Alert archive / California / Riverside County

Weather alerts in Riverside County, California, 2010

176 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Riverside County and its neighbors

Each county as a circle sized by its count in 2010. Tap one for its archive.

Alerts: 176
Warnings: 56
Watches: 25
Advisories: 87
Busiest month: January35 alerts
Busiest day: January 21, 201013 alerts

Over time

By month

Warning verification

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

1 of 1 tornado warnings covering Riverside County in 2010 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 17 minutes after it went out.

Riverside County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	1	1	0%	1	100%	17 min
Severe thunderstorm warnings	7	2	71%	4	75%	29 min
Flash flood warnings	19	6	68%	4	50%	194 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Phoenix, AZ: tornado warnings	4	2	50%	3	67%	9 min
NWS Phoenix, AZ: severe thunderstorm warnings	82	36	56%	113	69%	19 min
NWS Phoenix, AZ: flash flood warnings	38	11	71%	18	89%	36 min
NWS San Diego, CA: tornado warnings	4	2	50%	2	100%	15 min
NWS San Diego, CA: severe thunderstorm warnings	15	4	73%	18	33%	29 min
NWS San Diego, CA: flash flood warnings	29	9	69%	24	46%	84 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 13, 11:18 AM PST	Wind Advisory	SGX	50 hr
Jan 14, 9:00 AM PST	High Wind Warning	SGX	8 hr
Jan 17, 1:20 PM PST	Flash Flood Watch	SGX	30 hr
Jan 17, 1:31 PM PST	High Wind Watch	SGX	14 hr
Jan 18, 3:59 AM PST	High Wind Warning	SGX	15 hr
Jan 18, 3:59 AM PST	Wind Advisory	SGX	15 hr
Jan 18, 4:20 AM PST	Winter Storm Warning	SGX	14 hr
Jan 18, 1:35 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 18, 2:25 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 19, 3:20 AM PST	Winter Storm Warning	SGX	15 hr
Jan 19, 3:29 AM PST	Wind Advisory	SGX	15 hr
Jan 19, 3:42 AM PST	Flash Flood Watch	SGX	14 hr
Jan 19, 2:00 PM PST	Severe Thunderstorm Warning	SGX	45 min
Jan 19, 2:24 PM PST	Severe Thunderstorm Warning	SGX	51 min
Jan 20, 3:57 AM PST	Wind Advisory	SGX	17 hr
Jan 20, 4:06 AM PST	Winter Storm Warning	SGX	18 hr
Jan 20, 4:26 AM PST	Flash Flood Watch	SGX	16 hr
Jan 20, 12:03 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 20, 4:43 PM PST	Areal Flood Advisory	SGX	4 hr
Jan 21, 3:37 AM PST	Wind Advisory	SGX	38 hr
Jan 21, 3:58 AM PST	Winter Storm Warning	SGX	38 hr
Jan 21, 4:12 AM PST	Flash Flood Watch	SGX	38 hr
Jan 21, 6:34 AM PST	Areal Flood Advisory	PSR	101 min
Jan 21, 7:01 AM PST	Areal Flood Advisory	SGX	8 hr
Jan 21, 8:29 AM PST	Areal Flood Advisory	PSR	106 min
Jan 21, 10:56 AM PST	Flash Flood Warning	SGX	3 hr
