Alert archive / California / Lassen County

Weather alerts in Lassen County, California, 2024

86 weather alerts in 2024, 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 2024. Tap one for its archive.

Alerts: 86
Warnings: 17
Watches: 15
Advisories: 49
Busiest month: December14 alerts
Busiest day: June 9, 20243 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, 2024

	Warnings	With a report	False alarm ratio
Tornado warnings	0
Severe thunderstorm warnings	1	0	100%
Flash flood warnings	0

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Reno, NV: severe thunderstorm warnings	7	0	100%	13	0%
NWS Reno, NV: flash flood warnings	10	0	100%	7	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 3, 1:22 PM PST	Winter Storm Watch	REV	24 hr
Jan 4, 1:07 PM PST	Winter Weather Advisory	REV	56 hr
Jan 8, 1:33 PM PST	Wind Advisory	REV	37 hr
Jan 8, 1:33 PM PST	Winter Weather Advisory	REV	61 hr
Jan 11, 2:28 AM PST	Winter Storm Watch	REV	15 hr
Jan 11, 5:57 PM PST	Winter Weather Advisory	REV	58 hr
Jan 15, 11:25 AM PST	Freezing Fog Advisory	REV	26 hr
Jan 29, 1:16 PM PST	Winter Storm Watch	REV	24 hr
Jan 30, 1:27 PM PST	Winter Weather Advisory	REV	69 hr
Feb 2, 2:43 PM PST	Winter Storm Warning	REV	67 hr
Feb 5, 10:22 AM PST	Winter Weather Advisory	REV	27 hr
Feb 13, 1:32 PM PST	Winter Weather Advisory	REV	44 hr
Feb 15, 1:44 PM PST	Winter Storm Watch	REV	23 hr
Feb 15, 1:44 PM PST	Winter Weather Advisory	REV	62 hr
Feb 16, 12:16 PM PST	Winter Storm Warning	REV	4 days
Feb 20, 2:09 AM PST	Winter Weather Advisory	REV	32 hr
Feb 24, 1:17 PM PST	Wind Advisory	REV	63 hr
Feb 26, 1:48 PM PST	Winter Storm Watch	REV	48 hr
Feb 27, 12:18 PM PST	Blizzard Warning	REV	6 days
Mar 3, 4:18 AM PST	Winter Weather Advisory	REV	24 hr
Mar 12, 9:48 AM PDT	High Wind Watch	REV	17 hr
Mar 13, 2:23 AM PDT	High Wind Warning	REV	35 hr
Mar 21, 1:07 PM PDT	Winter Weather Advisory	REV	46 hr
Mar 28, 2:42 PM PDT	Winter Weather Advisory	REV	67 hr
Apr 4, 2:46 AM PDT	Winter Storm Warning	REV	31 hr
Apr 12, 11:53 AM PDT	Mesoscale Discussion	SPC	97 min
Apr 13, 2:16 AM PDT	Winter Weather Advisory	REV	31 hr
May 2, 12:18 PM PDT	Winter Weather Advisory	REV	63 hr
Jun 6, 6:29 PM PDT	Special Weather Statement	REV	31 min
Jun 6, 6:57 PM PDT	Severe Thunderstorm Warning	REV	23 min
Jun 9, 2:19 PM PDT	Special Weather Statement	REV	26 min
Jun 9, 3:10 PM PDT	Special Weather Statement	REV	35 min
Jun 9, 4:40 PM PDT	Special Weather Statement	REV	35 min
Jun 13, 12:53 PM PDT	Lake Wind Advisory	REV	33 hr
Jun 24, 11:29 AM PDT	Fire Weather Watch	REV	25 hr
Jun 25, 12:29 PM PDT	Red Flag Warning	REV	35 hr
Jul 3, 8:02 AM PDT	Heat Advisory	REV	10 days
Jul 12, 1:34 PM PDT	Red Flag Warning	REV	54 hr
Jul 23, 1:02 PM PDT	Fire Weather Watch	REV	22 hr
Jul 24, 11:01 AM PDT	Red Flag Warning	REV	34 hr
Jul 28, 8:12 PM PDT	Dense Smoke Advisory	REV	11 hr
