Alert archive / California / Riverside County

Weather alerts in Riverside County, California, 2017

229 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 229
Warnings: 79
Watches: 29
Advisories: 106
Busiest month: August46 alerts
Busiest day: August 3, 201716 alerts

Over time

By month

Warning verification

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

Riverside County, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	19	4	79%	18	28%	24 min
Flash flood warnings	21	7	67%	27	48%	61 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS San Diego, CA: tornado warnings	0			1	0%
NWS San Diego, CA: severe thunderstorm warnings	25	10	60%	45	47%	26 min
NWS San Diego, CA: flash flood warnings	23	12	48%	82	48%	79 min
NWS Phoenix, AZ: tornado warnings	0			1	0%
NWS Phoenix, AZ: severe thunderstorm warnings	79	28	65%	92	49%	17 min
NWS Phoenix, AZ: flash flood warnings	75	37	51%	72	81%	86 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
Dec 31, 6:06 PM PST	Areal Flood Advisory	SGX	114 min
Dec 31, 9:35 PM PST	Areal Flood Advisory	PSR	3 hr
Jan 1, 3:16 AM PST	Wind Advisory	SGX	32 hr
Jan 4, 2:03 PM PST	Wind Advisory	SGX	38 hr
Jan 8, 3:49 AM PST	Wind Advisory	SGX	40 hr
Jan 10, 1:13 PM PST	Wind Advisory	SGX	30 hr
Jan 11, 1:07 PM PST	Winter Storm Warning	SGX	33 hr
Jan 12, 11:02 AM PST	Areal Flood Advisory	SGX	5 hr
Jan 12, 1:09 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 12, 3:45 PM PST	Areal Flood Advisory	SGX	6 hr
Jan 12, 4:00 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 12, 4:05 PM PST	Areal Flood Advisory	SGX	3 hr
Jan 17, 9:52 PM PST	Winter Storm Watch	SGX	16 hr
Jan 17, 9:52 PM PST	Winter Weather Advisory	SGX	16 hr
Jan 17, 9:58 PM PST	High Wind Watch	SGX	41 hr
Jan 17, 9:58 PM PST	Wind Advisory	SGX	4 days
Jan 18, 1:31 PM PST	Winter Storm Warning	SGX	64 hr
Jan 19, 6:21 AM PST	Areal Flood Advisory	SGX	3 hr
Jan 19, 2:46 PM PST	Flash Flood Watch	SGX	28 hr
Jan 19, 2:55 PM PST	High Wind Warning	SGX	51 hr
Jan 19, 2:55 PM PST	Wind Advisory	SGX	38 hr
Jan 20, 10:41 AM PST	Areal Flood Advisory	SGX	9 hr
Jan 20, 1:20 PM PST	Areal Flood Advisory	SGX	6 hr
Jan 20, 2:03 PM PST	Areal Flood Advisory	SGX	5 hr
Jan 21, 4:36 AM PST	High Wind Warning	SGX	48 hr
Jan 21, 4:36 AM PST	Wind Advisory	SGX	59 hr
Jan 21, 5:02 AM PST	Winter Storm Warning	SGX	65 hr
Jan 21, 1:44 PM PST	Flash Flood Watch	SGX	55 hr
Jan 22, 12:12 PM PST	Areal Flood Advisory	SGX	6 hr
Jan 22, 2:36 PM PST	Flash Flood Warning	SGX	3 hr
Jan 22, 5:35 PM PST	Areal Flood Warning	SGX	3 hr
Jan 22, 5:41 PM PST	Areal Flood Advisory	SGX	48 hr
Jan 22, 5:48 PM PST	Areal Flood Advisory	PSR	4 hr
Jan 22, 8:35 PM PST	Areal Flood Warning	SGX	5 hr
Jan 23, 10:32 PM PST	Frost Advisory	SGX	9 hr
Jan 23, 10:32 PM PST	Frost Advisory	SGX	33 hr
Jan 25, 12:31 PM PST	Frost Advisory	SGX	19 hr
