Alert archive / Washington / Chelan County
Weather alerts in Chelan County, Washington, 2011
30 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Chelan County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 30
- Warnings
- 5
- Watches
- 7
- Advisories
- 17
- Busiest month
- January8 alerts
- Busiest day
- January 10, 20112 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Chelan County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 0 | 1 | 0% |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Seattle, WA: tornado warnings | 0 | 2 | 0% | |||
| NWS Seattle, WA: severe thunderstorm warnings | 2 | 0 | 100% | 1 | 0% | |
| NWS Portland, OR: severe thunderstorm warnings | 10 | 2 | 80% | 6 | 67% | 15 min |
| 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% | |
| NWS Pendleton, OR: tornado warnings | 0 | 1 | 0% | |||
| NWS Pendleton, OR: severe thunderstorm warnings | 12 | 5 | 58% | 11 | 55% | 21 min |
| NWS Pendleton, OR: flash flood warnings | 5 | 3 | 40% | 4 | 100% | 84 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 3, 3:08 PM PST | Air Stagnation Advisory | OTX | 4 days |
| Jan 7, 1:30 AM PST | Winter Weather Advisory | OTX | 10 hr |
| Jan 10, 2:38 AM PST | Winter Storm Watch | OTX | 32 hr |
| Jan 10, 1:55 PM PST | Winter Storm Warning | OTX | 3 days |
| Jan 14, 3:46 PM PST | Flood Watch | OTX | 68 hr |
| Jan 15, 7:46 PM PST | Areal Flood Advisory | OTX | 40 hr |
| Jan 16, 3:44 AM PST | Wind Advisory | OTX | 39 hr |
| Jan 21, 4:38 AM PST | Wind Advisory | OTX | 15 hr |
| Feb 6, 3:52 AM PST | Wind Advisory | OTX | 35 hr |
| Feb 21, 3:03 PM PST | Winter Storm Warning | OTX | 4 days |
| Feb 21, 3:03 PM PST | Winter Weather Advisory | OTX | 4 days |
| Feb 27, 5:02 PM PST | Mesoscale Discussion | SPC | 6 hr |
| Mar 29, 3:17 PM PDT | Wind Advisory | OTX | 53 hr |
| Mar 31, 8:50 AM PDT | Areal Flood Advisory | OTX | 11 hr |
| Apr 1, 2:00 PM PDT | Areal Flood Advisory | OTX | 22 hr |
| Apr 3, 12:08 PM PDT | Flood Watch | OTX | 24 hr |
| Apr 4, 12:24 PM PDT | Areal Flood Advisory | OTX | 23 hr |
| May 12, 4:21 PM PDT | Flood Watch | OTX | 23 hr |
| May 13, 1:47 PM PDT | River Flood Watch | OTX | 4 days |
| May 13, 3:28 PM PDT | Areal Flood Warning | OTX | 4 days |
| May 14, 11:48 AM PDT | River Flood Warning | OTX | 16 hr |
| Jun 3, 1:21 PM PDT | Flood Watch | OTX | 4 days |
| Jun 7, 11:25 AM PDT | Flood Watch | OTX | 4 days |
| Jun 10, 4:08 PM PDT | Areal Flood Advisory | OTX | 2 hr |
| Nov 13, 8:19 AM PST | Wind Advisory | OTX | 11 hr |
| Nov 15, 3:19 PM PST | Winter Weather Advisory | OTX | 37 hr |
| Dec 1, 10:26 AM PST | Air Stagnation Advisory | OTX | 19 days |
| Dec 27, 11:00 PM PST | Winter Storm Warning | OTX | 7 hr |
| Dec 29, 4:19 AM PST | Winter Weather Advisory | OTX | 39 hr |
| Dec 30, 9:42 PM PST | Wind Advisory | OTX | 6 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 | |
| Mesoscale Discussion | 1 |
| Flooding | |
| Areal Flood Warning | 1 |
| River Flood Warning | 1 |
| Flood Watch | 5 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 6 |
| Fog and smoke | |
| Air Stagnation Advisory | 2 |
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.