Alert archive / Washington / Thurston County
Weather alerts in Thurston County, Washington, 2021
16 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Thurston County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 16
- Warnings
- 8
- Watches
- 5
- Advisories
- 3
- Busiest month
- January9 alerts
- Busiest day
- January 3, 20214 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Thurston County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Seattle, WA: tornado warnings | 5 | 0 | 100% | 0 | ||
| NWS Seattle, WA: severe thunderstorm warnings | 5 | 2 | 60% | 5 | 40% | 21 min |
| NWS Seattle, WA: flash flood warnings | 0 | 4 | 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 1, 11:58 AM PST | Flood Watch | SEW | 50 hr |
| Jan 2, 8:48 PM PST | Areal Flood Warning | SEW | 56 min |
| Jan 2, 11:41 PM PST | Areal Flood Advisory | SEW | 2 hr |
| Jan 3, 4:31 AM PST | River Flood Warning | SEW | 35 hr |
| Jan 3, 6:16 AM PST | River Flood Warning | SEW | 4 days |
| Jan 10, 2:52 PM PST | Flood Watch | SEW | 4 days |
| Jan 12, 8:02 AM PST | Areal Flood Advisory | SEW | 7 hr |
| Jan 12, 1:59 PM PST | River Flood Warning | SEW | 3 days |
| Jan 12, 4:32 PM PST | River Flood Warning | SEW | 43 hr |
| Feb 22, 8:57 AM PST | Flood Watch | SEW | 17 hr |
| Feb 23, 1:37 AM PST | River Flood Warning | SEW | 20 hr |
| Feb 23, 8:17 AM PST | Flood Watch | SEW | 44 hr |
| Oct 28, 5:53 PM PDT | Areal Flood Advisory | SEW | 15 hr |
| Nov 9, 2:27 PM PST | Severe Thunderstorm Warning | SEW | 33 min |
| Nov 10, 12:56 PM PST | Flood Watch | SEW | 6 days |
| Nov 12, 11:56 AM PST | River Flood Warning | SEW | 40 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 |
| Flooding | |
| Areal Flood Warning | 1 |
| River Flood Warning | 6 |
| Flood Watch | 5 |
| Areal Flood Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.