Alert archive / California / Sierra County

Weather alerts in Sierra County, California, 2025

102 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sierra County and its neighbors

Each county as a circle sized by its count in 2025. Tap one for its archive.

Alerts: 102
Warnings: 23
Watches: 16
Advisories: 32
Busiest month: August29 alerts
Busiest day: August 27, 20258 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Sierra County, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	0			0
Severe thunderstorm warnings	12	0	100%	0
Flash flood warnings	4	1	75%	1	0%

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	3	0	100%	3	0%
NWS Sacramento, CA: severe thunderstorm warnings	16	1	94%	3	33%	0 min
NWS Sacramento, CA: flash flood warnings	5	2	60%	34	12%	37 min
NWS Reno, NV: severe thunderstorm warnings	37	3	92%	25	12%	12 min
NWS Reno, NV: flash flood warnings	14	6	57%	32	22%	50 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 2, 10:52 AM PST	Winter Weather Advisory	REV	35 hr
Jan 30, 1:46 PM PST	Winter Storm Watch	REV	62 hr
Jan 30, 1:46 PM PST	Winter Weather Advisory	REV	62 hr
Jan 31, 1:57 PM PST	Flood Watch	REV	46 hr
Feb 2, 4:35 AM PST	Winter Storm Watch	REV	9 hr
Feb 2, 12:14 PM PST	Areal Flood Advisory	REV	24 hr
Feb 2, 1:58 PM PST	Winter Storm Warning	REV	64 hr
Feb 3, 2:51 PM PST	Winter Storm Watch	REV	47 hr
Feb 3, 11:49 PM PST	Areal Flood Advisory	STO	12 hr
Feb 4, 1:04 PM PST	Areal Flood Advisory	STO	14 hr
Feb 5, 1:36 PM PST	Winter Storm Warning	REV	44 hr
Feb 10, 1:05 PM PST	Winter Storm Watch	REV	24 hr
Feb 11, 1:03 PM PST	Winter Storm Warning	REV	3 days
Mar 3, 12:25 PM PST	Winter Weather Advisory	REV	3 days
Mar 9, 12:53 PM PDT	Winter Storm Watch	REV	25 hr
Mar 10, 2:00 PM PDT	Winter Storm Warning	REV	72 hr
Mar 12, 7:03 PM PDT	Mesoscale Discussion	SPC	4 hr
Mar 13, 1:57 PM PDT	Winter Weather Advisory	REV	33 hr
Mar 14, 2:05 PM PDT	Winter Storm Watch	REV	13 hr
Mar 15, 3:28 AM PDT	Winter Storm Warning	REV	68 hr
Mar 25, 2:06 PM PDT	High Wind Watch	REV	24 hr
Mar 26, 2:03 PM PDT	Wind Advisory	REV	30 hr
Mar 29, 2:44 AM PDT	Winter Storm Watch	REV	11 hr
Mar 29, 2:07 PM PDT	Winter Storm Warning	REV	3 days
Mar 30, 1:57 PM PDT	Winter Weather Advisory	REV	12 hr
May 10, 12:57 PM PDT	Wind Advisory	REV	55 hr
Jun 1, 12:40 AM PDT	Lake Wind Advisory	REV	20 hr
Jun 5, 7:38 PM PDT	Areal Flood Advisory	REV	97 min
Jun 6, 5:56 PM PDT	Areal Flood Advisory	REV	17 min
Jun 6, 6:13 PM PDT	Flash Flood Warning	REV	34 min
Jun 6, 6:33 PM PDT	Special Weather Statement	REV	27 min
Jun 6, 7:02 PM PDT	Special Weather Statement	REV	28 min
Jun 7, 6:31 PM PDT	Special Weather Statement	REV	29 min
Jun 9, 3:03 PM PDT	Special Weather Statement	STO	27 min
Jun 18, 12:38 PM PDT	Wind Advisory	REV	58 hr
Jul 1, 2:16 PM PDT	Special Weather Statement	REV	29 min
Jul 1, 4:23 PM PDT	Areal Flood Advisory	REV	112 min
Jul 10, 1:16 PM PDT	Heat Advisory	REV	6 days
Jul 20, 1:46 AM PDT	Lake Wind Advisory	REV	45 hr
Jul 23, 5:06 PM PDT	Special Weather Statement	REV	24 min
Jul 23, 5:30 PM PDT	Special Weather Statement	REV	30 min
Jul 24, 4:31 PM PDT	Special Weather Statement	REV	29 min
Jul 25, 2:23 PM PDT	Special Weather Statement	REV	37 min
Jul 25, 2:35 PM PDT	Severe Thunderstorm Warning	REV	25 min
Jul 25, 2:57 PM PDT	Mesoscale Discussion	SPC	2 hr
Jul 25, 3:40 PM PDT	Special Weather Statement	STO	35 min
Jul 26, 3:16 PM PDT	Special Weather Statement	REV	29 min
Jul 26, 3:25 PM PDT	Special Weather Statement	REV	35 min
