Alert archive / California / Riverside County

Weather alerts in Riverside County, California, 2008

236 weather alerts in 2008, 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 2008. Tap one for its archive.

Alerts: 236
Warnings: 89
Watches: 56
Advisories: 91
Busiest month: December38 alerts
Busiest day: May 22, 20088 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 4 tornado warnings covering Riverside County in 2008 had a tornado report inside them; 0 of 2 tornado reports fell inside a warning.

Riverside County, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	0	100%	2	0%
Severe thunderstorm warnings	12	1	92%	2	50%	22 min
Flash flood warnings	18	10	44%	17	65%	85 min

Each office's whole area, 2008

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS San Diego, CA: tornado warnings	6	0	100%	4	0%
NWS San Diego, CA: severe thunderstorm warnings	12	2	83%	6	50%	29 min
NWS San Diego, CA: flash flood warnings	56	16	71%	48	71%	103 min
NWS Phoenix, AZ: severe thunderstorm warnings	141	25	82%	52	71%	22 min
NWS Phoenix, AZ: flash flood warnings	38	12	68%	28	68%	93 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 1, 12:49 AM PST	High Wind Warning	SGX	9 hr
Jan 1, 2:46 AM PST	Red Flag Warning	PSR	14 hr
Jan 3, 1:32 PM PST	Flash Flood Watch	SGX	52 hr
Jan 3, 1:32 PM PST	High Wind Watch	SGX	24 hr
Jan 4, 1:20 PM PST	Wind Advisory	SGX	67 hr
Jan 4, 7:54 PM PST	Flash Flood Warning	SGX	9 hr
Jan 5, 5:05 AM PST	Heavy Snow Warning	SGX	51 hr
Jan 5, 5:18 AM PST	Dense Fog Advisory	SGX	51 hr
Jan 6, 3:55 AM PST	Flash Flood Watch	SGX	28 hr
Jan 6, 10:53 PM PST	Flash Flood Warning	SGX	2 hr
Jan 13, 3:45 AM PST	High Wind Watch	SGX	7 hr
Jan 13, 3:45 AM PST	Wind Advisory	SGX	38 hr
Jan 13, 10:21 AM PST	High Wind Warning	SGX	26 hr
Jan 14, 7:45 PM PST	High Wind Watch	SGX	17 hr
Jan 15, 3:26 AM PST	Fire Weather Watch	PSR	25 hr
Jan 15, 1:09 PM PST	High Wind Warning	SGX	47 hr
Jan 15, 1:09 PM PST	Wind Advisory	SGX	3 days
Jan 16, 4:21 AM PST	Red Flag Warning	PSR	14 hr
Jan 16, 9:04 PM PST	Red Flag Warning	PSR	16 hr
Jan 17, 10:48 AM PST	High Wind Watch	SGX	5 hr
Jan 25, 1:32 PM PST	Flash Flood Watch	SGX	67 hr
Jan 26, 12:31 PM PST	Winter Storm Warning	SGX	45 hr
Jan 26, 1:02 PM PST	Wind Advisory	SGX	33 hr
Jan 27, 7:00 AM PST	Flash Flood Warning	SGX	4 hr
Jan 28, 9:43 AM PST	Snow Advisory	SGX	4 hr
Jan 28, 9:52 AM PST	Wind Advisory	SGX	10 hr
Jan 29, 8:40 PM PST	High Wind Warning	SGX	15 hr
Jan 29, 8:40 PM PST	Wind Advisory	SGX	21 hr
Feb 1, 4:24 PM PST	High Wind Watch	SGX	28 hr
Feb 2, 3:50 AM PST	Winter Storm Watch	SGX	17 hr
Feb 2, 8:52 PM PST	High Wind Warning	SGX	24 hr
Feb 2, 9:10 PM PST	Winter Storm Warning	SGX	24 hr
