Alert archive / California / Placer County

Weather alerts in Placer County, California, 2018

109 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts: 109
Warnings: 17
Watches: 23
Advisories: 67
Busiest month: March16 alerts
Busiest day: March 22, 20184 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, 2018

	Warnings	With a report	False alarm ratio
Tornado warnings	0
Severe thunderstorm warnings	2	0	100%
Flash flood warnings	1	0	100%

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Reno, NV: severe thunderstorm warnings	18	0	100%	1	0%
NWS Reno, NV: flash flood warnings	19	5	74%	13	46%	57 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 6, 2:44 PM PST	Winter Storm Watch	REV	23 hr
Jan 7, 2:01 PM PST	Winter Weather Advisory	REV	36 hr
Jan 8, 11:22 PM PST	Areal Flood Advisory	STO	10 hr
Jan 9, 9:21 AM PST	Areal Flood Advisory	STO	9 hr
Jan 11, 3:42 PM PST	Lake Wind Advisory	REV	5 hr
Jan 15, 2:32 PM PST	Winter Storm Watch	REV	48 hr
Jan 17, 2:32 PM PST	Lake Wind Advisory	REV	28 hr
Jan 17, 2:32 PM PST	Winter Storm Warning	REV	41 hr
Jan 22, 3:00 PM PST	Lake Wind Advisory	REV	55 hr
Jan 22, 3:06 PM PST	Winter Weather Advisory	REV	3 days
Feb 10, 3:12 AM PST	Lake Wind Advisory	REV	25 hr
Feb 10, 2:51 PM PST	Lake Wind Advisory	REV	31 hr
Feb 14, 2:15 AM PST	Lake Wind Advisory	REV	20 hr
Feb 16, 2:50 PM PST	Wind Advisory	REV	55 hr
Feb 18, 5:44 PM PST	Winter Weather Advisory	REV	4 hr
Feb 21, 3:25 AM PST	Winter Weather Advisory	REV	43 hr
Feb 23, 2:57 PM PST	Lake Wind Advisory	REV	28 hr
Feb 24, 1:58 PM PST	Winter Weather Advisory	REV	65 hr
Feb 26, 3:06 PM PST	Areal Flood Advisory	STO	3 hr
Feb 27, 3:30 AM PST	Winter Storm Watch	REV	23 hr
Feb 27, 2:12 PM PST	Winter Storm Warning	REV	4 days
Feb 28, 9:37 AM PST	Blizzard Warning	REV	49 hr
Mar 7, 3:01 PM PST	Lake Wind Advisory	REV	28 hr
Mar 11, 2:34 PM PDT	Winter Storm Watch	REV	12 hr
Mar 12, 2:54 AM PDT	Winter Weather Advisory	REV	67 hr
Mar 12, 2:25 PM PDT	Winter Storm Warning	REV	55 hr
Mar 13, 3:28 AM PDT	Winter Storm Watch	REV	47 hr
Mar 13, 4:45 PM PDT	Winter Storm Warning	REV	3 days
Mar 16, 2:40 PM PDT	Special Weather Statement	STO	35 min
Mar 19, 1:34 PM PDT	Winter Storm Watch	REV	23 hr
Mar 20, 12:49 PM PDT	Lake Wind Advisory	REV	55 hr
Mar 20, 12:49 PM PDT	Winter Storm Warning	REV	58 hr
Mar 20, 2:24 PM PDT	Flood Watch	REV	48 hr
Mar 22, 7:28 AM PDT	Special Weather Statement	STO	62 min
Mar 22, 8:02 AM PDT	Areal Flood Advisory	STO	3 hr
Mar 22, 11:15 AM PDT	Areal Flood Advisory	STO	6 hr
Mar 22, 2:11 PM PDT	Winter Weather Advisory	REV	63 hr
Mar 23, 2:58 AM PDT	Lake Wind Advisory	REV	20 hr
Apr 3, 9:12 AM PDT	Flood Watch	REV	4 days
Apr 3, 9:49 AM PDT	River Flood Warning	REV	5 days
Apr 5, 3:06 PM PDT	Lake Wind Advisory	REV	53 hr
Apr 7, 5:45 AM PDT	Areal Flood Advisory	REV	22 hr
Apr 7, 7:15 AM PDT	Areal Flood Advisory	STO	6 hr
Apr 9, 2:36 AM PDT	Lake Wind Advisory	REV	62 hr
Apr 9, 9:02 AM PDT	Areal Flood Advisory	REV	8 days
Apr 11, 2:23 AM PDT	Winter Weather Advisory	REV	25 hr
Apr 14, 4:23 AM PDT	Lake Wind Advisory	REV	37 hr
Apr 14, 4:49 AM PDT	Winter Weather Advisory	REV	51 hr
Apr 16, 8:01 AM PDT	Winter Weather Advisory	REV	3 hr
Apr 27, 3:18 AM PDT	Lake Wind Advisory	REV	17 hr
Apr 27, 8:16 PM PDT	Lake Wind Advisory	REV	24 hr
May 24, 11:37 AM PDT	Winter Weather Advisory	REV	27 hr
May 25, 2:52 AM PDT	Flood Watch	REV	12 hr
