM MST | Wind Advisory | BOI | 36 hr |
| Nov 13, 3:37 AM MST | Wind Advisory | BOI | 13 hr |
| Nov 18, 9:06 AM MST | Winter Storm Warning | BOI | 9 hr |
| Nov 25, 11:18 AM MST | Wind Advisory | BOI | 5 hr |
| Nov 30, 10:38 AM MST | Wind Advisory | BOI | 6 hr |
| Dec 29, 2:18 PM MST | Wind Advisory | BOI | 37 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 | 2 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 7 |
| Flooding | |
| Flash Flood Watch | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Weather Advisory | 4 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 14 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.