Feb 3, 2:38 AM PST	Wind Advisory	SGX	14 hr
Feb 3, 4:35 PM PST	Snow and Blowing Snow Advisory	SGX	17 hr
Feb 3, 8:44 PM PST	Wind Advisory	SGX	5 hr
Feb 4, 12:27 AM PST	High Surf Advisory	SGX	14 hr
Feb 5, 3:20 AM PST	Wind Advisory	SGX	6 hr
Feb 12, 1:25 PM PST	Fire Weather Watch	PSR	24 hr
Feb 13, 4:26 AM PST	High Wind Watch	SGX	13 hr
Feb 13, 4:26 AM PST	Wind Advisory	SGX	23 hr
Feb 13, 1:33 PM PST	Red Flag Warning	PSR	29 hr
Feb 13, 5:02 PM PST	High Wind Warning	SGX	10 hr
Feb 14, 1:02 PM PST	High Wind Warning	SGX	23 hr
Feb 14, 1:02 PM PST	Wind Advisory	SGX	23 hr
Feb 15, 11:56 AM PST	Frost Advisory	SGX	21 hr
Feb 20, 3:19 AM PST	Wind Advisory	SGX	18 hr
Feb 22, 9:05 AM PST	Wind Advisory	SGX	16 hr
Feb 22, 2:45 PM PST	High Wind Watch	SGX	37 hr
Feb 23, 3:27 AM PST	Flash Flood Watch	SGX	30 hr
Feb 23, 11:08 AM PST	Winter Storm Watch	SGX	4 hr
Feb 23, 1:17 PM PST	High Wind Warning	SGX	31 hr
Feb 23, 2:51 PM PST	Winter Storm Warning	SGX	23 hr
Feb 24, 4:03 AM PST	Wind Advisory	SGX	16 hr
Feb 26, 2:16 AM PST	Wind Advisory	SGX	10 hr
Mar 1, 5:20 AM PST	Fire Weather Watch	PSR	8 hr
Mar 1, 12:06 PM PST	High Wind Watch	SGX	21 hr
Mar 1, 1:17 PM PST	Red Flag Warning	PSR	30 hr
Mar 1, 6:52 PM PST	Wind Advisory	SGX	43 hr
Mar 2, 3:28 AM PST	High Wind Warning	SGX	34 hr
Mar 4, 1:47 PM PST	Fire Weather Watch	PSR	12 hr
Mar 5, 2:00 AM PST	Red Flag Warning	PSR	18 hr
Mar 5, 3:45 AM PST	Wind Advisory	SGX	24 hr
Mar 8, 1:33 PM PST	Wind Advisory	SGX	22 hr
Mar 12, 8:53 AM PDT	High Wind Watch	SGX	19 hr
Mar 13, 4:12 AM PDT	High Wind Warning	SGX	37 hr
Mar 13, 4:12 AM PDT	Wind Advisory	SGX	70 hr
Mar 14, 4:28 AM PDT	Red Flag Warning	PSR	16 hr
Mar 14, 1:59 PM PDT	High Wind Watch	SGX	3 hr
Mar 14, 1:59 PM PDT	Wind Advisory	SGX	30 hr
Mar 15, 9:31 AM PDT	Snow and Blowing Snow Advisory	SGX	17 hr
Mar 16, 2:58 AM PDT	Snow Advisory	SGX	7 hr
Mar 16, 8:43 PM PDT	Wind Advisory	SGX	16 hr
Mar 29, 3:37 AM PDT	Wind Advisory	SGX	44 hr
Apr 2, 8:33 AM PDT	Wind Advisory	SGX	13 hr
Apr 7, 5:27 AM PDT	Fire Weather Watch	PSR	25 hr
Apr 8, 6:33 AM PDT	Red Flag Warning	PSR	14 hr
Apr 8, 4:22 PM PDT	Wind Advisory	SGX	18 hr
Apr 11, 1:33 PM PDT	Wind Advisory	SGX	24 hr
Apr 13, 3:30 PM PDT	Fire Weather Watch	PSR	24 hr
Apr 14, 3:26 PM PDT	Red Flag Warning	PSR	30 hr
Apr 15, 2:50 AM PDT	Wind Advisory	SGX	17 hr
Apr 16, 4:58 AM PDT	Red Flag Warning	PSR	12 hr
Apr 17, 4:51 AM PDT	Fire Weather Watch	PSR	48 hr
Apr 19, 1:24 AM PDT	Wind Advisory	SGX	22 hr
Apr 23, 1:12 AM PDT	Wind Advisory	SGX	23 hr
Apr 28, 2:27 PM PDT	Fire Weather Watch	PSR	39 hr
Apr 29, 1:54 PM PDT	Red Flag Warning	PSR	30 hr
Apr 30, 12:44 AM PDT	Wind Advisory	SGX	28 hr
Apr 30, 5:56 AM PDT	Dense Fog Advisory	SGX	4 hr