Jan 25, 1:41 PM PST	High Wind Watch	SGX	23 hr
Jan 26, 12:43 PM PST	High Wind Warning	SGX	29 hr
Jan 26, 12:43 PM PST	Wind Advisory	SGX	4 days
Feb 5, 2:06 PM PST	Wind Advisory	SGX	53 hr
Feb 11, 3:16 AM PST	Wind Advisory	SGX	54 hr
Feb 15, 1:54 PM PST	Winter Storm Watch	SGX	19 hr
Feb 15, 2:07 PM PST	Flash Flood Watch	SGX	71 hr
Feb 15, 2:07 PM PST	High Wind Watch	SGX	19 hr
Feb 16, 9:03 AM PST	High Wind Warning	SGX	36 hr
Feb 16, 9:16 AM PST	Winter Storm Warning	SGX	46 hr
Feb 17, 3:44 PM PST	Areal Flood Advisory	SGX	5 hr
Feb 17, 5:12 PM PST	Flash Flood Warning	SGX	4 hr
Feb 17, 10:15 PM PST	Areal Flood Warning	SGX	9 hr
Feb 17, 10:50 PM PST	Areal Flood Advisory	SGX	7 hr
Feb 21, 1:44 PM PST	Wind Advisory	SGX	44 hr
Feb 24, 12:39 PM PST	Frost Advisory	SGX	19 hr
Feb 25, 4:31 AM PST	Wind Advisory	SGX	65 hr
Feb 27, 2:24 AM PST	Winter Weather Advisory	SGX	20 hr
Feb 27, 3:27 PM PST	Areal Flood Warning	SGX	6 hr
Feb 27, 3:55 PM PST	Areal Flood Warning	SGX	8 hr
Feb 27, 10:15 PM PST	Areal Flood Advisory	SGX	4 hr
Mar 1, 3:05 AM PST	Wind Advisory	SGX	37 hr
Mar 3, 1:05 PM PST	High Wind Watch	SGX	15 hr
Mar 4, 4:29 AM PST	High Wind Warning	SGX	46 hr
Mar 4, 4:29 AM PST	Wind Advisory	SGX	46 hr
Mar 12, 12:06 PM PDT	Dense Fog Advisory	SGX	21 hr
Mar 26, 1:55 PM PDT	Wind Advisory	SGX	48 hr
Mar 27, 4:30 AM PDT	Fire Weather Watch	PSR	8 hr
Mar 27, 12:52 PM PDT	Red Flag Warning	PSR	30 hr
Mar 27, 9:23 PM PDT	Wind Advisory	SGX	17 hr
Mar 28, 8:12 PM PDT	High Wind Watch	SGX	22 hr
Mar 29, 6:13 PM PDT	High Wind Warning	SGX	29 hr
Mar 30, 2:56 AM PDT	Red Flag Warning	PSR	17 hr
Apr 3, 3:47 AM PDT	Wind Advisory	SGX	18 hr
Apr 7, 2:05 PM PDT	Wind Advisory	SGX	32 hr
Apr 12, 1:46 PM PDT	Wind Advisory	SGX	36 hr
Apr 24, 3:46 AM PDT	Wind Advisory	SGX	23 hr
Apr 25, 9:35 PM PDT	Wind Advisory	SGX	29 hr
Apr 26, 2:12 PM PDT	Fire Weather Watch	PSR	13 hr
Apr 27, 3:40 AM PDT	Red Flag Warning	PSR	41 hr
Apr 27, 1:41 PM PDT	High Wind Watch	SGX	15 hr
Apr 27, 1:42 PM PDT	Wind Advisory	PSR	30 hr
Apr 28, 4:38 AM PDT	High Wind Warning	SGX	31 hr
Apr 28, 4:38 AM PDT	Wind Advisory	SGX	31 hr
Apr 28, 2:25 PM PDT	Red Flag Warning	PSR	29 hr
May 5, 2:24 AM PDT	Wind Advisory	PSR	47 hr
May 5, 3:03 AM PDT	Wind Advisory	SGX	47 hr
May 6, 12:38 PM PDT	Winter Weather Advisory	SGX	34 hr
May 6, 4:15 PM PDT	Blowing Dust Advisory	PSR	4 hr
May 7, 6:15 PM PDT	Areal Flood Advisory	SGX	6 hr
May 15, 3:25 AM PDT	Wind Advisory	SGX	66 hr
May 18, 9:17 PM PDT	Wind Advisory	PSR	5 hr
May 24, 2:32 AM PDT	Wind Advisory	SGX	53 hr
Jun 10, 1:13 PM PDT	Wind Advisory	PSR	32 hr
Jun 11, 1:03 PM PDT	Wind Advisory	SGX	19 hr
Jun 12, 2:45 AM PDT	Excessive Heat Watch	PSR	75 days
Jun 14, 2:31 AM PDT	Excessive Heat Watch	SGX	24 hr
Jun 14, 2:50 AM PDT	Excessive Heat Warning	PSR	13 days
Jun 15, 2:31 AM PDT	Excessive Heat Warning	SGX	12 days
