Alert archive / California / Placer County

Weather alerts in Placer County, California, 2019

93 weather alerts in 2019, 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 2019. Tap one for its archive.

Alerts: 93
Warnings: 20
Watches: 13
Advisories: 52
Busiest month: February19 alerts
Busiest day: February 14, 20193 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, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	2	0	100%	2	0%
Flash flood warnings	1	1	0%	3	100%	16 min

Each office's whole area, 2019

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	9	1	89%	3	33%	5 min
NWS Sacramento, CA: severe thunderstorm warnings	17	6	65%	24	54%	16 min
NWS Sacramento, CA: flash flood warnings	11	4	64%	21	43%	52 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, 2:23 PM PST	Winter Storm Watch	REV	37 hr
Jan 4, 3:04 AM PST	Winter Storm Warning	REV	3 days
Jan 4, 1:47 PM PST	Lake Wind Advisory	REV	28 hr
Jan 8, 2:21 AM PST	Winter Weather Advisory	REV	34 hr
Jan 14, 3:38 PM PST	Winter Storm Watch	REV	23 hr
Jan 14, 3:38 PM PST	Winter Weather Advisory	REV	48 hr
Jan 15, 2:14 PM PST	Blizzard Warning	REV	41 hr
Jan 15, 2:14 PM PST	Winter Storm Warning	REV	57 hr
Jan 16, 7:15 PM PST	Areal Flood Advisory	STO	10 hr
Jan 18, 12:04 PM PST	Winter Storm Watch	REV	24 hr
Jan 19, 12:10 PM PST	Winter Storm Warning	REV	40 hr
Jan 30, 2:12 PM PST	Winter Storm Watch	REV	24 hr
Jan 31, 2:15 PM PST	Winter Storm Warning	REV	5 days
Feb 3, 11:14 AM PST	Blizzard Warning	REV	35 hr
Feb 3, 1:18 PM PST	Mesoscale Discussion	SPC	6 hr
Feb 7, 1:30 PM PST	Winter Storm Warning	REV	3 days
Feb 9, 6:15 PM PST	Mesoscale Discussion	SPC	4 hr
Feb 11, 3:39 AM PST	Winter Storm Watch	REV	27 hr
Feb 12, 6:26 AM PST	Winter Storm Warning	REV	6 days
Feb 13, 8:13 AM PST	Areal Flood Warning	STO	12 hr
Feb 13, 1:24 PM PST	Areal Flood Advisory	REV	6 hr
Feb 13, 7:46 PM PST	Areal Flood Warning	STO	48 hr
Feb 13, 11:07 PM PST	Areal Flood Advisory	REV	12 hr
Feb 14, 8:19 AM PST	Areal Flood Advisory	REV	3 hr
Feb 23, 3:46 PM PST	Lake Wind Advisory	REV	42 hr
Feb 24, 3:22 AM PST	Winter Storm Watch	REV	9 hr
Feb 24, 12:27 PM PST	Winter Storm Warning	REV	4 days
Feb 26, 3:20 AM PST	Areal Flood Advisory	STO	8 hr
Feb 26, 11:28 AM PST	Areal Flood Warning	STO	51 hr
Feb 28, 3:53 AM PST	Winter Storm Watch	REV	24 hr
Feb 28, 3:54 AM PST	Lake Wind Advisory	REV	18 hr
Feb 28, 2:04 PM PST	Lake Wind Advisory	REV	29 hr
Mar 1, 3:45 AM PST	Winter Weather Advisory	REV	38 hr
Mar 3, 3:22 PM PST	Winter Storm Watch	REV	23 hr
Mar 4, 2:17 PM PST	Winter Weather Advisory	REV	67 hr
Mar 23, 2:45 PM PDT	Winter Storm Watch	REV	49 hr
Mar 24, 11:24 AM PDT	Lake Wind Advisory	REV	3 days
Mar 25, 3:25 PM PDT	Winter Storm Warning	REV	56 hr
Mar 27, 2:36 PM PDT	Special Weather Statement	STO	54 min
Apr 4, 10:50 AM PDT	Lake Wind Advisory	REV	34 hr
Apr 7, 12:26 PM PDT	Lake Wind Advisory	REV	33 hr
Apr 9, 3:34 PM PDT	Special Weather Statement	STO	26 min
Apr 13, 2:46 PM PDT	Lake Wind Advisory	REV	53 hr
Apr 20, 2:09 AM PDT	Lake Wind Advisory	REV	18 hr