May 1, 4:55 AM PDT	Red Flag Warning	PSR	13 hr
May 6, 10:38 PM PDT	Dense Fog Advisory	SGX	10 hr
May 10, 2:52 PM PDT	Fire Weather Watch	PSR	9 min
May 10, 3:01 PM PDT	Fire Weather Watch	PSR	39 hr
May 12, 2:33 AM PDT	Wind Advisory	SGX	23 hr
May 12, 5:53 AM PDT	Red Flag Warning	PSR	15 hr
May 12, 2:43 PM PDT	Red Flag Warning	PSR	26 hr
May 13, 8:21 AM PDT	Wind Advisory	SGX	5 hr
May 15, 2:58 AM PDT	Wind Advisory	SGX	11 hr
May 15, 3:07 AM PDT	Fire Weather Watch	SGX	23 hr
May 15, 3:07 AM PDT	Red Flag Warning	SGX	15 hr
May 15, 3:46 AM PDT	Red Flag Warning	PSR	15 hr
May 19, 3:34 AM PDT	Fire Weather Watch	PSR	35 hr
May 19, 1:50 PM PDT	Fire Weather Watch	SGX	14 hr
May 19, 3:08 PM PDT	Fire Weather Watch	PSR	14 hr
May 20, 3:01 AM PDT	Red Flag Warning	PSR	20 hr
May 20, 3:55 AM PDT	Red Flag Warning	SGX	17 hr
May 20, 4:03 AM PDT	Wind Advisory	SGX	38 hr
May 20, 8:33 AM PDT	High Wind Watch	SGX	13 hr
May 20, 3:01 PM PDT	Red Flag Warning	PSR	30 hr
May 21, 3:31 AM PDT	Red Flag Warning	SGX	14 hr
May 22, 12:01 PM PDT	Flash Flood Warning	SGX	59 min
May 22, 12:05 PM PDT	Severe Thunderstorm Warning	SGX	40 min
May 22, 12:55 PM PDT	Flash Flood Warning	SGX	2 hr
May 22, 3:46 PM PDT	Severe Thunderstorm Warning	SGX	44 min
May 22, 3:50 PM PDT	Flash Flood Warning	SGX	85 min
May 22, 4:29 PM PDT	Severe Thunderstorm Warning	SGX	46 min
May 22, 4:45 PM PDT	Tornado Warning	SGX	15 min
May 22, 4:56 PM PDT	Tornado Warning	SGX	34 min
May 22, 5:01 PM PDT	Flash Flood Warning	SGX	89 min
May 22, 5:16 PM PDT	Tornado Warning	SGX	29 min
May 22, 5:34 PM PDT	Tornado Warning	SGX	26 min
May 22, 6:18 PM PDT	Flash Flood Warning	SGX	87 min
May 23, 11:13 AM PDT	Areal Flood Advisory	SGX	4 hr
May 23, 1:53 PM PDT	Dense Fog Advisory	SGX	19 hr
May 23, 3:18 PM PDT	Areal Flood Advisory	SGX	4 hr
Jun 2, 9:10 PM PDT	Wind Advisory	SGX	41 hr
Jun 3, 2:30 PM PDT	Fire Weather Watch	PSR	15 hr
Jun 4, 5:56 AM PDT	Red Flag Warning	PSR	16 hr
Jun 4, 9:39 AM PDT	High Wind Warning	SGX	17 hr
Jun 10, 1:35 PM PDT	Wind Advisory	SGX	12 hr
Jun 19, 3:54 PM PDT	Excessive Heat Warning	SGX	28 hr
Jun 20, 2:44 PM PDT	Excessive Heat Warning	SGX	27 hr
Jul 10, 2:54 PM PDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 10, 9:33 PM PDT	Severe Thunderstorm Warning	PSR	42 min
Jul 19, 9:05 PM PDT	Flash Flood Watch	SGX	22 hr
Jul 20, 6:54 AM PDT	Areal Flood Advisory	SGX	3 hr
Jul 20, 10:29 AM PDT	Areal Flood Advisory	SGX	2 hr
Jul 20, 2:34 PM PDT	Areal Flood Advisory	PSR	116 min
Aug 3, 2:54 PM PDT	Flash Flood Warning	SGX	51 min
Aug 4, 3:01 AM PDT	Flash Flood Watch	SGX	16 hr
Aug 4, 12:56 PM PDT	Areal Flood Advisory	PSR	109 min
Aug 4, 1:30 PM PDT	Severe Thunderstorm Warning	PSR	60 min
