Alert archive / California / Sierra County

Weather alerts in Sierra County, California, 2013

72 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sierra County and its neighbors

Each county as a circle sized by its count in 2013. Tap one for its archive.

Alerts: 72
Warnings: 21
Watches: 11
Advisories: 27
Busiest month: July17 alerts
Busiest day: August 21, 20136 alerts

Over time

By month

Warning verification

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

Sierra County, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	0			0
Severe thunderstorm warnings	8	0	100%	1	0%
Flash flood warnings	4	2	50%	0

Each office's whole area, 2013

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Reno, NV: severe thunderstorm warnings	46	6	87%	31	29%	14 min
NWS Reno, NV: flash flood warnings	23	5	78%	19	42%	44 min
NWS Sacramento, CA: tornado warnings	2	2	0%	6	33%	11 min
NWS Sacramento, CA: severe thunderstorm warnings	16	2	88%	4	50%	2 min
NWS Sacramento, CA: flash flood warnings	3	0	100%	0

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 8, 2:12 PM PST	Winter Weather Advisory	REV	26 hr
Jan 9, 2:37 PM PST	Winter Storm Warning	REV	13 hr
Jan 17, 9:30 PM PST	Freezing Fog Advisory	REV	13 hr
Jan 18, 2:14 PM PST	Freezing Fog Advisory	REV	20 hr
Jan 24, 8:50 PM PST	Dense Fog Advisory	REV	13 hr
Jan 25, 10:19 PM PST	Dense Fog Advisory	REV	12 hr
Jan 27, 12:11 AM PST	Winter Weather Advisory	REV	9 hr
Feb 18, 3:57 AM PST	Winter Weather Advisory	REV	48 hr
Mar 4, 3:01 PM PST	Winter Weather Advisory	REV	52 hr
Mar 19, 2:05 PM PDT	Wind Advisory	REV	33 hr
Apr 6, 1:39 PM PDT	Wind Advisory	REV	49 hr
May 5, 1:47 PM PDT	Special Weather Statement	STO	43 min
May 5, 1:57 PM PDT	Severe Thunderstorm Warning	STO	33 min
May 5, 2:47 PM PDT	Mesoscale Discussion	SPC	118 min
May 5, 4:26 PM PDT	Special Weather Statement	REV	34 min
May 5, 4:28 PM PDT	Special Weather Statement	REV	32 min
May 21, 3:34 AM PDT	Wind Advisory	REV	17 hr
May 26, 3:26 AM PDT	Lake Wind Advisory	REV	18 hr
Jun 8, 9:20 AM PDT	Fire Weather Watch	REV	20 hr
Jun 9, 5:03 AM PDT	Red Flag Warning	REV	22 hr
Jun 9, 4:03 PM PDT	Areal Flood Advisory	REV	117 min
Jun 11, 10:39 AM PDT	Red Flag Warning	REV	36 hr
Jun 11, 3:20 PM PDT	Lake Wind Advisory	REV	29 hr
Jun 16, 3:35 AM PDT	Fire Weather Watch	REV	24 hr
Jun 17, 3:37 AM PDT	Red Flag Warning	REV	43 hr
Jun 17, 2:13 PM PDT	Lake Wind Advisory	REV	33 hr
Jul 2, 2:47 PM PDT	Special Weather Statement	REV	43 min
Jul 2, 3:22 PM PDT	Flash Flood Warning	REV	3 hr
Jul 2, 4:06 PM PDT	Areal Flood Advisory	REV	3 hr
Jul 2, 4:17 PM PDT	Flash Flood Warning	REV	3 hr
Jul 2, 10:37 PM PDT	Flash Flood Watch	REV	22 hr