May 9, 9:05 AM PDT	Lake Wind Advisory	REV	28 hr
May 14, 3:23 PM PDT	Lake Wind Advisory	REV	54 hr
May 15, 2:08 PM PDT	Winter Weather Advisory	REV	18 hr
May 16, 2:55 PM PDT	Winter Weather Advisory	REV	19 hr
May 17, 3:40 AM PDT	Winter Weather Advisory	REV	54 hr
May 19, 2:03 PM PDT	Winter Weather Advisory	REV	44 hr
May 23, 3:04 PM PDT	Flash Flood Warning	STO	3 hr
May 23, 3:08 PM PDT	Areal Flood Advisory	STO	3 hr
May 25, 2:30 AM PDT	Winter Weather Advisory	REV	51 hr
May 29, 4:26 PM PDT	Special Weather Statement	STO	34 min
Jun 1, 5:38 PM PDT	Special Weather Statement	STO	67 min
Jun 1, 7:04 PM PDT	Special Weather Statement	STO	26 min
Jun 1, 7:43 PM PDT	Severe Thunderstorm Warning	STO	47 min
Jun 5, 3:02 PM PDT	Lake Wind Advisory	REV	30 hr
Jun 17, 4:26 PM PDT	Severe Thunderstorm Warning	STO	28 min
Jun 19, 4:02 PM PDT	Lake Wind Advisory	REV	30 hr
Jun 24, 3:42 PM PDT	Lake Wind Advisory	REV	3 days
Jul 13, 2:39 PM PDT	Lake Wind Advisory	REV	30 hr
Sep 11, 1:41 PM PDT	Fire Weather Watch	REV	62 hr
Sep 14, 3:19 AM PDT	Red Flag Warning	REV	63 hr
Sep 14, 2:19 PM PDT	Lake Wind Advisory	REV	54 hr
Sep 16, 5:18 PM PDT	Special Weather Statement	STO	42 min
Sep 17, 2:35 PM PDT	Lake Wind Advisory	REV	29 hr
Sep 22, 2:08 AM PDT	Lake Wind Advisory	REV	20 hr
Sep 26, 2:30 PM PDT	Lake Wind Advisory	REV	57 hr
Sep 27, 3:03 PM PDT	Winter Weather Advisory	REV	35 hr
Sep 28, 12:09 PM PDT	Winter Weather Advisory	REV	46 hr
Oct 3, 3:54 AM PDT	Lake Wind Advisory	REV	19 hr
Oct 7, 1:53 PM PDT	Lake Wind Advisory	REV	3 days
Oct 18, 1:20 PM PDT	Lake Wind Advisory	REV	31 hr
Oct 22, 1:57 PM PDT	Lake Wind Advisory	REV	42 hr
Oct 25, 1:51 PM PDT	Lake Wind Advisory	REV	56 hr
Oct 28, 1:09 PM PDT	Lake Wind Advisory	REV	33 hr
Nov 19, 2:11 AM PST	Winter Weather Advisory	REV	34 hr
Nov 20, 2:11 AM PST	Lake Wind Advisory	REV	13 hr
Nov 22, 1:12 PM PST	Winter Storm Watch	REV	49 hr
Nov 24, 2:00 PM PST	Winter Storm Warning	REV	4 days
Nov 27, 12:53 PM PST	Winter Storm Watch	REV	51 hr
Nov 29, 3:44 PM PST	Winter Storm Warning	REV	66 hr
Dec 3, 2:26 PM PST	Winter Storm Watch	REV	48 hr
Dec 5, 2:45 PM PST	Winter Storm Warning	REV	67 hr
Dec 12, 3:48 AM PST	Winter Weather Advisory	REV	53 hr
Dec 12, 2:50 PM PST	Lake Wind Advisory	REV	40 hr
Dec 14, 2:29 PM PST	Winter Weather Advisory	REV	13 hr
Dec 20, 2:08 AM PST	Lake Wind Advisory	REV	17 hr
Dec 20, 6:46 PM PST	Wind Advisory	REV	45 hr
Dec 22, 2:28 AM PST	Winter Weather Advisory	REV	50 hr
Dec 25, 8:51 PM PST	Lake Wind Advisory	REV	25 hr
Dec 29, 12:44 PM PST	Lake Wind Advisory	REV	42 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
Mesoscale Discussion	2
Special Weather Statement	6
Flooding
Areal Flood Warning	3
Flash Flood Warning	1
Areal Flood Advisory	6
Winter
Blizzard Warning	2
Winter Storm Warning	11
Winter Storm Watch	12
Winter Weather Advisory	15
Wind and dust
Lake Wind Advisory	30
Wind Advisory	1
Fire
Red Flag Warning	1
Fire Weather Watch	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 2018 2020

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.