Aug 4, 1:55 PM PDT	Flash Flood Warning	SGX	95 min
Aug 4, 2:53 PM PDT	Severe Thunderstorm Warning	SGX	52 min
Aug 4, 3:38 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 4, 3:58 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 4, 4:01 PM PDT	Severe Thunderstorm Warning	PSR	59 min
Aug 5, 8:36 AM PDT	Flash Flood Watch	SGX	8 hr
Aug 7, 6:36 AM PDT	Flash Flood Watch	SGX	10 hr
Aug 7, 10:20 AM PDT	Flash Flood Warning	SGX	3 hr
Aug 7, 1:34 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 7, 2:09 PM PDT	Areal Flood Advisory	PSR	111 min
Aug 7, 4:16 PM PDT	Severe Thunderstorm Warning	PSR	59 min
Aug 8, 2:14 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 8, 5:48 PM PDT	Severe Thunderstorm Warning	PSR	57 min
Aug 8, 6:01 PM PDT	Areal Flood Advisory	PSR	119 min
Aug 8, 6:58 PM PDT	Areal Flood Advisory	PSR	2 hr
Aug 9, 4:11 PM PDT	Areal Flood Advisory	PSR	88 min
Aug 15, 9:52 AM PDT	Flash Flood Watch	SGX	8 hr
Aug 25, 8:07 AM PDT	Flash Flood Watch	SGX	11 hr
Aug 25, 12:08 PM PDT	Flash Flood Warning	SGX	6 hr
Aug 25, 1:08 PM PDT	Flash Flood Warning	PSR	112 min
Aug 25, 9:30 PM PDT	Severe Thunderstorm Warning	PSR	60 min
Aug 26, 3:23 AM PDT	Flash Flood Watch	SGX	10 hr
Aug 29, 8:50 PM PDT	Flash Flood Watch	SGX	21 hr
Aug 30, 5:54 AM PDT	Areal Flood Advisory	PSR	2 hr
Aug 30, 8:10 AM PDT	Areal Flood Advisory	PSR	110 min
Aug 30, 1:33 PM PDT	Flash Flood Warning	SGX	3 hr
Aug 30, 2:38 PM PDT	Flash Flood Warning	SGX	96 min
Sep 10, 3:05 PM PDT	Severe Thunderstorm Warning	PSR	55 min
Sep 11, 3:31 PM PDT	Severe Thunderstorm Warning	PSR	44 min
Sep 15, 9:48 AM PDT	Red Flag Warning	SGX	9 hr
Oct 3, 1:43 PM PDT	Wind Advisory	SGX	37 hr
Oct 9, 9:52 PM PDT	High Wind Watch	SGX	16 hr
Oct 10, 4:20 AM PDT	Fire Weather Watch	PSR	11 hr
Oct 10, 4:20 AM PDT	Red Flag Warning	PSR	17 hr
Oct 10, 1:27 PM PDT	Wind Advisory	SGX	20 hr
Oct 11, 4:30 AM PDT	Red Flag Warning	PSR	10 hr
Oct 11, 9:02 AM PDT	Fire Weather Watch	SGX	19 hr
Oct 12, 2:56 AM PDT	High Wind Warning	SGX	57 hr
Oct 12, 2:56 AM PDT	Wind Advisory	SGX	57 hr
Oct 12, 3:45 AM PDT	Red Flag Warning	SGX	6 days
Oct 12, 2:42 PM PDT	Red Flag Warning	PSR	29 hr
Oct 14, 11:57 AM PDT	Wind Advisory	SGX	7 hr
Oct 21, 8:48 AM PDT	Red Flag Warning	SGX	8 days
Oct 21, 9:07 PM PDT	Wind Advisory	SGX	20 hr
Nov 8, 8:37 AM PST	High Wind Watch	SGX	9 hr
Nov 8, 6:01 PM PST	Wind Advisory	SGX	24 hr
Nov 11, 12:54 PM PST	Fire Weather Watch	SGX	48 hr
Nov 13, 12:55 PM PST	Red Flag Warning	SGX	3 days
Nov 13, 1:17 PM PST	High Wind Watch	SGX	14 hr
Nov 13, 1:17 PM PST	Wind Advisory	SGX	49 hr
Nov 14, 5:45 AM PST	High Wind Warning	SGX	32 hr
Nov 23, 6:39 AM PST	Dense Fog Advisory	SGX	2 hr
