Alert archive / California / Placer County

Weather alerts in Placer County, California, 2016

126 weather alerts in 2016, 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 2016. Tap one for its archive.

Alerts: 126
Warnings: 15
Watches: 20
Advisories: 88
Busiest month: December26 alerts
Busiest day: December 16, 20165 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, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	1	1	0%	1	100%	8 min
Flash flood warnings	0			0

Each office's whole area, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	4	0	100%	4	0%
NWS Sacramento, CA: severe thunderstorm warnings	13	4	69%	11	55%	17 min
NWS Sacramento, CA: flash flood warnings	4	1	75%	1	100%	61 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 3, 2:31 PM PST	Winter Storm Watch	REV	13 hr
Jan 4, 3:07 AM PST	Winter Weather Advisory	REV	40 hr
Jan 4, 2:39 PM PST	Winter Storm Watch	REV	23 hr
Jan 5, 5:10 AM PST	Areal Flood Advisory	STO	7 hr
Jan 5, 1:42 PM PST	Winter Weather Advisory	REV	38 hr
Jan 5, 10:01 PM PST	Freezing Fog Advisory	REV	11 hr
Jan 11, 1:42 PM PST	Winter Weather Advisory	REV	56 hr
Jan 12, 9:58 PM PST	Lake Wind Advisory	REV	5 hr
Jan 13, 12:46 PM PST	Winter Weather Advisory	REV	42 hr
Jan 15, 2:26 PM PST	Lake Wind Advisory	REV	29 hr
Jan 16, 1:40 PM PST	Winter Weather Advisory	REV	44 hr
Jan 18, 10:02 AM PST	Lake Wind Advisory	REV	33 hr
Jan 19, 5:10 AM PST	Areal Flood Advisory	STO	11 hr
Jan 21, 2:46 PM PST	Lake Wind Advisory	REV	25 hr
Jan 21, 2:46 PM PST	Winter Weather Advisory	REV	46 hr
Jan 27, 12:46 PM PST	Lake Wind Advisory	REV	26 hr
Jan 28, 2:49 AM PST	Winter Storm Watch	REV	12 hr
Jan 28, 2:59 PM PST	Winter Storm Warning	REV	45 hr
Jan 28, 3:00 PM PST	Wind Advisory	REV	37 hr
Jan 29, 11:47 AM PST	Areal Flood Advisory	REV	35 hr
Jan 29, 2:35 PM PST	Winter Storm Watch	REV	24 hr
Jan 30, 2:14 PM PST	Winter Weather Advisory	REV	36 hr
Feb 15, 1:35 PM PST	Wind Advisory	REV	56 hr
Feb 15, 1:42 PM PST	Winter Storm Watch	REV	20 hr
Feb 16, 3:40 AM PST	High Wind Warning	REV	42 hr
Feb 16, 10:03 AM PST	Winter Storm Warning	REV	50 hr
Feb 17, 6:37 PM PST	Lake Wind Advisory	REV	23 hr
Feb 18, 2:11 PM PST	Lake Wind Advisory	REV	32 hr
Feb 26, 2:58 AM PST	Lake Wind Advisory	REV	22 hr
Feb 29, 2:47 PM PST	Lake Wind Advisory	REV	29 hr
Mar 3, 1:26 PM PST	Flash Flood Watch	STO	62 hr
Mar 3, 1:54 PM PST	Winter Storm Watch	REV	25 hr
Mar 4, 2:53 PM PST	Winter Storm Warning	REV	67 hr
Mar 4, 2:57 PM PST	Wind Advisory	REV	31 hr
Mar 5, 3:25 PM PST	Winter Weather Advisory	REV	53 hr
