Alert archive / California / Nevada County

Weather alerts in Nevada County, California, 2017

138 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Nevada County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts: 138
Warnings: 36
Watches: 22
Advisories: 70
Busiest month: February26 alerts
Busiest day: September 12, 20175 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering Nevada County in 2017 had a tornado report inside them.

Nevada County, 2017

	Warnings	False alarm ratio	Reports	Inside a warning
Tornado warnings	1	100%	0
Severe thunderstorm warnings	2	100%	0
Flash flood warnings	2	100%	9	0%

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Sacramento, CA: tornado warnings	3	0	100%	1	0%
NWS Sacramento, CA: severe thunderstorm warnings	17	5	71%	6	100%	11 min
NWS Sacramento, CA: flash flood warnings	2	0	100%	29	0%
NWS Reno, NV: tornado warnings	1	0	100%	0
NWS Reno, NV: severe thunderstorm warnings	26	3	88%	15	20%	4 min
NWS Reno, NV: flash flood warnings	15	1	93%	29	7%	72 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, 12:31 AM PST	Winter Storm Warning	REV	3 days
Jan 3, 1:45 PM PST	Mesoscale Discussion	SPC	6 hr
Jan 4, 8:42 AM PST	Flood Watch	REV	5 days
Jan 6, 4:33 AM PST	Winter Weather Advisory	REV	55 hr
Jan 6, 9:08 AM PST	River Flood Warning	REV	4 days
Jan 8, 6:22 AM PST	Areal Flood Warning	STO	48 hr
Jan 8, 11:44 AM PST	Areal Flood Warning	REV	6 hr
Jan 8, 2:54 PM PST	Winter Storm Warning	REV	4 days
Jan 8, 4:55 PM PST	Areal Flood Warning	REV	9 hr
Jan 9, 1:29 AM PST	Areal Flood Warning	REV	12 hr
Jan 9, 1:45 AM PST	Areal Flood Warning	REV	12 hr
Jan 10, 2:34 AM PST	Blizzard Warning	REV	31 hr
Jan 10, 2:34 AM PST	Winter Storm Warning	REV	67 hr
Jan 10, 3:10 AM PST	Areal Flood Warning	STO	60 hr
Jan 12, 2:31 PM PST	Areal Flood Warning	STO	24 hr
Jan 17, 3:39 AM PST	Lake Wind Advisory	REV	36 hr
Jan 17, 3:43 AM PST	Winter Weather Advisory	REV	54 hr
Jan 18, 4:16 PM PST	Mesoscale Discussion	SPC	5 hr
Jan 19, 4:09 AM PST	Winter Weather Advisory	REV	35 hr
Jan 19, 10:21 AM PST	Winter Storm Warning	REV	4 days
Jan 30, 3:11 PM PST	Winter Storm Watch	REV	23 hr
Jan 31, 2:01 PM PST	Winter Storm Warning	REV	4 days
Feb 3, 3:19 AM PST	Lake Wind Advisory	REV	31 hr
Feb 4, 12:54 PM PST	Winter Storm Watch	REV	15 hr
Feb 5, 3:57 AM PST	Winter Storm Warning	REV	48 hr
Feb 5, 4:00 AM PST	Lake Wind Advisory	REV	17 hr
Feb 5, 12:34 PM PST	Flood Watch	REV	5 days
Feb 6, 3:31 PM PST	Wind Advisory	REV	22 hr
Feb 7, 4:20 AM PST	Areal Flood Warning	STO	36 hr
Feb 7, 6:51 AM PST	Areal Flood Warning	REV	12 hr
Feb 7, 9:26 AM PST	Areal Flood Warning	STO	6 days
Feb 7, 3:51 PM PST	High Wind Watch	REV	21 hr
Feb 7, 10:18 PM PST	Flood Watch	REV	61 hr
Feb 8, 10:24 AM PST	Areal Flood Warning	REV	21 hr
Feb 8, 10:42 AM PST	River Flood Warning	REV	44 hr
Feb 8, 12:50 PM PST	Winter Storm Warning	REV	61 hr
