Alert archive / California / Sierra County

Weather alerts in Sierra County, California, 2010

102 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 102
Warnings: 22
Watches: 12
Advisories: 45
Busiest month: July17 alerts
Busiest day: July 25, 20105 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, 2010

	Warnings	With a report	False alarm ratio
Tornado warnings	0
Severe thunderstorm warnings	4	0	100%
Flash flood warnings	3	0	100%

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Reno, NV: severe thunderstorm warnings	26	2	92%	8	38%	18 min
NWS Reno, NV: flash flood warnings	19	2	89%	3	67%	20 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, 8:54 PM PST	Freezing Fog Advisory	REV	34 hr
Jan 9, 3:42 PM PST	Freezing Fog Advisory	REV	21 hr
Jan 10, 6:39 PM PST	Dense Fog Advisory	REV	17 hr
Jan 11, 3:37 PM PST	Winter Weather Advisory	REV	42 hr
Jan 12, 4:34 PM PST	Mesoscale Discussion	SPC	4 hr
Jan 13, 12:17 AM PST	Mesoscale Discussion	SPC	4 hr
Jan 15, 3:00 PM PST	Winter Storm Watch	REV	24 hr
Jan 16, 2:59 PM PST	Winter Storm Warning	REV	58 hr
Jan 19, 2:21 AM PST	Winter Storm Watch	REV	25 hr
Jan 19, 2:21 AM PST	Winter Weather Advisory	REV	20 hr
Jan 19, 3:34 PM PST	Winter Storm Warning	REV	60 hr
Jan 20, 8:28 AM PST	Mesoscale Discussion	SPC	4 hr
Jan 21, 3:06 AM PST	Winter Weather Advisory	REV	25 hr
Jan 24, 3:14 PM PST	Winter Weather Advisory	REV	37 hr
Feb 4, 2:32 PM PST	Winter Weather Advisory	REV	22 hr
Feb 20, 2:23 PM PST	Winter Weather Advisory	REV	8 hr
Feb 20, 9:53 PM PST	Winter Storm Warning	REV	17 hr
Feb 21, 8:23 PM PST	Freezing Fog Advisory	REV	10 hr
Feb 22, 2:23 PM PST	Winter Weather Advisory	REV	44 hr
Mar 2, 2:17 PM PST	Winter Weather Advisory	REV	36 hr
Mar 8, 10:03 AM PST	Winter Weather Advisory	REV	12 hr
Mar 27, 1:22 PM PDT	High Wind Watch	REV	23 hr
Mar 28, 3:57 AM PDT	High Wind Warning	REV	59 hr
Mar 29, 11:12 AM PDT	Winter Weather Advisory	REV	28 hr
Apr 1, 3:36 PM PDT	High Wind Warning	REV	28 hr
Apr 1, 3:36 PM PDT	Wind Advisory	REV	31 hr
Apr 4, 3:51 AM PDT	Winter Weather Advisory	REV	29 hr
Apr 12, 2:34 AM PDT	Winter Weather Advisory	REV	8 hr
Apr 26, 4:16 AM PDT	Wind Advisory	REV	34 hr
Apr 28, 3:57 AM PDT	Winter Weather Advisory	REV	5 hr
May 2, 2:18 PM PDT	Wind Advisory	REV	30 hr
May 30, 3:21 PM PDT	Lake Wind Advisory	REV	29 hr
Jun 3, 2:42 PM PDT	Lake Wind Advisory	REV	30 hr
Jun 8, 2:08 PM PDT	Lake Wind Advisory	REV	31 hr
Jun 18, 2:53 PM PDT	Lake Wind Advisory	REV	31 hr
Jul 6, 7:18 PM PDT	Special Weather Statement	REV	27 min
Jul 8, 3:27 PM PDT	Special Weather Statement	STO	33 min
Jul 9, 1:56 PM PDT	Special Weather Statement	REV	64 min
Jul 9, 2:20 PM PDT	Severe Thunderstorm Warning	REV	40 min
Jul 9, 3:07 PM PDT	Special Weather Statement	REV	38 min
Jul 23, 9:31 AM PDT	Fire Weather Watch	REV	32 hr
Jul 24, 9:21 AM PDT	Red Flag Warning	REV	57 hr
Jul 24, 4:58 PM PDT	Special Weather Statement	REV	62 min
Jul 24, 6:00 PM PDT	Special Weather Statement	REV	45 min
Jul 24, 6:28 PM PDT	Severe Thunderstorm Warning	REV	32 min
Jul 24, 7:15 PM PDT	Flash Flood Warning	REV	76 min
Jul 24, 7:29 PM PDT	Special Weather Statement	REV	61 min
Jul 25, 12:04 PM PDT	Special Weather Statement	REV	26 min
Jul 26, 12:54 PM PDT	Special Weather Statement	REV	36 min