Nov 24, 1:00 PM PST	Flash Flood Watch	SGX	3 days
Nov 26, 12:40 AM PST	Flash Flood Warning	SGX	5 hr
Nov 26, 12:55 AM PST	Areal Flood Advisory	SGX	5 hr
Nov 26, 5:56 PM PST	Areal Flood Advisory	SGX	3 hr
Dec 1, 6:13 PM PST	Dense Fog Advisory	SGX	15 hr
Dec 3, 4:05 AM PST	Dense Fog Advisory	SGX	5 hr
Dec 4, 1:55 AM PST	Dense Fog Advisory	SGX	5 hr
Dec 5, 6:44 AM PST	Wind Advisory	SGX	7 hr
Dec 8, 1:19 PM PST	High Wind Watch	SGX	7 hr
Dec 8, 1:39 PM PST	Wind Advisory	SGX	32 hr
Dec 8, 8:32 PM PST	High Wind Warning	SGX	21 hr
Dec 10, 7:15 AM PST	Wind Advisory	SGX	6 hr
Dec 13, 2:37 AM PST	Wind Advisory	SGX	21 hr
Dec 13, 3:56 PM PST	High Wind Warning	SGX	8 hr
Dec 14, 5:18 AM PST	High Wind Warning	SGX	37 hr
Dec 14, 5:18 AM PST	Wind Advisory	SGX	37 hr
Dec 14, 5:33 AM PST	Flash Flood Watch	SGX	36 hr
Dec 14, 5:38 AM PST	Winter Storm Warning	SGX	36 hr
Dec 15, 6:42 AM PST	Flash Flood Warning	SGX	6 hr
Dec 15, 7:11 AM PST	Areal Flood Advisory	SGX	5 hr
Dec 15, 10:30 AM PST	Areal Flood Advisory	SGX	3 hr
Dec 15, 1:47 PM PST	Areal Flood Advisory	SGX	88 min
Dec 15, 6:16 PM PST	Flash Flood Watch	SGX	6 hr
Dec 16, 3:55 AM PST	Winter Storm Watch	SGX	5 hr
Dec 16, 8:45 AM PST	Winter Storm Warning	SGX	43 hr
Dec 16, 9:14 AM PST	Flash Flood Watch	SGX	35 hr
Dec 17, 8:39 AM PST	Wind Advisory	SGX	10 hr
Dec 17, 10:59 AM PST	Flash Flood Warning	SGX	6 hr
Dec 17, 12:35 PM PST	High Wind Warning	SGX	6 hr
Dec 17, 8:16 PM PST	Frost Advisory	SGX	38 hr
Dec 19, 12:42 PM PST	Frost Advisory	SGX	20 hr
Dec 20, 5:30 PM PST	Frost Advisory	SGX	15 hr
Dec 21, 1:05 PM PST	Wind Advisory	SGX	38 hr
Dec 21, 1:52 PM PST	Winter Storm Watch	SGX	14 hr
Dec 23, 4:23 AM PST	High Wind Watch	SGX	23 hr
Dec 23, 4:48 AM PST	Flash Flood Watch	SGX	43 hr
Dec 24, 3:27 AM PST	Winter Storm Warning	SGX	23 hr
Dec 24, 3:38 AM PST	High Wind Warning	SGX	47 hr
Dec 24, 3:38 AM PST	Wind Advisory	SGX	21 hr
Dec 25, 4:32 PM PST	Areal Flood Advisory	SGX	98 min
Dec 26, 1:31 PM PST	Frost Advisory	SGX	19 hr
Dec 27, 12:31 PM PST	Frost Advisory	SGX	20 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	12
Tornado Warning	4
Severe Thunderstorm Watch	1
Flooding
Flash Flood Warning	18
Flash Flood Watch	17
Areal Flood Advisory	22
Winter
Heavy Snow Warning	1
Winter Storm Warning	6
Winter Storm Watch	4
Snow Advisory	2
Snow and Blowing Snow Advisory	2
Heat
Excessive Heat Warning	2
Cold
Frost Advisory	6
Wind and dust
High Wind Warning	18
High Wind Watch	16
Wind Advisory	50
Fire
Red Flag Warning	28
Fire Weather Watch	18
Fog and smoke
Dense Fog Advisory	8
Coast and beach
High Surf 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 2007 2009

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.