Feb 9, 1:46 AM PST	Lake Wind Advisory	REV	8 hr
Feb 9, 12:27 PM PST	Areal Flood Warning	REV	57 hr
Feb 15, 2:58 AM PST	High Wind Watch	REV	13 hr
Feb 15, 10:37 AM PST	Winter Weather Advisory	REV	26 hr
Feb 15, 3:33 PM PST	Lake Wind Advisory	REV	26 hr
Feb 16, 3:19 PM PST	Winter Weather Advisory	REV	38 hr
Feb 16, 4:04 PM PST	Flood Watch	REV	4 days
Feb 18, 3:41 PM PST	Winter Storm Warning	REV	4 days
Feb 18, 3:43 PM PST	Lake Wind Advisory	REV	30 hr
Feb 18, 3:58 PM PST	Areal Flood Warning	STO	5 days
Feb 24, 2:42 PM PST	Winter Weather Advisory	REV	67 hr
Feb 25, 2:27 PM PST	Lake Wind Advisory	REV	29 hr
Mar 2, 2:33 AM PST	Winter Storm Watch	REV	30 hr
Mar 3, 8:48 AM PST	Winter Storm Warning	REV	3 days
Mar 4, 2:48 AM PST	Lake Wind Advisory	REV	13 hr
Mar 4, 3:36 PM PST	Lake Wind Advisory	REV	50 hr
Mar 14, 3:05 PM PDT	Lake Wind Advisory	REV	29 hr
Mar 17, 2:33 PM PDT	Lake Wind Advisory	REV	29 hr
Mar 20, 2:15 PM PDT	Lake Wind Advisory	REV	29 hr
Mar 21, 12:05 PM PDT	Special Weather Statement	STO	40 min
Mar 21, 12:34 PM PDT	Mesoscale Discussion	SPC	116 min
Mar 23, 2:58 PM PDT	Winter Weather Advisory	REV	30 hr
Mar 28, 3:38 PM PDT	Wind Advisory	REV	53 hr
Mar 30, 2:59 PM PDT	Lake Wind Advisory	REV	27 hr
Apr 4, 3:14 PM PDT	Flood Watch	REV	71 hr
Apr 4, 3:14 PM PDT	Winter Storm Watch	REV	44 hr
Apr 5, 3:21 PM PDT	Lake Wind Advisory	REV	33 hr
Apr 6, 11:11 AM PDT	Winter Storm Warning	REV	52 hr
Apr 11, 2:56 PM PDT	Lake Wind Advisory	REV	52 hr
Apr 11, 3:16 PM PDT	Winter Weather Advisory	REV	47 hr
Apr 13, 2:51 PM PDT	Severe Thunderstorm Warning	STO	24 min
Apr 13, 3:11 PM PDT	Tornado Warning	STO	49 min
Apr 15, 3:03 PM PDT	Lake Wind Advisory	REV	37 hr
Apr 22, 3:22 AM PDT	Lake Wind Advisory	REV	20 hr
Apr 23, 2:07 PM PDT	Lake Wind Advisory	REV	30 hr
Apr 25, 12:52 PM PDT	Lake Wind Advisory	REV	31 hr
Apr 26, 3:07 PM PDT	Areal Flood Advisory	REV	6 days
May 2, 12:22 PM PDT	Areal Flood Advisory	REV	14 days
May 4, 3:37 PM PDT	Lake Wind Advisory	REV	28 hr
May 6, 7:28 AM PDT	Flood Watch	REV	19 hr
May 6, 2:27 PM PDT	Winter Weather Advisory	REV	21 hr
May 10, 3:18 PM PDT	Lake Wind Advisory	REV	45 hr
May 15, 2:49 PM PDT	Lake Wind Advisory	REV	36 hr
May 18, 11:45 AM PDT	Areal Flood Advisory	REV	6 days
May 18, 11:56 AM PDT	Flood Watch	REV	5 days
May 23, 8:47 AM PDT	Areal Flood Advisory	REV	8 days
May 23, 12:42 PM PDT	Lake Wind Advisory	REV	33 hr
May 28, 4:04 PM PDT	Special Weather Statement	STO	41 min
Jun 2, 2:57 PM PDT	Lake Wind Advisory	REV	55 hr
Jun 7, 2:55 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 8, 12:26 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 9, 2:28 PM PDT	Lake Wind Advisory	REV	30 hr
Jun 10, 2:02 PM PDT	Lake Wind Advisory	REV	30 hr
Jun 11, 1:44 PM PDT	Lake Wind Advisory	REV	30 hr
Jul 3, 7:29 AM PDT	Fire Weather Watch	REV	24 hr
Jul 8, 2:25 PM PDT	Lake Wind Advisory	REV	54 hr
Jul 16, 2:20 PM PDT	Lake Wind Advisory	REV	30 hr