Jul 29, 9:51 AM PDT	Dense Smoke Advisory	REV	3 days
Aug 10, 1:02 PM PDT	Fire Weather Watch	REV	24 hr
Aug 11, 1:21 PM PDT	Red Flag Warning	REV	31 hr
Aug 14, 11:09 AM PDT	Fire Weather Watch	REV	50 hr
Aug 16, 1:37 PM PDT	Red Flag Warning	REV	33 hr
Aug 20, 2:50 PM PDT	Fire Weather Watch	REV	22 hr
Aug 21, 12:40 PM PDT	Red Flag Warning	REV	33 hr
Aug 21, 1:54 PM PDT	Lake Wind Advisory	REV	51 hr
Aug 30, 1:43 PM PDT	Fire Weather Watch	REV	47 hr
Sep 1, 12:36 PM PDT	Lake Wind Advisory	REV	31 hr
Sep 1, 12:56 PM PDT	Red Flag Warning	REV	31 hr
Oct 2, 1:05 PM PDT	Fire Weather Watch	REV	20 hr
Oct 3, 9:10 AM PDT	Red Flag Warning	REV	35 hr
Oct 14, 12:07 PM PDT	Freeze Watch	REV	50 hr
Oct 16, 2:30 PM PDT	Freeze Warning	REV	43 hr
Oct 17, 1:23 AM PDT	Dense Fog Advisory	REV	7 hr
Oct 30, 2:21 AM PDT	Winter Weather Advisory	REV	33 hr
Oct 31, 12:07 PM PDT	Winter Weather Advisory	REV	45 hr
Nov 12, 1:42 AM PST	Wind Advisory	REV	41 hr
Nov 12, 1:16 PM PST	Winter Weather Advisory	REV	12 hr
Nov 13, 1:48 AM PST	Winter Weather Advisory	REV	21 hr
Nov 14, 12:56 PM PST	Winter Weather Advisory	REV	30 hr
Nov 18, 11:09 PM PST	Winter Weather Advisory	REV	47 hr
Nov 20, 2:18 PM PST	Areal Flood Advisory	REV	67 hr
Nov 21, 3:25 AM PST	Winter Storm Warning	REV	67 hr
Nov 22, 3:48 AM PST	Winter Storm Watch	REV	49 hr
Nov 22, 9:01 AM PST	Areal Flood Advisory	STO	27 hr
Nov 24, 4:25 AM PST	Winter Weather Advisory	REV	54 hr
Nov 29, 12:04 AM PST	Freezing Fog Advisory	REV	11 hr
Nov 29, 7:07 PM PST	Freezing Fog Advisory	REV	16 hr
Nov 30, 12:05 PM PST	Freezing Fog Advisory	REV	23 hr
Dec 2, 12:15 AM PST	Freezing Fog Advisory	REV	11 hr
Dec 2, 8:45 PM PST	Freezing Fog Advisory	REV	14 hr
Dec 3, 2:01 PM PST	Freezing Fog Advisory	REV	21 hr
Dec 4, 12:56 PM PST	Freezing Fog Advisory	REV	22 hr
Dec 5, 7:27 PM PST	Freezing Fog Advisory	REV	13 hr
Dec 6, 9:06 AM PST	Freezing Fog Advisory	REV	25 hr
Dec 10, 2:08 PM PST	Winter Weather Advisory	REV	56 hr
Dec 12, 2:36 PM PST	Winter Storm Warning	REV	55 hr
Dec 15, 2:18 PM PST	Winter Weather Advisory	REV	28 hr
Dec 20, 12:17 PM PST	Wind Advisory	REV	28 hr
Dec 22, 12:05 PM PST	Winter Weather Advisory	REV	55 hr
Dec 25, 2:08 AM PST	Winter Weather Advisory	REV	55 hr
Dec 26, 12:50 PM PST	Wind Advisory	REV	24 hr
Dec 28, 1:43 AM PST	Winter Weather Advisory	REV	42 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
Mesoscale Discussion	1
Special Weather Statement	4
Flooding
Areal Flood Advisory	2
Winter
Blizzard Warning	1
Winter Storm Warning	5
Winter Storm Watch	6
Winter Weather Advisory	25
Heat
Heat Advisory	1
Cold
Freeze Warning	1
Freeze Watch	1
Wind and dust
High Wind Warning	1
High Wind Watch	1
Lake Wind Advisory	3
Wind Advisory	5
Fire
Red Flag Warning	8
Fire Weather Watch	7
Fog and smoke
Dense Fog Advisory	1
Dense Smoke Advisory	2
Freezing Fog Advisory	10

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.