Alert archive / Idaho / Nez Perce County
Weather alerts in Nez Perce County, Idaho, 2009
43 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Nez Perce County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 43
- Warnings
- 17
- Watches
- 9
- Advisories
- 13
- Busiest month
- March10 alerts
- Busiest day
- March 28, 20093 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Nez Perce County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 2 | 50% | 37 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Spokane, WA: tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| NWS Spokane, WA: severe thunderstorm warnings | 27 | 11 | 59% | 27 | 74% | 17 min |
| NWS Spokane, WA: flash flood warnings | 7 | 3 | 57% | 6 | 67% | 20 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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 4, 5:01 AM PST | Winter Storm Warning | OTX | 35 hr |
| Jan 4, 12:06 PM PST | Winter Weather Advisory | OTX | 24 hr |
| Jan 4, 10:04 PM PST | Mesoscale Discussion | SPC | 4 hr |
| Jan 5, 4:08 PM PST | Flood Watch | OTX | 22 hr |
| Jan 6, 2:54 PM PST | Areal Flood Warning | OTX | 3 days |
| Jan 10, 12:33 PM PST | Winter Storm Warning | OTX | 16 hr |
| Jan 13, 9:39 AM PST | Air Stagnation Advisory | OTX | 11 days |
| Feb 20, 5:29 AM PST | Dense Fog Advisory | OTX | 6 hr |
| Mar 3, 2:59 PM PST | Winter Storm Watch | OTX | 38 hr |
| Mar 4, 3:14 PM PST | Winter Storm Warning | OTX | 37 hr |
| Mar 9, 3:50 AM PDT | Winter Weather Advisory | OTX | 31 hr |
| Mar 23, 2:31 PM PDT | Winter Storm Watch | OTX | 25 hr |
| Mar 24, 2:44 AM PDT | Winter Storm Warning | OTX | 49 hr |
| Mar 28, 3:25 AM PDT | Winter Storm Watch | OTX | 12 hr |
| Mar 28, 3:25 AM PDT | Winter Storm Warning | OTX | 39 hr |
| Mar 28, 9:29 AM PDT | Winter Weather Advisory | OTX | 25 hr |
| Mar 30, 3:20 PM PDT | Winter Weather Advisory | OTX | 29 hr |
| Mar 31, 3:29 AM PDT | Winter Storm Warning | OTX | 23 hr |
| Apr 1, 3:42 AM PDT | Winter Weather Advisory | OTX | 49 hr |
| Apr 23, 2:47 PM PDT | Freeze Warning | OTX | 18 hr |
| May 11, 1:43 PM PDT | Freeze Watch | OTX | 25 hr |
| May 18, 6:07 PM PDT | Mesoscale Discussion | SPC | 83 min |
| May 18, 8:53 PM PDT | Severe Thunderstorm Warning | OTX | 37 min |
| May 18, 9:17 PM PDT | Severe Thunderstorm Warning | OTX | 32 min |
| Jun 4, 11:10 AM PDT | Flash Flood Watch | OTX | 11 hr |
| Jul 5, 4:25 PM PDT | Mesoscale Discussion | SPC | 65 min |
| Jul 12, 8:23 PM PDT | Severe Thunderstorm Warning | OTX | 45 min |
| Jul 12, 8:48 PM PDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 13, 5:10 AM PDT | Areal Flood Advisory | OTX | 3 hr |
| Aug 6, 3:30 PM PDT | Flood Watch | OTX | 22 hr |
| Aug 6, 4:12 PM PDT | Special Weather Statement | OTX | 48 min |
| Oct 5, 2:47 PM PDT | Freeze Warning | OTX | 18 hr |
| Oct 8, 2:37 PM PDT | Freeze Warning | OTX | 13 hr |
| Oct 9, 3:13 AM PDT | Freeze Warning | OTX | 31 hr |
| Oct 10, 2:36 PM PDT | Freeze Warning | OTX | 19 hr |
| Oct 11, 2:42 PM PDT | Freeze Warning | OTX | 19 hr |
| Nov 11, 2:18 PM PST | Winter Weather Advisory | OTX | 16 hr |
| Nov 27, 1:09 PM PST | Dense Fog Advisory | OTX | 3 hr |
| Dec 11, 3:23 AM PST | Winter Storm Watch | OTX | 11 hr |
| Dec 11, 2:29 PM PST | Winter Storm Warning | OTX | 44 hr |
| Dec 22, 3:02 AM PST | Winter Weather Advisory | OTX | 7 hr |
| Dec 23, 3:18 PM PST | Air Stagnation Advisory | OTX | 7 days |
| Dec 29, 4:14 AM PST | Winter Weather Advisory | OTX | 30 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
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.