Jul 19, 6:38 PM PDT	Dense Smoke Advisory	REV	15 hr
Jul 22, 9:09 AM PDT	Red Flag Warning	REV	37 hr
Aug 5, 10:53 AM PDT	Flash Flood Watch	REV	9 hr
Aug 7, 4:46 PM PDT	Flash Flood Warning	REV	119 min
Aug 18, 5:21 PM PDT	Flash Flood Warning	REV	3 hr
Aug 21, 4:40 PM PDT	Special Weather Statement	STO	50 min
Aug 22, 3:02 PM PDT	Areal Flood Advisory	REV	3 hr
Aug 27, 9:37 AM PDT	Fire Weather Watch	REV	45 hr
Sep 6, 3:26 AM PDT	Fire Weather Watch	REV	5 hr
Sep 6, 8:48 AM PDT	Red Flag Warning	REV	23 hr
Sep 12, 12:51 PM PDT	Special Weather Statement	STO	24 min
Sep 12, 2:18 PM PDT	Special Weather Statement	STO	42 min
Sep 12, 2:32 PM PDT	Special Weather Statement	STO	43 min
Sep 12, 2:57 PM PDT	Severe Thunderstorm Warning	STO	48 min
Sep 12, 4:18 PM PDT	Special Weather Statement	STO	42 min
Sep 13, 2:56 PM PDT	Lake Wind Advisory	REV	29 hr
Sep 13, 3:43 PM PDT	Areal Flood Advisory	REV	3 hr
Sep 17, 3:08 AM PDT	Lake Wind Advisory	REV	43 hr
Sep 19, 2:09 PM PDT	Lake Wind Advisory	REV	31 hr
Oct 9, 3:28 AM PDT	Lake Wind Advisory	REV	9 hr
Oct 9, 1:41 PM PDT	Lake Wind Advisory	REV	45 hr
Oct 13, 2:40 PM PDT	Lake Wind Advisory	REV	22 hr
Oct 17, 3:29 PM PDT	Lake Wind Advisory	REV	62 hr
Oct 19, 6:05 AM PDT	Red Flag Warning	REV	14 hr
Oct 31, 2:44 PM PDT	Winter Storm Watch	REV	47 hr
Nov 2, 2:12 PM PDT	Lake Wind Advisory	REV	29 hr
Nov 2, 2:12 PM PDT	Winter Storm Warning	REV	48 hr
Nov 7, 2:25 PM PST	Lake Wind Advisory	REV	3 days
Nov 12, 1:02 PM PST	Lake Wind Advisory	REV	33 hr
Nov 12, 3:30 PM PST	Winter Storm Watch	REV	47 hr
Nov 14, 2:48 PM PST	Winter Storm Warning	REV	61 hr
Nov 15, 4:08 AM PST	Lake Wind Advisory	REV	12 hr
Nov 15, 1:01 PM PST	Flood Watch	REV	33 hr
Nov 15, 3:11 PM PST	Areal Flood Advisory	STO	24 hr
Nov 22, 2:48 PM PST	High Wind Watch	REV	61 hr
Nov 25, 3:23 AM PST	Lake Wind Advisory	REV	25 hr
Nov 25, 3:23 AM PST	Wind Advisory	REV	49 hr
Nov 25, 2:03 PM PST	Winter Weather Advisory	REV	44 hr
Nov 30, 2:30 PM PST	Lake Wind Advisory	REV	72 hr
Dec 4, 1:58 AM PST	Lake Wind Advisory	REV	32 hr
Dec 15, 3:17 PM PST	Lake Wind Advisory	REV	42 hr
Dec 18, 3:35 AM PST	High Wind Watch	REV	11 hr
Dec 18, 2:30 PM PST	Winter Weather Advisory	REV	44 hr
Dec 18, 2:32 PM PST	Wind Advisory	REV	34 hr
Dec 20, 3:03 PM PST	Lake Wind Advisory	REV	28 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
Tornado Warning	1
Mesoscale Discussion	3
Special Weather Statement	7
Flooding
Areal Flood Warning	13
Flash Flood Warning	2
River Flood Warning	2
Flash Flood Watch	1
Flood Watch	8
Areal Flood Advisory	7
Winter
Blizzard Warning	1
Winter Storm Warning	12
Winter Storm Watch	6
Winter Weather Advisory	11
Wind and dust
High Wind Watch	4
Lake Wind Advisory	47
Wind Advisory	4
Fire
Red Flag Warning	3
Fire Weather Watch	3
Fog and smoke
Dense Smoke 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 2016 2018

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.