Alert archive / Idaho / Lewis County
Weather alerts in Lewis County, Idaho, 2011
31 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lewis County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 31
- Warnings
- 3
- Watches
- 2
- Advisories
- 15
- Busiest month
- June6 alerts
- Busiest day
- June 22, 20113 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lewis County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 1 | 0% | 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 Spokane, WA: tornado warnings | 0 | 1 | 0% | |||
| NWS Spokane, WA: severe thunderstorm warnings | 3 | 2 | 33% | 6 | 50% | 8 min |
| NWS Spokane, WA: flash flood warnings | 2 | 0 | 100% | 2 | 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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 7, 3:39 AM PST | Winter Weather Advisory | OTX | 71 hr |
| Jan 14, 3:46 PM PST | Flood Watch | OTX | 68 hr |
| Jan 16, 10:25 AM PST | Areal Flood Advisory | OTX | 51 hr |
| Jan 18, 3:43 AM PST | Winter Weather Advisory | OTX | 24 hr |
| Feb 7, 3:13 AM PST | Winter Weather Advisory | OTX | 35 hr |
| Feb 15, 4:09 AM PST | Winter Weather Advisory | OTX | 2 hr |
| Feb 15, 6:09 AM PST | Winter Storm Warning | OTX | 27 hr |
| Feb 21, 3:03 PM PST | Winter Weather Advisory | OTX | 4 days |
| Feb 26, 7:21 PM PST | Winter Weather Advisory | OTX | 66 hr |
| Mar 20, 2:33 PM PDT | Winter Weather Advisory | OTX | 44 hr |
| Mar 29, 3:17 PM PDT | Wind Advisory | OTX | 53 hr |
| Apr 3, 12:08 PM PDT | Flood Watch | OTX | 24 hr |
| Apr 4, 12:11 PM PDT | Areal Flood Advisory | OTX | 44 hr |
| May 29, 3:55 PM PDT | Special Weather Statement | OTX | 65 min |
| Jun 22, 4:15 PM PDT | Special Weather Statement | OTX | 60 min |
| Jun 22, 4:39 PM PDT | Mesoscale Discussion | SPC | 96 min |
| Jun 22, 4:45 PM PDT | Special Weather Statement | MSO | 60 min |
| Jun 22, 7:25 PM PDT | Severe Thunderstorm Warning | OTX | 51 min |
| Jun 22, 8:28 PM PDT | Special Weather Statement | MSO | 47 min |
| Jun 28, 7:58 PM PDT | Special Weather Statement | OTX | 47 min |
| Jul 16, 1:04 PM PDT | Mesoscale Discussion | SPC | 56 min |
| Jul 16, 6:01 PM PDT | Special Weather Statement | OTX | 44 min |
| Jul 19, 2:32 PM PDT | Special Weather Statement | OTX | 58 min |
| Aug 1, 7:44 PM PDT | Special Weather Statement | MSO | 46 min |
| Aug 1, 9:14 PM PDT | Special Weather Statement | MSO | 46 min |
| Aug 28, 1:52 AM PDT | Red Flag Warning | MSO | 26 hr |
| Nov 12, 2:04 PM PST | Winter Weather Advisory | OTX | 19 hr |
| Nov 18, 2:26 AM PST | Winter Weather Advisory | OTX | 20 hr |
| Nov 21, 2:07 PM PST | Wind Advisory | OTX | 49 hr |
| Nov 29, 3:45 AM PST | Winter Weather Advisory | OTX | 31 hr |
| Dec 27, 2:39 PM PST | Wind Advisory | OTX | 22 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 | 1 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 9 |
| Flooding | |
| Flood Watch | 2 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 10 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
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.