Alert archive / California / Lassen County

Weather alerts in Lassen County, California, 2026

56 weather alerts in 2026, 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 2026. Tap one for its archive.

Alerts: 56
Warnings: 15
Watches: 16
Advisories: 20
Busiest month: June11 alerts
Busiest day: June 19, 20264 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, 2026

	Warnings	With a report	False alarm ratio
Tornado warnings	0
Severe thunderstorm warnings	2	0	100%
Flash flood warnings	0

Each office's whole area, 2026

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Reno, NV: tornado warnings	1	0	100%	0
NWS Reno, NV: severe thunderstorm warnings	22	1	95%	19	5%	16 min
NWS Reno, NV: flash flood warnings	9	4	56%	26	42%	85 min

An office's figures cover every county it serves, including across state lines.

The year is still running; reports filed late and damage surveys can still change these figures.

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
Dec 31, 7:48 PM PST	Flood Watch	REV	68 hr
Jan 2, 12:48 PM PST	Winter Weather Advisory	REV	3 days
Feb 7, 11:07 AM PST	Winter Weather Advisory	REV	4 days
Feb 13, 11:02 AM PST	Winter Storm Watch	REV	25 hr
Feb 14, 11:51 AM PST	Winter Storm Warning	REV	4 days
Feb 17, 1:43 PM PST	Winter Weather Advisory	REV	56 hr
Feb 24, 3:10 PM PST	River Flood Advisory	REV	16 hr
Mar 30, 1:15 PM PDT	High Wind Watch	REV	21 hr
Mar 31, 10:35 AM PDT	High Wind Warning	REV	48 hr
Apr 8, 1:27 PM PDT	Winter Storm Watch	REV	43 hr
Apr 10, 8:21 AM PDT	Winter Weather Advisory	REV	63 hr
Apr 15, 12:06 AM PDT	Freeze Watch	REV	25 hr
Apr 16, 1:28 AM PDT	Freeze Warning	REV	31 hr
Apr 19, 9:11 AM PDT	Winter Storm Watch	STO	24 hr
Apr 19, 12:07 PM PDT	Lake Wind Advisory	REV	34 hr
Apr 20, 8:56 AM PDT	Winter Storm Warning	STO	51 hr
May 4, 1:44 PM PDT	Special Weather Statement	REV	31 min
May 4, 2:18 PM PDT	Special Weather Statement	REV	27 min
May 11, 12:51 PM PDT	Lake Wind Advisory	REV	31 hr
May 15, 10:12 AM PDT	Lake Wind Advisory	REV	67 hr
May 23, 2:25 PM PDT	Fire Weather Watch	REV	23 hr
May 24, 1:05 PM PDT	Red Flag Warning	REV	34 hr
May 24, 2:25 PM PDT	Lake Wind Advisory	REV	63 hr
Jun 4, 11:02 AM PDT	Fire Weather Watch	REV	22 hr
Jun 5, 9:29 AM PDT	Red Flag Warning	REV	37 hr
Jun 7, 9:22 AM PDT	Lake Wind Advisory	REV	38 hr
Jun 16, 2:17 PM PDT	Fire Weather Watch	REV	48 hr
Jun 18, 1:49 PM PDT	Red Flag Warning	REV	33 hr
Jun 19, 2:35 PM PDT	Special Weather Statement	REV	115 min
Jun 19, 3:01 PM PDT	Special Weather Statement	REV	119 min
Jun 19, 3:07 PM PDT	Severe Thunderstorm Warning	REV	23 min
Jun 19, 3:31 PM PDT	Severe Thunderstorm Warning	REV	44 min
Jun 19, 7:01 PM PDT	Special Weather Statement	REV	119 min
Jun 24, 11:45 AM PDT	Lake Wind Advisory	REV	3 days
Jul 9, 9:53 AM PDT	Red Flag Warning	REV	35 hr
Jul 22, 10:36 AM PDT	Fire Weather Watch	REV	24 hr
Jul 23, 10:10 AM PDT	Fire Weather Watch	REV	47 hr
Jul 23, 10:10 AM PDT	Red Flag Warning	REV	59 hr
Jul 25, 9:29 AM PDT	Red Flag Warning	REV	36 hr
Aug 3, 12:01 AM PDT	Heat Advisory	REV	7 days
Aug 3, 12:01 AM PDT	Extreme Heat Watch	REV	35 hr
Aug 6, 9:46 AM PDT	Heat Advisory	STO	4 days
Aug 11, 10:19 AM PDT	Fire Weather Watch	REV	41 hr
Aug 20, 10:52 AM PDT	Fire Weather Watch	REV	21 hr
Aug 21, 7:37 AM PDT	Red Flag Warning	REV	39 hr
Aug 21, 11:22 AM PDT	Lake Wind Advisory	REV	36 hr
Aug 30, 9:19 AM PDT	Fire Weather Watch	REV	26 hr
Aug 31, 11:42 AM PDT	Red Flag Warning	REV	35 hr
Aug 31, 1:21 PM PDT	Lake Wind Advisory	REV	3 days
Sep 4, 2:02 AM PDT	Lake Wind Advisory	REV	19 hr
Sep 5, 1:59 PM PDT	Lake Wind Advisory	REV	33 hr
Sep 10, 11:42 AM PDT	Fire Weather Watch	REV	23 hr
Sep 10, 11:49 AM PDT	Lake Wind Advisory	REV	32 hr
Sep 10, 11:49 AM PDT	Wind Advisory	REV	60 hr
Sep 11, 10:18 AM PDT	Red Flag Warning	REV	38 hr
Sep 24, 12:09 PM PDT	Lake Wind Advisory	REV	32 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
Special Weather Statement	5
Flooding
Flood Watch	1
River Flood Advisory	1
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Winter Weather Advisory	4
Heat
Extreme Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	1
Freeze Watch	1
Wind and dust
High Wind Warning	1
High Wind Watch	1
Lake Wind Advisory	12
Wind Advisory	1
Fire
Red Flag Warning	9
Fire Weather Watch	9

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 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.