Jan 21, 12:02 PM PST	Flash Flood Warning	PSR	3 hr
Jan 21, 12:51 PM PST	Flash Flood Warning	SGX	84 min
Jan 21, 3:12 PM PST	Tornado Watch	SPC	9 hr
Jan 21, 3:14 PM PST	Tornado Warning	PSR	46 min
Jan 21, 3:31 PM PST	Severe Thunderstorm Warning	PSR	59 min
Jan 22, 2:02 AM PST	Winter Weather Advisory	SGX	16 hr
Jan 22, 6:09 PM PST	Winter Weather Advisory	SGX	8 hr
Jan 26, 11:10 PM PST	Areal Flood Advisory	PSR	58 min
Jan 31, 7:38 AM PST	Dense Fog Advisory	SGX	74 min
Feb 4, 1:22 PM PST	Flash Flood Watch	SGX	54 hr
Feb 4, 1:22 PM PST	Winter Storm Watch	SGX	13 hr
Feb 5, 2:34 AM PST	Winter Storm Warning	SGX	41 hr
Feb 6, 5:06 AM PST	Flash Flood Warning	SGX	84 min
Feb 6, 6:31 AM PST	Flash Flood Warning	SGX	3 hr
Feb 8, 1:20 PM PST	Winter Storm Watch	SGX	13 hr
Feb 9, 2:31 AM PST	Winter Storm Warning	SGX	18 hr
Feb 9, 2:31 AM PST	Winter Weather Advisory	SGX	31 hr
Feb 9, 4:00 AM PST	Flash Flood Watch	SGX	22 hr
Feb 9, 3:01 PM PST	Areal Flood Advisory	SGX	3 hr
Feb 9, 6:31 PM PST	Areal Flood Advisory	SGX	3 hr
Feb 19, 1:25 PM PST	Winter Weather Advisory	SGX	16 hr
Feb 25, 8:30 PM PST	Winter Storm Watch	SGX	17 hr
Feb 26, 1:37 PM PST	Wind Advisory	SGX	21 hr
Feb 26, 1:39 PM PST	Winter Storm Warning	SGX	30 hr
Feb 27, 8:11 AM PST	Areal Flood Advisory	SGX	7 hr
Feb 27, 8:12 AM PST	Flash Flood Warning	SGX	65 min
Mar 5, 1:01 PM PST	Winter Weather Advisory	SGX	51 hr
Mar 8, 1:19 PM PST	Wind Advisory	SGX	54 hr
Mar 14, 3:17 AM PDT	Wind Advisory	SGX	9 hr
Mar 16, 3:39 AM PDT	Wind Advisory	SGX	8 hr
Mar 19, 2:15 AM PDT	Wind Advisory	SGX	11 hr
Mar 23, 2:45 AM PDT	Wind Advisory	SGX	7 hr
Mar 25, 1:00 PM PDT	Wind Advisory	SGX	19 hr
Mar 26, 9:11 PM PDT	Wind Advisory	SGX	20 hr
Mar 30, 2:21 AM PDT	Wind Advisory	SGX	43 hr
Mar 31, 1:19 PM PDT	Winter Weather Advisory	SGX	22 hr
Apr 4, 3:18 AM PDT	High Wind Watch	SGX	8 hr
Apr 4, 11:34 AM PDT	High Wind Warning	SGX	34 hr
Apr 4, 11:34 AM PDT	Wind Advisory	SGX	8 hr
Apr 6, 1:07 PM PDT	Wind Advisory	SGX	24 hr
Apr 11, 12:59 PM PDT	Wind Advisory	SGX	21 hr
Apr 19, 8:25 PM PDT	Wind Advisory	SGX	46 hr
Apr 21, 3:46 AM PDT	Winter Weather Advisory	SGX	31 hr
Apr 26, 7:46 PM PDT	High Wind Watch	SGX	7 hr
Apr 27, 3:06 AM PDT	High Wind Warning	SGX	48 hr
Apr 27, 3:06 AM PDT	Wind Advisory	SGX	24 hr
Apr 27, 3:13 PM PDT	Red Flag Warning	PSR	29 hr
Apr 28, 3:08 AM PDT	Wind Advisory	SGX	41 hr
Apr 29, 1:52 PM PDT	Red Flag Warning	PSR	6 hr
Apr 30, 1:15 PM PDT	Fire Weather Watch	PSR	24 hr
May 1, 1:33 PM PDT	Red Flag Warning	PSR	29 hr
May 7, 2:25 PM PDT	Fire Weather Watch	PSR	24 hr
May 8, 2:42 PM PDT	Red Flag Warning	PSR	32 hr
May 8, 6:40 PM PDT	Wind Advisory	SGX	32 hr
May 10, 1:58 PM PDT	Wind Advisory	SGX	27 hr
