Alert archive / Idaho / Elmore County
Weather alerts in Elmore County, Idaho, 2009
96 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Elmore County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 96
- Warnings
- 27
- Watches
- 20
- Advisories
- 43
- Busiest month
- June16 alerts
- Busiest day
- August 6, 200913 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Elmore County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 0 | 100% | 0 | ||
| Flash flood warnings | 6 | 1 | 83% | 1 | 0% |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boise, ID: tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| NWS Boise, ID: severe thunderstorm warnings | 36 | 3 | 92% | 10 | 30% | 16 min |
| NWS Boise, ID: flash flood warnings | 9 | 3 | 67% | 10 | 30% | 60 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 3, 3:05 PM MST | Winter Storm Watch | BOI | 23 hr |
| Jan 4, 1:44 PM MST | Winter Storm Warning | BOI | 25 hr |
| Jan 4, 1:44 PM MST | Winter Weather Advisory | BOI | 30 hr |
| Jan 5, 3:13 PM MST | Winter Weather Advisory | BOI | 26 hr |
| Jan 10, 10:04 AM MST | Winter Weather Advisory | BOI | 20 hr |
| Jan 13, 5:21 AM MST | Dense Fog Advisory | BOI | 10 hr |
| Jan 13, 3:08 PM MST | Dense Fog Advisory | BOI | 21 hr |
| Jan 14, 2:25 PM MST | Dense Fog Advisory | BOI | 22 hr |
| Jan 22, 11:31 PM MST | Winter Weather Advisory | BOI | 13 hr |
| Jan 25, 8:53 AM MST | Winter Weather Advisory | BOI | 5 hr |
| Jan 25, 3:07 PM MST | Winter Weather Advisory | BOI | 24 hr |
| Feb 9, 5:48 AM MST | Dense Fog Advisory | BOI | 2 hr |
| Feb 10, 12:33 PM MST | Winter Weather Advisory | BOI | 22 hr |
| Feb 25, 3:10 PM MST | Wind Advisory | BOI | 27 hr |
| Mar 4, 10:33 AM MST | Winter Weather Advisory | BOI | 12 hr |
| Mar 4, 2:59 PM MST | Winter Storm Watch | BOI | 13 hr |
| Mar 5, 4:06 AM MST | Winter Weather Advisory | BOI | 34 hr |
| Mar 5, 6:03 PM MST | Winter Storm Warning | BOI | 13 hr |
| Mar 13, 4:17 AM MDT | Winter Storm Watch | BOI | 10 hr |
| Mar 13, 2:45 PM MDT | Winter Storm Warning | BOI | 3 days |
| Mar 16, 5:50 PM MDT | Winter Weather Advisory | BOI | 10 hr |
| Mar 23, 1:31 AM MDT | Wind Advisory | BOI | 12 hr |
| Mar 23, 3:05 PM MDT | Winter Storm Watch | BOI | 23 hr |
| Mar 24, 2:09 PM MDT | Winter Storm Warning | BOI | 37 hr |
| Mar 24, 2:09 PM MDT | Winter Weather Advisory | BOI | 37 hr |
| Mar 28, 4:16 AM MDT | Wind Advisory | BOI | 44 hr |
| Mar 28, 3:41 PM MDT | Winter Weather Advisory | BOI | 22 hr |
| Mar 30, 3:26 PM MDT | Winter Weather Advisory | BOI | 31 hr |
| Apr 3, 11:30 AM MDT | Wind Advisory | BOI | 9 hr |
| Apr 12, 8:33 AM MDT | Dense Fog Advisory | BOI | 2 hr |
| Apr 13, 2:51 PM MDT | High Wind Watch | BOI | 12 hr |
| Apr 14, 2:43 AM MDT | Wind Advisory | BOI | 42 hr |
| Apr 14, 12:21 PM MDT | Winter Weather Advisory | BOI | 33 hr |
| May 3, 1:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| May 3, 1:40 PM MDT | Severe Thunderstorm Warning | BOI | 35 min |
| May 11, 4:01 AM MDT | Wind Advisory | BOI | 41 hr |
| May 12, 2:45 PM MDT | Freeze Warning | BOI | 16 hr |
| May 23, 3:00 AM MDT | Flash Flood Watch | BOI | 30 hr |
| Jun 2, 2:07 AM MDT | Flash Flood Watch | BOI | 22 hr |
| Jun 3, 12:01 AM MDT | Areal Flood Warning | BOI | 6 hr |
| Jun 4, 2:09 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 4, 2:30 PM MDT | Flash Flood Warning | BOI | 60 min |
| Jun 4, 8:14 PM MDT | Flash Flood Watch | BOI | 34 hr |
| Jun 5, 3:31 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Jun 11, 5:16 PM MDT | Flash Flood Warning | BOI | 119 min |
| Jun 12, 9:59 AM MDT | Flash Flood Watch | BOI | 35 hr |
