Alert archive / Idaho / Lemhi County
Weather alerts in Lemhi County, Idaho, 2009
64 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lemhi County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 64
- Warnings
- 11
- Watches
- 11
- Advisories
- 23
- Busiest month
- August13 alerts
- Busiest day
- August 6, 20096 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lemhi County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 2 | 50% | 6 | 100% | 32 min |
| Flash flood warnings | 0 | 3 | 0% |
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 Missoula, MT: flash flood warnings | 3 | 1 | 67% | 8 | 13% | 48 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 1, 12:57 PM MST | Winter Weather Advisory | MSO | 28 hr |
| Jan 5, 2:20 PM MST | Wind Advisory | MSO | 3 days |
| Jan 7, 8:53 AM MST | Freezing Rain Advisory | MSO | 2 hr |
| Feb 8, 1:05 AM MST | Dense Fog Advisory | MSO | 10 hr |
| Mar 4, 10:08 AM MST | Winter Weather Advisory | MSO | 9 hr |
| Mar 4, 2:29 PM MST | Winter Weather Advisory | MSO | 44 hr |
| Mar 13, 2:44 PM MDT | Winter Weather Advisory | MSO | 3 days |
| Mar 14, 9:07 PM MDT | Winter Storm Warning | MSO | 47 hr |
| Mar 16, 5:44 PM MDT | Winter Weather Advisory | MSO | 10 hr |
| Mar 22, 1:46 PM MDT | Winter Weather Advisory | MSO | 14 hr |
| Mar 22, 8:05 PM MDT | Winter Storm Warning | MSO | 7 hr |
| Mar 28, 4:10 AM MDT | Winter Storm Warning | MSO | 44 hr |
| Mar 28, 4:10 AM MDT | Winter Weather Advisory | MSO | 44 hr |
| Apr 14, 9:02 AM MDT | Winter Weather Advisory | MSO | 30 hr |
| Apr 27, 2:35 PM MDT | Winter Weather Advisory | MSO | 39 hr |
| May 3, 1:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| May 11, 2:41 PM MDT | Winter Weather Advisory | MSO | 30 hr |
| May 19, 4:10 AM MDT | Wind Advisory | MSO | 16 hr |
| May 19, 2:47 PM MDT | High Wind Warning | MSO | 6 hr |
| Jun 4, 11:39 AM MDT | Flash Flood Watch | MSO | 9 hr |
| Jun 4, 4:09 PM MDT | Special Weather Statement | MSO | 36 min |
| Jun 5, 4:22 AM MDT | Flash Flood Watch | MSO | 20 hr |
| Jun 20, 3:34 AM MDT | Flash Flood Watch | MSO | 11 hr |
| Jun 20, 2:44 PM MDT | River Flood Watch | MSO | 4 hr |
| Jun 20, 7:00 PM MDT | River Flood Warning | MSO | 43 hr |
| Jun 21, 9:08 AM MDT | Areal Flood Warning | MSO | 29 hr |
| Jul 6, 12:52 PM MDT | Special Weather Statement | MSO | 23 min |
| Jul 6, 1:27 PM MDT | Special Weather Statement | MSO | 33 min |
| Jul 6, 1:33 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 9, 7:08 PM MDT | Special Weather Statement | MSO | 67 min |
| Jul 12, 7:50 PM MDT | Special Weather Statement | MSO | 55 min |
| Jul 12, 7:59 PM MDT | Special Weather Statement | MSO | 61 min |
| Jul 23, 4:31 PM MDT | Special Weather Statement | MSO | 44 min |
| Jul 24, 1:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jul 24, 1:34 PM MDT | Special Weather Statement | MSO | 86 min |
| Jul 25, 12:40 PM MDT | Mesoscale Discussion | SPC | 95 min |
| Jul 25, 1:24 PM MDT | Special Weather Statement | MSO | 51 min |
| Aug 2, 7:25 PM MDT | Special Weather Statement | MSO | 50 min |
| Aug 5, 2:47 PM MDT | Special Weather Statement | MSO | 28 min |
| Aug 6, 10:29 AM MDT | Flash Flood Watch | MSO | 10 hr |
| Aug 6, 11:35 AM MDT | Severe Thunderstorm Warning | MSO | 40 min |
| Aug 6, 12:04 PM MDT | Mesoscale Discussion | SPC | 56 min |
| Aug 6, 12:15 PM MDT | Severe Thunderstorm Warning | MSO | 45 min |
| Aug 6, 12:34 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 6, 1:59 PM MDT | Severe Thunderstorm Warning | MSO | 61 min |
| Aug 6, 9:55 PM MDT | Special Weather Statement | MSO | 50 min |
| Aug 13, 2:54 PM MDT | Severe Thunderstorm Warning | MSO | 21 min |
| Aug 22, 1:31 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Aug 30, 1:05 AM MDT | Areal Flood Advisory | MSO | 4 hr |
| Aug 30, 2:45 AM MDT | Flash Flood Watch | MSO | 21 hr |
| Sep 4, 6:28 PM MDT | Special Weather Statement | MSO | 47 min |
| Sep 6, 7:15 PM MDT | Special Weather Statement | MSO | 60 min |
| Sep 20, 2:39 PM MDT | Frost Advisory | MSO | 18 hr |
| Sep 29, 5:44 AM MDT | Wind Advisory | MSO | 3 hr |
| Sep 29, 2:37 PM MDT | Winter Weather Advisory | MSO | 13 hr |
| Oct 2, 1:48 PM MDT | Winter Storm Watch | MSO | 38 hr |
| Oct 4, 3:36 AM MDT | Winter Storm Warning | MSO | 32 hr |
| Oct 25, 3:54 AM MDT | Winter Storm Watch | MSO | 24 hr |
| Oct 26, 3:59 AM MDT | Winter Weather Advisory | MSO | 32 hr |
| Nov 11, 3:23 AM MST | Winter Weather Advisory | MSO | 32 hr |
| Dec 4, 2:05 PM MST | Wind Chill Advisory | MSO | 69 hr |
| Dec 13, 9:17 PM MST | Flood Watch | MSO | 13 hr |
| Dec 29, 4:30 PM MST | Areal Flood Advisory | MSO | 18 hr |
| Dec 30, 5:00 PM MST | Areal Flood Advisory | MSO | 19 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 | 4 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 14 |
| Flooding | |
| Areal Flood Warning | 1 |
| River Flood Warning | 1 |
| Flash Flood Watch | 5 |
| Flood Watch | 1 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 2 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 13 |
| Cold | |
| Frost Advisory | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 3 |
| 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 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.