Jul 3, 6:35 PM PDT	Severe Thunderstorm Warning	REV	40 min
Jul 3, 7:37 PM PDT	Special Weather Statement	REV	38 min
Jul 3, 7:46 PM PDT	Flash Flood Warning	REV	3 hr
Jul 4, 1:52 PM PDT	Severe Thunderstorm Warning	REV	38 min
Jul 15, 3:18 PM PDT	Lake Wind Advisory	REV	30 hr
Jul 25, 2:03 PM PDT	Special Weather Statement	REV	42 min
Jul 25, 2:08 PM PDT	Severe Thunderstorm Warning	REV	52 min
Jul 25, 2:43 PM PDT	Severe Thunderstorm Warning	REV	32 min
Jul 25, 3:36 PM PDT	Flash Flood Warning	REV	3 hr
Jul 25, 3:53 PM PDT	Severe Thunderstorm Warning	REV	37 min
Jul 29, 3:15 PM PDT	Fire Weather Watch	REV	24 hr
Jul 29, 3:15 PM PDT	Fire Weather Watch	REV	47 hr
Aug 6, 10:18 AM PDT	Fire Weather Watch	REV	25 hr
Aug 7, 11:34 AM PDT	Red Flag Warning	REV	32 hr
Aug 21, 2:28 AM PDT	Flash Flood Watch	REV	16 hr
Aug 21, 12:30 PM PDT	Mesoscale Discussion	SPC	3 hr
Aug 21, 12:45 PM PDT	Special Weather Statement	REV	30 min
Aug 21, 2:29 PM PDT	Severe Thunderstorm Warning	STO	46 min
Aug 21, 3:38 PM PDT	Severe Thunderstorm Warning	STO	22 min
Aug 21, 4:16 PM PDT	Special Weather Statement	STO	29 min
Aug 25, 2:41 AM PDT	Lake Wind Advisory	REV	17 hr
Sep 2, 10:40 AM PDT	Areal Flood Advisory	STO	12 hr
Sep 4, 6:20 AM PDT	Fire Weather Watch	REV	5 hr
Sep 4, 10:52 AM PDT	Red Flag Warning	REV	36 hr
Sep 13, 3:30 PM PDT	Special Weather Statement	STO	45 min
Sep 14, 3:59 PM PDT	Special Weather Statement	REV	46 min
Sep 14, 4:40 PM PDT	Areal Flood Advisory	REV	3 hr
Sep 14, 5:45 PM PDT	Special Weather Statement	REV	60 min
Sep 18, 2:31 PM PDT	Fire Weather Watch	REV	18 hr
Sep 19, 8:29 AM PDT	Red Flag Warning	REV	52 hr
Sep 27, 2:26 PM PDT	Fire Weather Watch	REV	23 hr
Sep 28, 1:24 PM PDT	Red Flag Warning	REV	34 hr
Sep 28, 2:25 PM PDT	Wind Advisory	REV	30 hr
Oct 27, 2:53 PM PDT	Winter Weather Advisory	REV	24 hr
Dec 1, 2:06 PM PST	Wind Advisory	REV	38 hr
Dec 2, 11:06 AM PST	Winter Weather Advisory	REV	32 hr
Dec 5, 2:37 AM PST	Winter Storm Watch	REV	14 hr
Dec 5, 3:34 PM PST	Winter Storm Warning	REV	42 hr
Dec 18, 2:33 AM PST	Freezing Fog Advisory	REV	7 hr
Dec 26, 4:39 PM PST	Freezing Fog Advisory	REV	22 hr
Dec 27, 8:17 PM PST	Freezing Fog Advisory	REV	17 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	8
Mesoscale Discussion	2
Special Weather Statement	11
Flooding
Flash Flood Warning	4
Flash Flood Watch	2
Areal Flood Advisory	4
Winter
Winter Storm Warning	2
Winter Storm Watch	1
Winter Weather Advisory	6
Wind and dust
Lake Wind Advisory	5
Wind Advisory	5
Fire
Red Flag Warning	7
Fire Weather Watch	8
Fog and smoke
Dense Fog Advisory	2
Freezing Fog Advisory	5

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2012 2014

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.