May 29, 12:26 PM PDT	Lake Wind Advisory	REV	33 hr
Jun 2, 3:22 PM PDT	Lake Wind Advisory	REV	55 hr
Jun 7, 1:42 PM PDT	Lake Wind Advisory	REV	57 hr
Jun 14, 1:33 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 16, 3:17 AM PDT	Lake Wind Advisory	REV	18 hr
Jun 26, 3:07 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 30, 10:03 AM PDT	Lake Wind Advisory	REV	5 hr
Jul 22, 8:13 AM PDT	Flash Flood Watch	REV	13 hr
Jul 22, 5:07 PM PDT	Areal Flood Advisory	REV	113 min
Jul 22, 6:06 PM PDT	Severe Thunderstorm Warning	REV	39 min
Jul 23, 3:10 AM PDT	Flash Flood Watch	REV	18 hr
Jul 23, 4:01 PM PDT	Flash Flood Warning	REV	3 hr
Jul 23, 5:06 PM PDT	Severe Thunderstorm Warning	REV	39 min
Jul 23, 5:44 PM PDT	Areal Flood Advisory	REV	2 hr
Jul 24, 9:37 AM PDT	Flash Flood Watch	REV	10 hr
Aug 1, 1:07 PM PDT	Fire Weather Watch	REV	22 hr
Aug 2, 11:00 AM PDT	Red Flag Warning	REV	59 hr
Aug 2, 1:31 PM PDT	Lake Wind Advisory	REV	56 hr
Aug 3, 1:18 PM PDT	Dense Smoke Advisory	REV	41 hr
Aug 6, 10:04 AM PDT	Dense Smoke Advisory	REV	19 hr
Aug 23, 12:19 PM PDT	Fire Weather Watch	REV	50 hr
Sep 9, 3:01 PM PDT	Fire Weather Watch	REV	20 hr
Sep 10, 11:10 AM PDT	Red Flag Warning	REV	66 hr
Sep 10, 2:39 PM PDT	Lake Wind Advisory	REV	53 hr
Sep 14, 2:31 PM PDT	Lake Wind Advisory	REV	29 hr
Sep 26, 2:47 PM PDT	Fire Weather Watch	REV	38 hr
Sep 28, 2:36 AM PDT	Lake Wind Advisory	REV	50 hr
Sep 28, 5:10 AM PDT	Red Flag Warning	REV	39 hr
Oct 3, 4:09 PM PDT	Areal Flood Advisory	STO	3 hr
Oct 13, 8:40 AM PDT	Lake Wind Advisory	REV	50 hr
Oct 25, 1:57 PM PDT	Fire Weather Watch	REV	45 hr
Oct 26, 2:37 PM PDT	Lake Wind Advisory	REV	65 hr
Oct 27, 11:11 AM PDT	Red Flag Warning	REV	35 hr
Oct 29, 3:47 PM PDT	Lake Wind Advisory	REV	11 hr
Nov 7, 12:45 PM PST	Lake Wind Advisory	REV	26 hr
Nov 10, 3:20 AM PST	Lake Wind Advisory	REV	39 hr
Nov 19, 11:14 AM PST	Winter Storm Watch	REV	29 hr
Nov 20, 3:44 PM PST	Winter Storm Warning	REV	38 hr
Nov 21, 3:37 AM PST	High Wind Watch	REV	25 hr
Nov 21, 3:37 AM PST	Wind Advisory	REV	63 hr
Nov 22, 4:07 AM PST	Winter Weather Advisory	REV	36 hr
Nov 26, 9:14 AM PST	Winter Storm Watch	REV	28 hr
Nov 27, 12:55 PM PST	Winter Storm Warning	REV	63 hr
Nov 28, 2:50 PM PST	Winter Storm Watch	REV	23 hr
Nov 29, 12:00 AM PST	Areal Flood Advisory	STO	6 hr
Nov 29, 1:57 PM PST	Winter Storm Warning	REV	49 hr
Dec 13, 3:23 AM PST	High Wind Watch	REV	11 hr
Dec 13, 2:42 PM PST	Wind Advisory	REV	29 hr
Dec 15, 2:51 PM PST	Winter Weather Advisory	REV	42 hr
Dec 15, 2:52 PM PST	Lake Wind Advisory	REV	38 hr
Dec 16, 4:54 PM PST	Areal Flood Advisory	STO	6 hr
Dec 19, 3:26 PM PST	Lake Wind Advisory	REV	35 hr
Dec 21, 2:17 PM PST	Winter Storm Watch	REV	36 hr
Dec 23, 2:45 AM PST	Winter Weather Advisory	REV	50 hr
Dec 27, 1:52 AM PST	Lake Wind Advisory	REV	38 hr
Dec 30, 1:15 PM PST	Lake Wind Advisory	REV	45 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
Special Weather Statement	2
Flooding
Flash Flood Warning	1
River Flood Warning	1
Flash Flood Watch	3
Flood Watch	3
Areal Flood Advisory	13
Winter
Blizzard Warning	1
Winter Storm Warning	8
Winter Storm Watch	10
Winter Weather Advisory	14
Wind and dust
High Wind Watch	2
Lake Wind Advisory	35
Wind Advisory	3
Fire
Red Flag Warning	4
Fire Weather Watch	5
Fog and smoke
Dense Smoke Advisory	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.