May 19, 1:23 PM PDT	Fire Weather Watch	SGX	24 hr
May 20, 1:35 PM PDT	Red Flag Warning	SGX	48 hr
May 21, 2:55 AM PDT	Wind Advisory	SGX	65 hr
May 21, 2:06 PM PDT	Fire Weather Watch	PSR	15 hr
May 21, 2:06 PM PDT	Fire Weather Watch	PSR	15 hr
May 22, 5:19 AM PDT	Red Flag Warning	PSR	14 hr
May 22, 5:19 AM PDT	Red Flag Warning	PSR	39 hr
May 29, 3:44 AM PDT	Wind Advisory	SGX	9 hr
Jun 8, 8:36 PM PDT	Wind Advisory	SGX	54 hr
Jul 15, 2:21 PM PDT	Special Weather Statement	PSR	24 min
Jul 15, 3:28 PM PDT	Special Weather Statement	PSR	32 min
Jul 15, 3:37 PM PDT	Flash Flood Warning	SGX	32 min
Aug 16, 2:37 PM PDT	Flash Flood Warning	SGX	66 min
Aug 25, 1:33 PM PDT	Flash Flood Warning	SGX	87 min
Aug 25, 6:58 PM PDT	Special Weather Statement	PSR	62 min
Aug 26, 10:53 AM PDT	Flash Flood Warning	SGX	37 min
Aug 26, 11:29 AM PDT	Flash Flood Warning	SGX	3 hr
Aug 26, 12:36 PM PDT	Flash Flood Warning	SGX	94 min
Aug 26, 2:36 PM PDT	Severe Thunderstorm Warning	SGX	54 min
Aug 26, 2:38 PM PDT	Areal Flood Advisory	PSR	112 min
Aug 26, 3:07 PM PDT	Flash Flood Warning	SGX	58 min
Aug 26, 3:32 PM PDT	Severe Thunderstorm Warning	SGX	22 min
Sep 30, 7:41 AM PDT	Red Flag Warning	SGX	14 hr
Oct 1, 1:21 PM PDT	Mesoscale Discussion	SPC	84 min
Oct 1, 3:02 PM PDT	Areal Flood Advisory	SGX	73 min
Oct 2, 4:43 PM PDT	Severe Thunderstorm Warning	SGX	51 min
Oct 3, 6:04 AM PDT	Special Weather Statement	PSR	41 min
Oct 4, 2:34 PM PDT	Mesoscale Discussion	SPC	116 min
Oct 19, 6:51 AM PDT	Areal Flood Advisory	SGX	4 hr
Oct 19, 10:39 AM PDT	Areal Flood Advisory	SGX	118 min
Oct 19, 11:46 AM PDT	Mesoscale Discussion	SPC	89 min
Oct 19, 2:17 PM PDT	Areal Flood Advisory	SGX	3 hr
Oct 19, 3:09 PM PDT	Special Weather Statement	PSR	66 min
Oct 19, 5:22 PM PDT	Areal Flood Advisory	SGX	3 hr
Oct 24, 5:02 PM PDT	Wind Advisory	SGX	19 hr
Oct 26, 12:48 PM PDT	Wind Advisory	SGX	13 hr
Oct 27, 2:06 AM PDT	High Wind Warning	SGX	11 hr
Oct 27, 2:06 AM PDT	Wind Advisory	SGX	16 hr
Oct 29, 1:30 PM PDT	Wind Advisory	SGX	23 hr
Nov 1, 11:26 PM PDT	Wind Advisory	SGX	11 hr
Nov 10, 1:00 PM PST	High Wind Warning	SGX	28 hr
Nov 10, 1:00 PM PST	Wind Advisory	SGX	28 hr
Nov 11, 5:21 PM PST	Wind Advisory	SGX	16 hr
Nov 12, 8:49 AM PST	Fire Weather Watch	SGX	6 hr
Nov 12, 9:19 AM PST	Wind Advisory	SGX	28 hr
Nov 12, 2:49 PM PST	Red Flag Warning	SGX	13 hr
Nov 14, 2:02 AM PST	Wind Advisory	SGX	9 hr
Nov 19, 4:40 AM PST	High Wind Watch	SGX	23 hr
Nov 19, 6:51 PM PST	Winter Storm Watch	SGX	9 hr
Nov 20, 3:59 AM PST	Wind Advisory	SGX	8 hr
Nov 20, 4:09 AM PST	Winter Storm Warning	SGX	8 hr
Nov 20, 12:08 PM PST	Winter Storm Warning	SGX	23 hr
Nov 21, 7:02 AM PST	Wind Advisory	SGX	11 hr