Jul 26, 3:45 PM PDT	Special Weather Statement	REV	30 min
Jul 27, 5:11 PM PDT	Special Weather Statement	REV	34 min
Jul 27, 8:48 PM PDT	Severe Thunderstorm Warning	REV	8 min
Jul 29, 4:05 PM PDT	Special Weather Statement	REV	25 min
Jul 30, 7:16 PM PDT	Special Weather Statement	REV	29 min
Aug 10, 10:26 AM PDT	Heat Advisory	REV	71 hr
Aug 12, 3:41 PM PDT	Severe Thunderstorm Warning	REV	18 min
Aug 20, 3:17 AM PDT	Heat Advisory	REV	4 days
Aug 23, 2:23 PM PDT	Severe Thunderstorm Warning	REV	37 min
Aug 23, 2:30 PM PDT	Flash Flood Warning	REV	2 hr
Aug 23, 3:05 PM PDT	Severe Thunderstorm Warning	REV	27 min
Aug 24, 12:40 PM PDT	Special Weather Statement	REV	35 min
Aug 24, 1:51 PM PDT	Special Weather Statement	REV	24 min
Aug 24, 2:17 PM PDT	Special Weather Statement	REV	28 min
Aug 24, 2:37 PM PDT	Severe Thunderstorm Warning	REV	23 min
Aug 24, 3:06 PM PDT	Severe Thunderstorm Warning	REV	24 min
Aug 24, 3:13 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 25, 1:01 AM PDT	Flood Watch	REV	20 hr
Aug 25, 1:31 PM PDT	Special Weather Statement	REV	29 min
Aug 25, 2:06 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 25, 2:28 PM PDT	Special Weather Statement	REV	32 min
Aug 25, 2:36 PM PDT	Special Weather Statement	REV	24 min
Aug 25, 2:40 PM PDT	Special Weather Statement	REV	35 min
Aug 25, 3:13 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 26, 1:48 AM PDT	Flood Watch	REV	19 hr
Aug 26, 2:30 PM PDT	Flash Flood Warning	REV	3 hr
Aug 27, 12:45 AM PDT	Flood Watch	REV	21 hr
Aug 27, 11:55 AM PDT	Special Weather Statement	REV	50 min
Aug 27, 12:11 PM PDT	Special Weather Statement	REV	34 min
Aug 27, 12:45 PM PDT	Special Weather Statement	REV	30 min
Aug 27, 1:53 PM PDT	Severe Thunderstorm Warning	REV	37 min
Aug 27, 2:14 PM PDT	Severe Thunderstorm Warning	REV	31 min
Aug 27, 2:37 PM PDT	Flash Flood Warning	REV	113 min
Aug 27, 2:52 PM PDT	Areal Flood Advisory	REV	113 min
Sep 2, 3:33 PM PDT	Severe Thunderstorm Warning	STO	27 min
Sep 2, 4:05 PM PDT	Special Weather Statement	REV	25 min
Sep 2, 4:22 PM PDT	Severe Thunderstorm Warning	STO	23 min
Sep 3, 3:13 AM PDT	Special Weather Statement	STO	32 min
Sep 10, 3:38 PM PDT	Special Weather Statement	REV	22 min
Oct 23, 1:46 PM PDT	Wind Advisory	REV	57 hr
Oct 25, 3:10 AM PDT	Wind Advisory	REV	46 hr
Nov 4, 12:27 AM PST	Wind Advisory	REV	46 hr
Nov 10, 2:06 PM PST	Winter Storm Watch	REV	23 hr
Nov 11, 12:38 PM PST	Winter Weather Advisory	REV	71 hr
Dec 16, 2:15 AM PST	Wind Advisory	REV	38 hr
Dec 17, 10:30 PM PST	Wind Advisory	REV	45 hr
Dec 19, 12:59 PM PST	Flood Watch	REV	3 days
Dec 20, 1:39 PM PST	Wind Advisory	REV	35 hr
Dec 21, 2:39 AM PST	Winter Storm Watch	REV	34 hr
Dec 21, 5:54 AM PST	Areal Flood Advisory	STO	30 hr
Dec 22, 12:58 PM PST	Winter Storm Warning	REV	5 days
Dec 23, 1:10 AM PST	Flood Watch	REV	39 hr
Dec 25, 4:16 AM PST	Areal Flood Advisory	STO	38 hr
Dec 25, 5:08 AM PST	Severe Thunderstorm Warning Considerable damage threat	STO	37 min

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	12
Mesoscale Discussion	2
Special Weather Statement	29
Flooding
Flash Flood Warning	4
Flood Watch	6
Areal Flood Advisory	12
Winter
Winter Storm Warning	7
Winter Storm Watch	9
Winter Weather Advisory	6
Heat
Heat Advisory	3
Wind and dust
High Wind Watch	1
Lake Wind Advisory	2
Wind Advisory	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 2024 2026

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.