| Jun 14, 3:56 AM MDT | Flash Flood Watch | BOI | 20 hr |
| Jun 14, 9:04 AM MDT | Flash Flood Warning | BOI | 3 hr |
| Jun 14, 2:28 PM MDT | Flash Flood Warning | BOI | 92 min |
| Jun 14, 3:22 PM MDT | Flash Flood Warning | BOI | 83 min |
| Jun 15, 3:30 AM MDT | Flash Flood Watch | BOI | 18 hr |
| Jun 21, 3:04 PM MDT | Flash Flood Warning | BOI | 56 min |
| Jun 21, 3:47 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Jun 21, 3:58 PM MDT | Areal Flood Advisory | BOI | 3 hr |
| Jul 3, 3:54 PM MDT | Mesoscale Discussion | SPC | 66 min |
| Jul 5, 5:25 PM MDT | Mesoscale Discussion | SPC | 65 min |
| Jul 5, 6:14 PM MDT | Areal Flood Advisory | BOI | 44 min |
| Aug 6, 7:22 AM MDT | Severe Thunderstorm Warning | BOI | 38 min |
| Aug 6, 7:52 AM MDT | Severe Thunderstorm Warning | BOI | 38 min |
| Aug 6, 8:15 AM MDT | Mesoscale Discussion | SPC | 90 min |
| Aug 6, 8:24 AM MDT | Severe Thunderstorm Warning | BOI | 51 min |
| Aug 6, 9:14 AM MDT | Flash Flood Watch | BOI | 18 hr |
| Aug 6, 9:51 AM MDT | Severe Thunderstorm Warning | BOI | 54 min |
| Aug 6, 10:40 AM MDT | Severe Thunderstorm Warning | BOI | 35 min |
| Aug 6, 11:07 AM MDT | Severe Thunderstorm Warning | BOI | 38 min |
| Aug 6, 11:38 AM MDT | Severe Thunderstorm Warning | BOI | 37 min |
| Aug 6, 12:04 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Aug 6, 12:34 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 6, 1:23 PM MDT | Severe Thunderstorm Warning | BOI | 25 min |
| Aug 6, 1:53 PM MDT | Severe Thunderstorm Warning | BOI | 19 min |
| Aug 29, 8:42 PM MDT | Severe Thunderstorm Warning | BOI | 34 min |
| Aug 30, 9:33 AM MDT | Flash Flood Watch | BOI | 10 hr |
| Aug 30, 11:57 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 30, 2:18 AM MDT | Freeze Watch | BOI | 13 hr |
| Sep 30, 3:08 PM MDT | Freeze Warning | BOI | 18 hr |
| Oct 1, 3:38 PM MDT | Winter Storm Watch | BOI | 35 hr |
| Oct 4, 8:14 AM MDT | Winter Weather Advisory | BOI | 22 hr |
| Oct 8, 3:24 PM MDT | Wind Advisory | BOI | 29 hr |
| Oct 10, 3:10 AM MDT | Wind Advisory | BOI | 23 hr |
| Oct 10, 3:08 PM MDT | Freeze Watch | BOI | 24 hr |
| Oct 26, 3:06 PM MDT | Wind Advisory | BOI | 12 hr |
| Oct 26, 7:58 PM MDT | High Wind Warning | BOI | 4 hr |
| Nov 21, 2:54 AM MST | Winter Storm Watch | BOI | 12 hr |
| Nov 21, 2:53 PM MST | Winter Weather Advisory | BOI | 23 hr |
| Dec 6, 3:01 AM MST | Wind Chill Warning | BOI | 25 hr |
| Dec 7, 4:04 AM MST | Winter Weather Advisory | BOI | 5 hr |
| Dec 11, 1:27 PM MST | Winter Weather Advisory | BOI | 46 hr |
| Dec 13, 3:39 AM MST | Dense Fog Advisory | BOI | 107 min |
| Dec 13, 1:55 PM MST | Winter Storm Watch | BOI | 24 hr |
| Dec 13, 5:37 PM MST | Dense Fog Advisory | BOI | 15 hr |
| Dec 14, 1:53 PM MST | Winter Storm Warning | BOI | 41 hr |
| Dec 14, 1:53 PM MST | Winter Weather Advisory | BOI | 32 hr |
| Dec 17, 2:36 PM MST | Dense Fog Advisory | BOI | 15 hr |
| Dec 19, 3:01 AM MST | Dense Fog Advisory | BOI | 7 hr |
| Dec 21, 2:23 PM MST | Winter Weather Advisory | BOI | 23 hr |
| Dec 29, 2:20 AM MST | Winter Weather Advisory | BOI | 32 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 | 11 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 6 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 6 |
| Flash Flood Watch | 8 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 21 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 1 |
| Freeze Watch | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 9 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe 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.