Nov 23, 3:01 AM PST	Wind Advisory	SGX	23 hr
Nov 24, 1:00 PM PST	Wind Advisory	SGX	24 hr
Nov 24, 11:34 PM PST	Frost Advisory	SGX	9 hr
Nov 25, 8:58 AM PST	Frost Advisory	SGX	24 hr
Nov 26, 8:54 PM PST	High Wind Watch	SGX	17 hr
Nov 27, 1:27 PM PST	High Wind Warning	SGX	21 hr
Nov 27, 1:27 PM PST	Wind Advisory	SGX	21 hr
Nov 28, 1:43 PM PST	Wind Advisory	SGX	22 hr
Nov 29, 2:47 AM PST	Frost Advisory	SGX	5 hr
Nov 29, 12:55 PM PST	Frost Advisory	SGX	19 hr
Dec 19, 9:52 AM PST	Wind Advisory	SGX	11 hr
Dec 19, 4:11 PM PST	Areal Flood Advisory	SGX	5 hr
Dec 19, 9:00 PM PST	Areal Flood Advisory	SGX	4 hr
Dec 20, 4:52 AM PST	Flash Flood Watch	SGX	61 hr
Dec 20, 2:26 PM PST	Areal Flood Advisory	SGX	6 hr
Dec 20, 3:14 PM PST	Wind Advisory	SGX	10 hr
Dec 20, 3:25 PM PST	Flash Flood Warning	SGX	7 hr
Dec 20, 5:56 PM PST	Areal Flood Advisory	SGX	35 hr
Dec 20, 8:19 PM PST	Areal Flood Advisory	SGX	6 hr
Dec 20, 10:33 PM PST	Areal Flood Advisory	SGX	4 hr
Dec 21, 4:18 AM PST	Winter Storm Warning	SGX	38 hr
Dec 21, 4:18 AM PST	Winter Weather Advisory	SGX	14 hr
Dec 21, 8:05 AM PST	Areal Flood Advisory	SGX	12 hr
Dec 21, 12:56 PM PST	Wind Advisory	SGX	24 hr
Dec 21, 11:18 PM PST	Areal Flood Advisory	SGX	6 hr
Dec 22, 4:46 AM PST	Areal Flood Advisory	PSR	3 hr
Dec 22, 4:59 AM PST	Areal Flood Advisory	SGX	8 hr
Dec 22, 6:29 AM PST	Flash Flood Warning	PSR	3 hr
Dec 22, 7:34 AM PST	Flash Flood Warning	SGX	116 min
Dec 22, 9:22 AM PST	Flash Flood Warning	PSR	3 hr
Dec 22, 9:27 AM PST	Flash Flood Warning	SGX	2 hr
Dec 22, 12:46 PM PST	Areal Flood Advisory	SGX	6 hr
Dec 22, 3:19 PM PST	Flash Flood Warning	SGX	116 min
Dec 22, 3:43 PM PST	Severe Thunderstorm Warning	SGX	53 min
Dec 25, 9:41 PM PST	Areal Flood Advisory	SGX	2 hr
Dec 28, 2:18 AM PST	High Wind Watch	SGX	24 hr
Dec 28, 1:00 PM PST	Winter Storm Watch	SGX	4 hr
Dec 28, 5:20 PM PST	High Wind Warning	SGX	33 hr
Dec 28, 5:20 PM PST	Winter Storm Warning	SGX	9 hr
Dec 29, 2:19 AM PST	Wind Advisory	SGX	24 hr
Dec 29, 2:32 AM PST	Winter Storm Warning	SGX	11 hr
Dec 30, 2:47 AM PST	Frost Advisory	SGX	30 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	7
Tornado Warning	1
Tornado Watch	1
Mesoscale Discussion	3
Special Weather Statement	5
Flooding
Flash Flood Warning	19
Flash Flood Watch	7
Areal Flood Advisory	29
Winter
Winter Storm Warning	12
Winter Storm Watch	5
Winter Weather Advisory	8
Cold
Frost Advisory	5
Wind and dust
High Wind Warning	8
High Wind Watch	6
Wind Advisory	44
Fire
Red Flag Warning	9
Fire Weather Watch	6
Fog and smoke
Dense Fog 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 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.