Alert archive / California / Placer County

Weather alerts in Placer County, California, 2024

100 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Placer County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 100
Warnings: 21
Watches: 10
Advisories: 65
Busiest month: February17 alerts
Busiest day: February 20, 20244 alerts

Over time

By month

Warning verification

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

Placer County, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	0			0
Severe thunderstorm warnings	3	0	100%	1	0%
Flash flood warnings	0			1	0%

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	1	0	100%	0
NWS Sacramento, CA: severe thunderstorm warnings	10	0	100%	1	0%
NWS Sacramento, CA: flash flood warnings	9	1	89%	19	5%	96 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, 1:57 PM PST	Winter Weather Advisory	REV	47 hr
Jan 2, 7:26 PM PST	Mesoscale Discussion	SPC	5 hr
Jan 3, 1:22 PM PST	Winter Storm Watch	REV	24 hr
Jan 4, 1:07 PM PST	Winter Storm Warning	REV	58 hr
Jan 8, 1:33 PM PST	Lake Wind Advisory	REV	37 hr
Jan 8, 1:33 PM PST	Winter Storm Warning	REV	61 hr
Jan 11, 2:28 AM PST	Winter Storm Watch	REV	15 hr
Jan 11, 5:57 PM PST	Winter Storm Warning	REV	58 hr
Jan 16, 1:56 PM PST	Lake Wind Advisory	REV	20 hr
Jan 18, 1:28 PM PST	Winter Storm Watch	REV	48 hr
Jan 18, 1:28 PM PST	Winter Weather Advisory	REV	4 days
Jan 22, 4:40 AM PST	Areal Flood Advisory	STO	6 hr
Jan 29, 1:16 PM PST	Winter Storm Watch	REV	24 hr
Jan 30, 1:27 PM PST	Winter Storm Warning	REV	69 hr
Feb 2, 2:43 PM PST	Winter Storm Warning	REV	67 hr
Feb 4, 10:07 AM PST	Areal Flood Advisory	STO	15 hr
Feb 5, 1:01 AM PST	Areal Flood Advisory	STO	8 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 18, 10:36 PM PST	Areal Flood Advisory	STO	9 hr
Feb 19, 5:10 PM PST	Special Weather Statement	STO	50 min
Feb 19, 5:37 PM PST	Severe Thunderstorm Warning	STO	24 min
Feb 19, 5:58 PM PST	Severe Thunderstorm Warning	STO	47 min
Feb 20, 2:09 AM PST	Winter Weather Advisory	REV	32 hr
Feb 24, 12:48 PM PST	Winter Weather Advisory	REV	49 hr
Feb 24, 4:57 PM PST	Lake Wind Advisory	REV	59 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 2, 2:57 PM PST	Special Weather Statement	STO	48 min
Mar 3, 9:14 AM PST	Winter Storm Warning	REV	19 hr
Mar 9, 7:38 AM PST	Lake Wind Advisory	REV	35 hr
Mar 11, 12:31 PM PDT	Lake Wind Advisory	REV	31 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 13, 1:44 PM PDT	Lake Wind Advisory	REV	51 hr
Mar 21, 1:07 PM PDT	Winter Weather Advisory	REV	46 hr
Mar 23, 7:54 PM PDT	Winter Weather Advisory	REV	15 hr
Mar 26, 1:51 AM PDT	Winter Weather Advisory	REV	57 hr
Mar 28, 3:03 AM PDT	Lake Wind Advisory	REV	17 hr
Mar 28, 2:16 PM PDT	Winter Storm Warning	REV	67 hr
Apr 2, 2:14 PM PDT	Lake Wind Advisory	REV	45 hr
Apr 11, 2:08 PM PDT	Lake Wind Advisory	REV	34 hr
May 2, 12:18 PM PDT	Winter Weather Advisory	REV	63 hr
May 3, 1:47 PM PDT	Winter Storm Warning	REV	42 hr
May 7, 2:00 PM PDT	Lake Wind Advisory	REV	39 hr
Jun 2, 1:02 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 13, 12:53 PM PDT	Lake Wind Advisory	REV	33 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 13, 4:29 PM PDT	Severe Thunderstorm Warning	STO	46 min
Jul 15, 1:50 PM PDT	Special Weather Statement	STO	40 min
Aug 3, 2:21 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 11, 1:03 PM PDT	Lake Wind Advisory	REV	32 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 16, 1:38 PM PDT	Lake Wind Advisory	REV	30 hr
Aug 21, 1:54 PM PDT	Lake Wind Advisory	REV	51 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
Sep 10, 1:40 AM PDT	Lake Wind Advisory	REV	42 hr
Sep 14, 12:55 PM PDT	Lake Wind Advisory	REV	31 hr
Oct 3, 9:28 AM PDT	Lake Wind Advisory	REV	35 hr
Oct 17, 1:23 AM PDT	Dense Fog Advisory	REV	7 hr
Oct 22, 12:48 PM PDT	Lake Wind Advisory	REV	31 hr
Oct 26, 2:43 AM PDT	Lake Wind Advisory	REV	44 hr
Oct 29, 7:43 AM PDT	Winter Weather Advisory	REV	3 hr
Oct 30, 2:21 AM PDT	Winter Weather Advisory	REV	33 hr
Oct 30, 12:29 PM PDT	Lake Wind Advisory	REV	23 hr
Oct 31, 12:07 PM PDT	Winter Weather Advisory	REV	45 hr
Nov 4, 1:09 PM PST	Lake Wind Advisory	REV	45 hr
Nov 10, 12:45 AM PST	Winter Weather Advisory	REV	45 hr
Nov 10, 1:27 AM PST	Lake Wind Advisory	REV	42 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 17, 4:30 AM PST	Lake Wind Advisory	REV	28 hr
Nov 18, 11:09 PM PST	Lake Wind Advisory	REV	44 hr
Nov 20, 7:23 PM PST	Lake Wind Advisory	REV	9 hr
Nov 21, 3:25 AM PST	Winter Storm Warning	REV	67 hr
Nov 21, 1:55 PM PST	Lake Wind Advisory	REV	50 hr
Nov 22, 1:47 AM PST	Wind Advisory	REV	8 hr
Nov 22, 3:48 AM PST	Winter Storm Watch	REV	49 hr
Nov 22, 11:35 AM PST	Areal Flood Advisory	STO	12 hr
Nov 24, 4:25 AM PST	Winter Storm Warning	REV	60 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 14, 6:18 AM PST	Areal Flood Advisory	STO	6 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, 5:12 PM PST	Lake Wind Advisory	REV	24 hr
Dec 27, 2:42 PM PST	High Wind Watch	REV	11 hr
Dec 28, 1:43 AM PST	Winter Weather Advisory	REV	42 hr
Dec 28, 2:10 AM PST	Lake Wind Advisory	REV	10 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
Mesoscale Discussion	1
Special Weather Statement	3
Flooding
Areal Flood Advisory	7
Winter
Blizzard Warning	1
Winter Storm Warning	12
Winter Storm Watch	7
Winter Weather Advisory	23
Heat
Heat Advisory	1
Wind and dust
High Wind Warning	1
High Wind Watch	2
Lake Wind Advisory	30
Wind Advisory	3
Fire
Red Flag Warning	4
Fire Weather Watch	1
Fog and smoke
Dense 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 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.