Alert archive / California / Sierra County

Weather alerts in Sierra County, California, 2023

65 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts: 65
Warnings: 9
Watches: 17
Advisories: 26
Busiest month: March16 alerts
Busiest day: January 9, 20233 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, 2023

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

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	3	1	67%	4	25%	27 min
NWS Sacramento, CA: severe thunderstorm warnings	24	6	75%	39	56%	18 min
NWS Sacramento, CA: flash flood warnings	8	4	50%	24	33%	38 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, 1:11 PM PST	Winter Storm Watch	REV	14 hr
Jan 3, 3:12 AM PST	Winter Storm Warning	REV	70 hr
Jan 5, 12:31 AM PST	Areal Flood Advisory	STO	21 hr
Jan 6, 2:37 AM PST	Winter Storm Watch	REV	34 hr
Jan 6, 2:37 AM PST	Winter Storm Warning	REV	5 days
Jan 9, 3:31 AM PST	Areal Flood Advisory	STO	14 hr
Jan 9, 8:39 AM PST	Areal Flood Advisory	REV	5 hr
Jan 9, 1:20 PM PST	Areal Flood Advisory	REV	3 hr
Jan 11, 3:42 AM PST	Winter Weather Advisory	REV	22 hr
Jan 11, 3:07 PM PST	Winter Storm Watch	REV	24 hr
Jan 12, 3:08 PM PST	Winter Storm Warning	REV	4 days
Jan 14, 10:54 AM PST	Special Weather Statement	STO	51 min
Jan 15, 2:25 PM PST	Winter Weather Advisory	REV	32 hr
Jan 17, 1:09 PM PST	Winter Weather Advisory	REV	42 hr
Jan 27, 2:57 PM PST	Winter Weather Advisory	REV	52 hr
Feb 3, 1:34 PM PST	Winter Weather Advisory	REV	53 hr
Feb 19, 2:10 PM PST	Wind Advisory	REV	53 hr
Feb 22, 4:21 AM PST	Winter Weather Advisory	REV	3 days
Feb 25, 4:19 PM PST	Winter Storm Warning	REV	3 days
Mar 1, 2:35 PM PST	Winter Storm Watch	REV	23 hr
Mar 2, 1:36 PM PST	Winter Storm Warning	REV	4 days
Mar 7, 10:43 AM PST	Winter Weather Advisory	REV	26 hr
Mar 7, 1:12 PM PST	Flood Watch	REV	48 hr
Mar 7, 1:37 PM PST	Winter Storm Watch	REV	26 hr
Mar 8, 3:11 PM PST	Winter Storm Warning	REV	6 days
Mar 9, 1:00 PM PST	Areal Flood Advisory	REV	3 days
Mar 10, 2:00 AM PST	Areal Flood Advisory	STO	12 hr
Mar 12, 1:20 PM PDT	Flood Watch	REV	24 hr
Mar 13, 1:25 PM PDT	Areal Flood Advisory	REV	24 hr
Mar 14, 4:45 AM PDT	Areal Flood Advisory	STO	7 hr
Mar 14, 11:50 AM PDT	Areal Flood Advisory	STO	24 hr
Mar 17, 1:58 PM PDT	Winter Storm Watch	REV	3 days
Mar 18, 1:24 PM PDT	Winter Weather Advisory	REV	46 hr
Mar 24, 2:11 PM PDT	Winter Storm Watch	REV	48 hr
Mar 26, 2:03 PM PDT	Winter Storm Warning	REV	63 hr
Apr 1, 3:05 PM PDT	Winter Weather Advisory	REV	44 hr
Apr 13, 1:36 PM PDT	Flood Watch	REV	14 min
Apr 13, 1:50 PM PDT	Flood Watch	REV	3 days
Apr 16, 1:58 PM PDT	Wind Advisory	REV	45 hr
Apr 24, 2:36 PM PDT	Flood Watch	REV	6 days
May 9, 7:38 PM PDT	Special Weather Statement	REV	22 min
May 25, 7:53 AM PDT	Flood Watch	REV	14 hr
May 25, 3:02 PM PDT	Special Weather Statement	STO	58 min
May 25, 3:20 PM PDT	Special Weather Statement	STO	40 min
May 28, 8:27 AM PDT	Flood Watch	REV	58 hr
Jun 5, 3:21 PM PDT	Special Weather Statement	REV	24 min
Jun 6, 12:12 PM PDT	Mesoscale Discussion	SPC	2 hr
Jun 8, 2:08 PM PDT	Special Weather Statement	REV	22 min
Jun 10, 1:39 PM PDT	Special Weather Statement	STO	51 min
Jun 10, 1:44 PM PDT	Severe Thunderstorm Warning	STO	46 min
Jun 10, 3:27 PM PDT	Areal Flood Advisory	STO	6 hr
Jun 11, 1:13 AM PDT	Flood Watch	REV	44 hr
Jun 11, 4:12 PM PDT	Special Weather Statement	STO	33 min
Jun 16, 1:19 PM PDT	Lake Wind Advisory	REV	3 days
Jul 10, 2:40 AM PDT	Excessive Heat Watch	REV	48 hr
Jul 12, 2:42 AM PDT	Heat Advisory	REV	5 days
Aug 17, 1:39 PM PDT	Special Weather Statement	REV	36 min
Aug 18, 3:40 PM PDT	Special Weather Statement	STO	50 min
Sep 18, 2:27 PM PDT	Special Weather Statement	REV	48 min
Sep 18, 3:18 PM PDT	Special Weather Statement	REV	42 min
Oct 9, 1:54 PM PDT	Freeze Watch	REV	66 hr
Oct 11, 1:35 PM PDT	Freeze Warning	REV	18 hr
Dec 6, 3:09 AM PST	Winter Weather Advisory	REV	40 hr
Dec 17, 3:22 PM PST	Winter Weather Advisory	REV	21 hr
Dec 22, 4:17 PM PST	Freezing Fog Advisory	REV	8 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	12
Flooding
Flood Watch	8
Areal Flood Advisory	10
Winter
Winter Storm Warning	7
Winter Storm Watch	7
Winter Weather Advisory	11
Heat
Excessive Heat Watch	1
Heat Advisory	1
Cold
Freeze Warning	1
Freeze Watch	1
Wind and dust
Lake Wind Advisory	1
Wind Advisory	2
Fog and smoke
Freezing Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.