Jul 26, 1:22 PM PDT	Severe Thunderstorm Warning	REV	38 min
Jul 26, 2:47 PM PDT	Severe Thunderstorm Warning	REV	43 min
Jul 26, 3:30 PM PDT	Special Weather Statement	REV	45 min
Aug 7, 3:38 PM PDT	Special Weather Statement	REV	37 min
Aug 7, 4:21 PM PDT	Flash Flood Warning	REV	50 min
Aug 7, 5:31 PM PDT	Special Weather Statement	REV	29 min
Aug 8, 8:15 AM PDT	Flash Flood Watch	REV	13 hr
Aug 8, 2:33 PM PDT	Special Weather Statement	REV	57 min
Aug 8, 6:37 PM PDT	Special Weather Statement	REV	38 min
Aug 15, 3:12 PM PDT	Fire Weather Watch	REV	39 hr
Aug 16, 9:36 AM PDT	Red Flag Warning	REV	39 hr
Aug 16, 2:57 PM PDT	Lake Wind Advisory	REV	34 hr
Aug 19, 9:35 AM PDT	Fire Weather Watch	REV	22 hr
Aug 20, 7:40 AM PDT	Red Flag Warning	REV	39 hr
Aug 20, 8:21 AM PDT	Lake Wind Advisory	REV	52 hr
Aug 24, 11:01 AM PDT	Fire Weather Watch	REV	52 hr
Aug 25, 10:36 AM PDT	Red Flag Warning	REV	37 hr
Aug 25, 3:38 PM PDT	Lake Wind Advisory	REV	29 hr
Aug 26, 10:15 AM PDT	Red Flag Warning	REV	53 hr
Sep 2, 1:00 PM PDT	Fire Weather Watch	REV	22 hr
Sep 6, 1:46 PM PDT	Red Flag Warning	REV	33 hr
Oct 2, 2:20 PM PDT	Flash Flood Warning	REV	85 min
Oct 4, 4:19 AM PDT	Areal Flood Advisory	REV	4 hr
Oct 4, 5:14 AM PDT	Areal Flood Advisory	STO	4 hr
Oct 4, 5:27 PM PDT	Special Weather Statement	REV	48 min
Oct 4, 5:38 PM PDT	Areal Flood Advisory	REV	4 hr
Oct 4, 5:52 PM PDT	Special Weather Statement	REV	23 min
Oct 5, 7:57 PM PDT	Special Weather Statement	REV	33 min
Oct 7, 8:32 PM PDT	Dense Fog Advisory	REV	12 hr
Oct 24, 9:23 AM PDT	Areal Flood Advisory	REV	12 hr
Oct 24, 12:49 PM PDT	Areal Flood Advisory	REV	8 hr
Oct 24, 3:36 PM PDT	Areal Flood Warning	REV	5 hr
Oct 24, 4:01 PM PDT	Areal Flood Advisory	STO	3 hr
Nov 6, 2:36 PM PDT	Winter Weather Advisory	REV	37 hr
Nov 17, 3:12 PM PST	Wind Advisory	REV	49 hr
Nov 17, 3:37 PM PST	Winter Storm Watch	REV	23 hr
Nov 18, 3:00 PM PST	Winter Storm Warning	REV	3 days
Nov 20, 8:39 PM PST	Mesoscale Discussion	SPC	4 hr
Nov 21, 3:09 AM PST	Winter Storm Watch	REV	34 hr
Nov 21, 3:33 PM PST	Winter Weather Advisory	REV	18 hr
Nov 22, 3:31 AM PST	Wind Advisory	REV	24 hr
Nov 22, 5:02 AM PST	Winter Storm Warning	REV	35 hr
Nov 26, 2:40 AM PST	Winter Weather Advisory	REV	49 hr
Dec 5, 3:45 AM PST	Winter Weather Advisory	REV	27 hr
Dec 7, 12:43 PM PST	Wind Advisory	REV	27 hr
Dec 13, 3:11 PM PST	Wind Advisory	REV	28 hr
Dec 15, 3:33 PM PST	Winter Storm Watch	REV	25 hr
Dec 16, 4:08 PM PST	Winter Storm Warning	REV	4 days
Dec 19, 9:08 AM PST	Mesoscale Discussion	SPC	5 hr
Dec 23, 3:59 AM PST	Freezing Fog Advisory	REV	8 hr
Dec 28, 4:34 AM PST	Winter Weather Advisory	REV	39 hr
Dec 28, 1:22 PM PST	Areal Flood Advisory	STO	14 hr
Dec 28, 4:58 PM PST	Mesoscale Discussion	SPC	6 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	4
Mesoscale Discussion	6
Special Weather Statement	17
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
Flash Flood Watch	1
Areal Flood Advisory	7
Winter
Winter Storm Warning	6
Winter Storm Watch	5
Winter Weather Advisory	18
Wind and dust
High Wind Warning	2
High Wind Watch	1
Lake Wind Advisory	7
Wind Advisory	7
Fire
Red Flag Warning	6
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	2
Freezing Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.