Mar 5, 5:17 PM PST	Areal Flood Advisory	STO	6 hr
Mar 9, 11:03 AM PST	Lake Wind Advisory	REV	32 hr
Mar 9, 11:03 AM PST	Wind Advisory	REV	32 hr
Mar 9, 2:31 PM PST	Flood Watch	STO	5 days
Mar 10, 10:36 AM PST	Winter Storm Watch	REV	27 hr
Mar 10, 3:22 PM PST	Lake Wind Advisory	REV	27 hr
Mar 11, 1:11 PM PST	Winter Storm Warning	REV	61 hr
Mar 11, 1:48 PM PST	Lake Wind Advisory	REV	29 hr
Mar 14, 3:48 AM PDT	Lake Wind Advisory	REV	16 hr
Mar 19, 1:06 PM PDT	Lake Wind Advisory	REV	58 hr
Mar 21, 5:17 PM PDT	Special Weather Statement	STO	43 min
Mar 26, 1:52 PM PDT	Lake Wind Advisory	REV	33 hr
Apr 12, 2:09 PM PDT	Lake Wind Advisory	REV	54 hr
Apr 21, 3:08 AM PDT	Lake Wind Advisory	REV	29 hr
Apr 21, 11:24 AM PDT	Winter Weather Advisory	REV	36 hr
Apr 29, 9:04 AM PDT	Lake Wind Advisory	REV	29 hr
May 18, 3:45 AM PDT	Lake Wind Advisory	REV	64 hr
Jun 7, 2:20 PM PDT	Lake Wind Advisory	REV	32 hr
Jun 8, 2:50 PM PDT	Lake Wind Advisory	REV	55 hr
Jun 13, 8:41 AM PDT	Lake Wind Advisory	REV	38 hr
Jun 14, 10:07 AM PDT	Lake Wind Advisory	REV	37 hr
Jun 15, 9:47 AM PDT	Lake Wind Advisory	REV	32 hr
Jun 17, 9:52 AM PDT	Lake Wind Advisory	REV	34 hr
Jun 21, 1:58 PM PDT	Lake Wind Advisory	REV	55 hr
Jul 4, 1:43 PM PDT	Lake Wind Advisory	REV	31 hr
Jul 7, 12:40 PM PDT	Lake Wind Advisory	REV	33 hr
Jul 8, 1:58 PM PDT	Lake Wind Advisory	REV	33 hr
Jul 16, 6:34 AM PDT	Fire Weather Watch	REV	30 hr
Jul 17, 2:30 AM PDT	Lake Wind Advisory	REV	20 hr
Jul 17, 2:30 AM PDT	Lake Wind Advisory	REV	43 hr
Jul 17, 1:02 PM PDT	Red Flag Warning	REV	32 hr
Sep 1, 2:43 AM PDT	Lake Wind Advisory	REV	17 hr
Sep 12, 2:32 AM PDT	Lake Wind Advisory	REV	17 hr
Sep 20, 3:52 AM PDT	Lake Wind Advisory	REV	14 hr
Sep 20, 2:51 PM PDT	Lake Wind Advisory	REV	29 hr
Sep 28, 10:57 AM PDT	Fire Weather Watch	REV	43 hr
Sep 29, 2:48 PM PDT	Lake Wind Advisory	REV	44 hr
Oct 1, 3:09 PM PDT	Lake Wind Advisory	REV	29 hr
Oct 2, 2:59 PM PDT	Severe Thunderstorm Warning	STO	46 min
Oct 11, 3:59 AM PDT	High Wind Watch	REV	31 hr
Oct 12, 10:55 AM PDT	High Wind Warning	REV	52 hr
Oct 13, 9:24 AM PDT	High Wind Watch	REV	30 hr
Oct 14, 11:04 AM PDT	Lake Wind Advisory	REV	17 hr
Oct 14, 3:23 PM PDT	High Wind Warning	REV	29 hr
Oct 14, 3:23 PM PDT	Wind Advisory	REV	47 hr
Oct 14, 4:06 PM PDT	Flash Flood Watch	REV	60 hr
Oct 16, 10:53 AM PDT	Lake Wind Advisory	REV	24 hr
Oct 16, 2:00 PM PDT	Areal Flood Advisory	STO	3 hr
Oct 16, 4:00 PM PDT	Winter Weather Advisory	REV	16 hr
Oct 22, 2:18 PM PDT	Lake Wind Advisory	REV	30 hr
Oct 22, 2:18 PM PDT	Lake Wind Advisory	REV	61 hr
