Alert archive / California / Lassen County
Weather alerts in Lassen County, California, 2019
66 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lassen County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 66
- Warnings
- 20
- Watches
- 19
- Advisories
- 18
- Busiest month
- February12 alerts
- Busiest day
- August 10, 20194 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lassen County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 2 | 0 | 100% | 0 | ||
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Reno, NV: severe thunderstorm warnings | 7 | 0 | 100% | 3 | 0% | |
| NWS Reno, NV: flash flood warnings | 6 | 0 | 100% | 1 | 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 2, 2:23 PM PST | Winter Storm Watch | REV | 37 hr |
| Jan 4, 3:04 AM PST | Winter Storm Warning | REV | 3 days |
| Jan 14, 3:38 PM PST | Winter Storm Watch | REV | 23 hr |
| Jan 14, 3:38 PM PST | Winter Weather Advisory | REV | 48 hr |
| Jan 15, 2:14 PM PST | Winter Storm Warning | REV | 57 hr |
| Jan 18, 12:04 PM PST | Winter Storm Watch | REV | 24 hr |
| Jan 19, 12:10 PM PST | Winter Weather Advisory | REV | 40 hr |
| Jan 30, 2:12 PM PST | Winter Storm Watch | REV | 24 hr |
| Jan 31, 2:15 PM PST | Winter Storm Warning | REV | 5 days |
| Feb 7, 1:30 PM PST | Winter Storm Watch | REV | 25 hr |
| Feb 7, 1:30 PM PST | Winter Storm Warning | REV | 3 days |
| Feb 11, 3:39 AM PST | Winter Storm Watch | REV | 27 hr |
| Feb 12, 6:26 AM PST | High Wind Watch | REV | 23 hr |
| Feb 12, 6:26 AM PST | Winter Storm Warning | REV | 6 days |
| Feb 12, 6:26 AM PST | Winter Weather Advisory | REV | 31 hr |
| Feb 14, 8:19 AM PST | Areal Flood Advisory | REV | 3 hr |
| Feb 19, 1:50 PM PST | Winter Weather Advisory | REV | 21 hr |
| Feb 24, 3:22 AM PST | Winter Storm Watch | REV | 9 hr |
| Feb 24, 12:27 PM PST | Winter Storm Warning | REV | 4 days |
| Feb 24, 12:51 PM PST | High Wind Warning | REV | 33 hr |
| Feb 26, 5:00 AM PST | Wind Advisory | REV | 14 hr |
| Mar 1, 3:45 AM PST | Winter Weather Advisory | REV | 38 hr |
| Mar 2, 2:09 PM PST | Winter Weather Advisory | REV | 18 hr |
| Mar 23, 2:45 PM PDT | Winter Storm Watch | REV | 49 hr |
| Mar 25, 4:29 AM PDT | Winter Weather Advisory | REV | 28 hr |
| Mar 25, 3:25 PM PDT | Winter Storm Warning | REV | 56 hr |
| Apr 9, 4:32 PM PDT | Areal Flood Advisory | REV | 17 hr |
| Apr 10, 8:59 AM PDT | Areal Flood Warning | REV | 30 hr |
| Apr 29, 3:18 PM PDT | Freeze Warning | REV | 42 hr |
| May 6, 1:44 PM PDT | Special Weather Statement | REV | 3 hr |
| May 24, 8:33 PM PDT | Special Weather Statement | REV | 57 min |
| May 24, 9:19 PM PDT | Flash Flood Warning | REV | 3 hr |
| Jun 5, 3:02 PM PDT | Lake Wind Advisory | REV | 30 hr |
| Jun 24, 12:54 PM PDT | Fire Weather Watch | REV | 20 hr |
| Jun 24, 3:42 PM PDT | Lake Wind Advisory | REV | 3 days |
| Jun 25, 9:06 AM PDT | Red Flag Warning | REV | 60 hr |
| Jul 13, 2:39 PM PDT | Lake Wind Advisory | REV | 30 hr |
| Jul 26, 1:45 PM PDT | Special Weather Statement | REV | 3 hr |
| Aug 10, 10:09 AM PDT | Special Weather Statement | REV | 36 min |
| Aug 10, 11:36 AM PDT | Mesoscale Discussion | SPC | 114 min |
| Aug 10, 1:32 PM PDT | Special Weather Statement | REV | 118 min |
| Aug 10, 4:27 PM PDT | Special Weather Statement | REV | 108 min |
| Aug 26, 2:34 PM PDT | Fire Weather Watch | REV | 36 hr |
| Aug 27, 9:34 AM PDT | Red Flag Warning | REV | 34 hr |
| Aug 28, 3:29 PM PDT | Special Weather Statement | REV | 31 min |
| Aug 28, 3:39 PM PDT | Severe Thunderstorm Warning | REV | 22 min |
| Sep 4, 3:10 PM PDT | Severe Thunderstorm Warning | REV | 35 min |
| Sep 5, 1:05 PM PDT | Special Weather Statement | REV | 55 min |
| Sep 8, 12:19 AM PDT | Dense Smoke Advisory | REV | 35 hr |
| Sep 10, 6:26 PM PDT | Areal Flood Advisory | REV | 49 min |
| Sep 11, 1:41 PM PDT | Fire Weather Watch | REV | 62 hr |
| Sep 14, 3:19 AM PDT | Red Flag Warning | REV | 63 hr |
| Sep 27, 9:38 AM PDT | Freeze Watch | REV | 27 hr |
| Sep 27, 9:38 AM PDT | Freeze Watch | REV | 71 hr |
| Sep 27, 9:38 AM PDT | Freeze Watch | REV | 53 hr |
| Sep 27, 3:03 PM PDT | Winter Storm Watch | REV | 21 hr |
| Sep 28, 12:09 PM PDT | Winter Weather Advisory | REV | 46 hr |
| Sep 28, 12:22 PM PDT | Freeze Warning | REV | 21 hr |
| Nov 22, 1:12 PM PST | Winter Storm Watch | REV | 49 hr |
| Nov 24, 2:00 PM PST | Winter Storm Warning | REV | 4 days |
| Nov 27, 12:53 PM PST | Winter Storm Watch | REV | 51 hr |
| Nov 29, 3:44 PM PST | Winter Storm Warning | REV | 66 hr |
| Dec 3, 2:26 PM PST | Winter Storm Watch | REV | 48 hr |
| Dec 5, 2:45 PM PST | Winter Storm Warning | REV | 67 hr |
| Dec 14, 2:29 PM PST | Winter Weather Advisory | REV | 13 hr |
| Dec 20, 6:46 PM PST | Wind Advisory | REV | 45 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 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 8 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 10 |
| Winter Storm Watch | 12 |
| Winter Weather Advisory | 9 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Lake Wind Advisory | 3 |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 3 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Smoke Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.