Alert archive / California / Lassen County

Weather alerts in Lassen County, California, 2022

71 weather alerts in 2022, 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 2022. Tap one for its archive.

Alerts: 71
Warnings: 23
Watches: 14
Advisories: 33
Busiest month: December14 alerts
Busiest day: June 26, 20223 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, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	3	1	67%	1	100%	6 min
Flash flood warnings	5	0	100%	0

Each office's whole area, 2022

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	2	0	100%	3	0%
NWS Sacramento, CA: severe thunderstorm warnings	1	0	100%	0
NWS Sacramento, CA: flash flood warnings	5	0	100%	5	0%
NWS Reno, NV: severe thunderstorm warnings	9	1	89%	6	17%	6 min
NWS Reno, NV: flash flood warnings	9	1	89%	11	27%	73 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 1, 1:09 PM PST	High Wind Watch	REV	25 hr
Jan 2, 1:42 PM PST	High Wind Warning	REV	41 hr
Jan 17, 1:25 PM PST	Freezing Fog Advisory	REV	21 hr
Feb 21, 2:49 AM PST	Winter Weather Advisory	REV	31 hr
Mar 2, 1:48 PM PST	Winter Weather Advisory	REV	71 hr
Mar 11, 1:55 PM PST	Wind Advisory	REV	48 hr
Apr 3, 3:54 AM PDT	Wind Advisory	REV	42 hr
Apr 9, 1:26 PM PDT	Winter Weather Advisory	REV	55 hr
Apr 13, 2:17 PM PDT	Winter Weather Advisory	REV	33 hr
Apr 15, 3:13 AM PDT	Winter Weather Advisory	REV	33 hr
Apr 17, 2:53 PM PDT	Wind Advisory	REV	50 hr
Apr 19, 3:31 PM PDT	Winter Storm Warning	REV	65 hr
Apr 30, 8:23 AM PDT	Wind Advisory	REV	60 hr
May 4, 1:37 PM PDT	Wind Advisory	REV	60 hr
May 5, 3:06 PM PDT	High Wind Warning	REV	35 hr
May 25, 2:26 AM PDT	Lake Wind Advisory	REV	43 hr
May 26, 2:01 PM PDT	Lake Wind Advisory	REV	32 hr
May 27, 1:47 PM PDT	Wind Advisory	REV	33 hr
Jun 4, 8:09 AM PDT	Lake Wind Advisory	REV	39 hr
Jun 7, 1:40 PM PDT	Heat Advisory	REV	3 days
Jun 11, 1:03 AM PDT	Wind Advisory	REV	43 hr
Jun 12, 5:12 PM PDT	Flash Flood Warning Considerable damage threat	STO	6 hr
Jun 15, 3:24 PM PDT	Lake Wind Advisory	REV	54 hr
Jun 23, 1:27 PM PDT	Areal Flood Advisory	REV	58 min
Jun 25, 5:05 PM PDT	Flash Flood Warning Considerable damage threat	STO	4 hr
Jun 25, 5:35 PM PDT	Flash Flood Warning Considerable damage threat	STO	3 hr
Jun 25, 5:44 PM PDT	Flash Flood Warning	REV	3 hr
Jul 1, 2:59 PM PDT	Lake Wind Advisory	REV	29 hr
Jul 16, 10:24 AM PDT	Red Flag Warning	REV	34 hr
Jul 17, 3:11 AM PDT	Lake Wind Advisory	REV	17 hr
Jul 26, 9:34 AM PDT	Heat Advisory	REV	5 days
Jul 30, 4:32 PM PDT	Flash Flood Warning Considerable damage threat	STO	5 hr
Jul 31, 3:28 PM PDT	Areal Flood Advisory	REV	3 hr
Jul 31, 4:36 PM PDT	Severe Thunderstorm Warning	REV	39 min
Jul 31, 5:19 PM PDT	Severe Thunderstorm Warning	REV	41 min
Jul 31, 6:01 PM PDT	Severe Thunderstorm Warning	REV	44 min
Aug 4, 6:31 PM PDT	Areal Flood Advisory	REV	2 hr
Aug 4, 7:48 PM PDT	Dust Storm Advisory	REV	84 min
Aug 15, 3:11 PM PDT	Fire Weather Watch	REV	23 hr
Aug 16, 2:31 PM PDT	Red Flag Warning	REV	36 hr
Aug 18, 3:28 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 24, 1:32 PM PDT	Fire Weather Watch	REV	59 hr
Aug 30, 1:29 PM PDT	Excessive Heat Watch	REV	24 hr
Aug 31, 1:02 PM PDT	Heat Advisory	REV	7 days
Sep 2, 10:22 AM PDT	Red Flag Warning	REV	34 hr
Sep 4, 2:42 AM PDT	Red Flag Warning	REV	17 hr
Sep 12, 7:21 PM PDT	Special Weather Statement	REV	39 min
Sep 12, 8:13 PM PDT	Areal Flood Advisory	REV	2 hr
Sep 27, 9:56 AM PDT	Red Flag Warning	REV	34 hr
Oct 20, 12:53 AM PDT	Freeze Watch	REV	36 hr
Oct 21, 12:55 PM PDT	Freeze Warning	REV	43 hr
Oct 30, 1:51 PM PDT	Winter Storm Watch	REV	20 hr
Oct 31, 10:14 AM PDT	Winter Weather Advisory	REV	62 hr
Nov 3, 12:52 PM PDT	Winter Storm Watch	REV	24 hr
Nov 4, 12:49 PM PDT	Winter Storm Warning	REV	5 days
Nov 28, 12:53 PM PST	Winter Storm Watch	REV	25 hr
Nov 29, 2:03 PM PST	Winter Storm Warning	REV	62 hr
Dec 1, 1:47 PM PST	Winter Storm Watch	REV	24 hr
Dec 2, 1:53 PM PST	Winter Weather Advisory	REV	4 days
Dec 7, 12:41 PM PST	Winter Storm Watch	REV	23 hr
Dec 8, 11:55 AM PST	Winter Storm Warning	REV	4 days
Dec 24, 1:30 PM PST	High Wind Watch	REV	24 hr
Dec 24, 6:24 PM PST	Freezing Fog Advisory	REV	7 hr
Dec 25, 4:08 AM PST	Winter Storm Watch	REV	24 hr
Dec 25, 1:31 PM PST	High Wind Warning	REV	44 hr
Dec 26, 3:44 AM PST	Winter Weather Advisory	REV	42 hr
Dec 28, 9:29 AM PST	Flood Watch	REV	56 hr
Dec 28, 11:40 AM PST	Winter Storm Watch	REV	27 hr
Dec 29, 2:17 PM PST	Winter Storm Warning	REV	68 hr
Dec 30, 10:22 AM PST	River Flood Warning	REV	52 hr
Dec 30, 5:09 PM PST	Areal Flood Advisory	REV	24 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	3
Special Weather Statement	1
Flooding
Flash Flood Warning	5
River Flood Warning	1
Flood Watch	1
Areal Flood Advisory	6
Winter
Winter Storm Warning	5
Winter Storm Watch	7
Winter Weather Advisory	8
Heat
Excessive Heat Watch	1
Heat Advisory	3
Cold
Freeze Warning	1
Freeze Watch	1
Wind and dust
High Wind Warning	3
High Wind Watch	2
Dust Storm Advisory	1
Lake Wind Advisory	6
Wind Advisory	7
Fire
Red Flag Warning	5
Fire Weather Watch	2
Fog and smoke
Freezing Fog Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2021 2023

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.