Alert archive / California / Butte County
Weather alerts in Butte County, California, 2018
18 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Butte County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 18
- Warnings
- 5
- Watches
- 0
- Advisories
- 7
- Busiest month
- March7 alerts
- Busiest day
- March 14, 20183 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Butte County in 2018 had a tornado report inside them.
Butte County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 2 | 0 | 100% | 0 | ||
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sacramento, CA: tornado warnings | 3 | 1 | 67% | 4 | 100% | 7 min |
| NWS Sacramento, CA: severe thunderstorm warnings | 4 | 0 | 100% | 1 | 0% | |
| NWS Sacramento, CA: flash flood warnings | 5 | 0 | 100% | 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 8, 11:22 PM PST | Areal Flood Advisory | STO | 10 hr |
| Jan 25, 2:15 PM PST | Tornado Warning | STO | 30 min |
| Feb 26, 3:06 PM PST | Areal Flood Advisory | STO | 3 hr |
| Mar 14, 12:55 PM PDT | Special Weather Statement | STO | 50 min |
| Mar 14, 2:32 PM PDT | Special Weather Statement | STO | 58 min |
| Mar 14, 4:24 PM PDT | Special Weather Statement | STO | 66 min |
| Mar 14, 5:33 PM PDT | Areal Flood Advisory | STO | 117 min |
| Mar 16, 5:24 PM PDT | Severe Thunderstorm Warning | STO | 36 min |
| Mar 16, 6:02 PM PDT | Severe Thunderstorm Warning | STO | 28 min |
| Mar 22, 11:15 AM PDT | Areal Flood Advisory | STO | 6 hr |
| Apr 7, 7:15 AM PDT | Areal Flood Advisory | STO | 6 hr |
| May 22, 1:03 PM PDT | Special Weather Statement | STO | 27 min |
| May 22, 1:59 PM PDT | Special Weather Statement | STO | 31 min |
| Oct 3, 4:49 PM PDT | Special Weather Statement | STO | 56 min |
| Nov 29, 12:00 AM PST | Areal Flood Advisory | STO | 6 hr |
| Nov 29, 11:51 AM PST | Flash Flood Warning | STO | 3 hr |
| Nov 29, 2:23 PM PST | Flash Flood Warning | STO | 7 hr |
| Dec 16, 4:54 PM PST | Areal Flood Advisory | STO | 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 | |
| Severe Thunderstorm Warning | 2 |
| Tornado Warning | 1 |
| Special Weather Statement | 6 |
| Flooding | |
| Flash Flood Warning | 2 |
| Areal Flood Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.