Alert archive / Idaho / Washington County
Weather alerts in Washington County, Idaho, 2020
51 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 51
- Warnings
- 12
- Watches
- 7
- Advisories
- 23
- Busiest month
- August9 alerts
- Busiest day
- August 17, 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.
Washington County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 0 | 100% | 2 | 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 8, 2:44 PM MST | Winter Storm Watch | BOI | 37 hr |
| Jan 10, 3:29 AM MST | Winter Storm Warning | BOI | 5 days |
| Jan 16, 3:20 AM MST | Winter Weather Advisory | BOI | 30 hr |
| Jan 27, 9:51 AM MST | Winter Weather Advisory | BOI | 31 hr |
| Feb 4, 3:02 AM MST | Winter Weather Advisory | BOI | 56 hr |
| Feb 14, 1:28 PM MST | Winter Weather Advisory | BOI | 49 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 30, 11:36 AM MDT | Mesoscale Discussion | SPC | 84 min |
| May 5, 2:40 AM MDT | Wind Advisory | BOI | 39 hr |
| May 6, 2:11 PM MDT | Frost Advisory | BOI | 12 hr |
| May 7, 2:31 AM MDT | Frost Advisory | BOI | 5 hr |
| May 17, 3:01 PM MDT | Mesoscale Discussion | SPC | 119 min |
| May 31, 2:38 AM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 1:46 PM MDT | Mesoscale Discussion | SPC | 119 min |
| Jun 12, 2:52 PM MDT | Wind Advisory | BOI | 11 hr |
| Jun 13, 8:08 AM MDT | Special Weather Statement | BOI | 52 min |
| Jun 24, 4:21 PM MDT | Severe Thunderstorm Warning | BOI | 39 min |
| Jun 24, 4:57 PM MDT | Severe Thunderstorm Warning | BOI | 18 min |
| Jun 28, 3:55 AM MDT | Flash Flood Watch | BOI | 10 hr |
| Jul 20, 1:06 PM MDT | Fire Weather Watch | BOI | 24 hr |
| Jul 21, 1:01 PM MDT | Red Flag Warning | BOI | 56 hr |
| Jul 28, 2:38 PM MDT | Excessive Heat Warning | BOI | 3 days |
| Jul 31, 1:56 AM MDT | Heat Advisory | BOI | 66 hr |
| Aug 14, 9:16 AM MDT | Excessive Heat Watch | BOI | 28 hr |
| Aug 15, 1:42 PM MDT | Excessive Heat Warning | BOI | 4 days |
| Aug 16, 7:56 AM MDT | Red Flag Warning | BOI | 4 days |
| Aug 17, 4:19 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 17, 4:59 PM MDT | Special Weather Statement | BOI | 46 min |
| Aug 17, 5:27 PM MDT | Mesoscale Discussion | SPC | 93 min |
| Aug 17, 5:58 PM MDT | Special Weather Statement | BOI | 47 min |
| Aug 17, 6:51 PM MDT | Severe Thunderstorm Warning | BOI | 39 min |
| Aug 18, 4:21 PM MDT | Mesoscale Discussion | SPC | 84 min |
| Sep 5, 6:41 PM MDT | High Wind Watch | BOI | 18 hr |
| Sep 5, 6:41 PM MDT | Wind Advisory | BOI | 53 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 15, 2:16 PM MDT | Frost Advisory | BOI | 19 hr |
| Oct 21, 6:55 AM MDT | Freeze Warning | BOI | 27 hr |
| Nov 11, 2:50 PM MST | Winter Storm Watch | BOI | 23 hr |
| Nov 12, 1:44 PM MST | Winter Storm Warning | BOI | 32 hr |
| Nov 12, 1:44 PM MST | Winter Weather Advisory | BOI | 32 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 15, 2:17 PM MST | Winter Weather Advisory | BOI | 45 hr |
| Dec 16, 9:40 AM MST | Dense Fog Advisory | BOI | 3 hr |
| Dec 18, 2:14 PM MST | Winter Weather Advisory | BOI | 42 hr |
| Dec 24, 2:29 AM MST | Winter Weather Advisory | BOI | 63 hr |
| Dec 26, 8:54 PM MST | Dense Fog Advisory | BOI | 16 hr |
| Dec 30, 2:30 AM MST | Winter Weather Advisory | BOI | 27 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 | 3 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 6 |
| Special Weather Statement | 3 |
| Flooding | |
| Flash Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 11 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 4 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Air Stagnation Advisory | 1 |
| Dense Fog Advisory | 2 |
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.