Oct 27, 3:29 AM PDT	Lake Wind Advisory	REV	14 hr
Oct 27, 2:50 PM PDT	Winter Weather Advisory	REV	3 days
Oct 27, 2:55 PM PDT	Flash Flood Watch	REV	24 hr
Oct 30, 3:59 PM PDT	Special Weather Statement	STO	61 min
Oct 30, 4:02 PM PDT	Special Weather Statement	STO	58 min
Nov 14, 1:44 PM PST	Lake Wind Advisory	REV	44 hr
Nov 18, 2:46 AM PST	Wind Advisory	REV	37 hr
Nov 18, 1:18 PM PST	Winter Weather Advisory	REV	51 hr
Nov 21, 3:28 AM PST	Winter Weather Advisory	REV	55 hr
Nov 22, 3:11 PM PST	Lake Wind Advisory	REV	23 hr
Nov 24, 2:59 PM PST	Lake Wind Advisory	REV	37 hr
Nov 24, 2:59 PM PST	Wind Advisory	REV	47 hr
Nov 25, 1:44 PM PST	Winter Weather Advisory	REV	44 hr
Nov 27, 1:35 PM PST	Lake Wind Advisory	REV	28 hr
Dec 1, 3:41 AM PST	Lake Wind Advisory	REV	42 hr
Dec 6, 3:10 PM PST	Winter Weather Advisory	REV	43 hr
Dec 8, 4:01 AM PST	Lake Wind Advisory	REV	33 hr
Dec 9, 3:04 AM PST	Wind Advisory	REV	36 hr
Dec 9, 1:31 PM PST	Flood Watch	REV	28 hr
Dec 9, 3:00 PM PST	Lake Wind Advisory	REV	37 hr
Dec 9, 10:15 PM PST	River Flood Warning	REV	25 hr
Dec 10, 6:57 AM PST	Areal Flood Advisory	REV	12 hr
Dec 10, 11:00 AM PST	Areal Flood Advisory	STO	12 hr
Dec 11, 2:22 PM PST	Winter Storm Watch	REV	24 hr
Dec 12, 2:27 PM PST	High Wind Watch	REV	20 hr
Dec 12, 2:30 PM PST	Winter Weather Advisory	REV	44 hr
Dec 13, 10:24 AM PST	High Wind Warning	REV	66 hr
Dec 13, 10:33 AM PST	Flood Watch	REV	65 hr
Dec 14, 2:32 PM PST	River Flood Warning	REV	57 hr
Dec 14, 3:05 PM PST	Winter Storm Warning	REV	43 hr
Dec 15, 3:01 PM PST	Areal Flood Advisory	REV	8 hr
Dec 15, 3:31 PM PST	Areal Flood Advisory	STO	6 hr
Dec 15, 4:33 PM PST	Areal Flood Advisory	STO	5 hr
Dec 15, 4:59 PM PST	Areal Flood Warning	STO	6 hr
Dec 15, 10:24 PM PST	Areal Flood Advisory	STO	3 hr
Dec 15, 11:09 PM PST	Areal Flood Advisory	REV	7 hr
Dec 16, 4:00 AM PST	Lake Wind Advisory	REV	13 hr
Dec 20, 8:47 AM PST	Winter Storm Watch	REV	28 hr
Dec 21, 12:17 PM PST	Winter Storm Warning	REV	64 hr
Dec 21, 12:17 PM PST	Winter Weather Advisory	REV	70 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
Special Weather Statement	3
Flooding
Areal Flood Warning	1
River Flood Warning	2
Flash Flood Watch	3
Flood Watch	3
Areal Flood Advisory	12
Winter
Winter Storm Warning	6
Winter Storm Watch	9
Winter Weather Advisory	17
Wind and dust
High Wind Warning	4
High Wind Watch	3
Lake Wind Advisory	50
Wind Advisory	8
Fire
Red Flag Warning	1
Fire Weather Watch	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 2015 2017

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.