Jun 15, 2:31 AM PDT	Heat Advisory	SGX	7 days
Jun 22, 3:03 PM PDT	Heat Advisory	SGX	4 days
Jun 26, 9:34 AM PDT	Red Flag Warning	SGX	39 hr
Jul 4, 2:07 AM PDT	Excessive Heat Watch	PSR	12 hr
Jul 4, 2:13 PM PDT	Excessive Heat Warning	PSR	3 days
Jul 5, 1:43 PM PDT	Excessive Heat Watch	SGX	13 hr
Jul 6, 2:36 AM PDT	Excessive Heat Warning	SGX	66 hr
Jul 6, 2:36 AM PDT	Heat Advisory	SGX	66 hr
Jul 8, 7:10 PM PDT	Blowing Dust Advisory	PSR	3 hr
Jul 19, 4:45 AM PDT	Special Weather Statement	PSR	45 min
Jul 19, 5:05 AM PDT	Areal Flood Advisory	PSR	3 hr
Jul 24, 7:45 PM PDT	Flash Flood Warning	PSR	3 hr
Jul 29, 2:53 PM PDT	Special Weather Statement	PSR	52 min
Aug 1, 12:56 PM PDT	Flash Flood Watch	SGX	54 hr
Aug 1, 2:52 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 1, 3:01 PM PDT	Severe Thunderstorm Warning	SGX	59 min
Aug 1, 3:23 PM PDT	Severe Thunderstorm Warning	SGX	52 min
Aug 1, 3:42 PM PDT	Flash Flood Warning	SGX	3 hr
Aug 1, 3:57 PM PDT	Severe Thunderstorm Warning	SGX	45 min
Aug 1, 4:00 PM PDT	Severe Thunderstorm Warning	SGX	45 min
Aug 1, 4:17 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 2, 1:07 PM PDT	Flash Flood Warning	SGX	3 hr
Aug 2, 4:00 PM PDT	Special Weather Statement	PSR	45 min
Aug 2, 5:42 PM PDT	Blowing Dust Advisory	PSR	78 min
Aug 3, 2:52 AM PDT	Flash Flood Warning	SGX	3 hr
Aug 3, 3:10 AM PDT	Areal Flood Advisory	SGX	2 hr
Aug 3, 4:57 AM PDT	Areal Flood Advisory	PSR	3 hr
Aug 3, 5:19 AM PDT	Flash Flood Warning	PSR	3 hr
Aug 3, 8:13 AM PDT	Flash Flood Warning	PSR	3 hr
Aug 3, 11:46 AM PDT	Special Weather Statement	SGX	29 min
Aug 3, 11:50 AM PDT	Special Weather Statement	PSR	40 min
Aug 3, 12:16 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 3, 12:35 PM PDT	Flash Flood Warning	PSR	3 hr
Aug 3, 12:44 PM PDT	Areal Flood Advisory	SGX	2 hr
Aug 3, 1:30 PM PDT	Severe Thunderstorm Warning	PSR	45 min
Aug 3, 1:44 PM PDT	Flash Flood Warning	PSR	3 hr
Aug 3, 2:13 PM PDT	Special Weather Statement	PSR	47 min
Aug 3, 4:35 PM PDT	Severe Thunderstorm Warning	SGX	40 min
Aug 3, 4:51 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 3, 5:18 PM PDT	Areal Flood Advisory	SGX	117 min
Aug 10, 4:59 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 10, 7:01 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 10, 8:01 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 11, 1:28 PM PDT	Special Weather Statement	PSR	47 min
Aug 11, 3:32 PM PDT	Special Weather Statement	PSR	28 min
Aug 11, 3:56 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 25, 3:40 AM PDT	Excessive Heat Watch	SGX	24 hr
Aug 26, 2:50 AM PDT	Excessive Heat Warning	PSR	5 days
Aug 26, 3:59 AM PDT	Excessive Heat Warning	SGX	8 days
Aug 26, 3:59 AM PDT	Heat Advisory	SGX	8 days
Aug 30, 1:27 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 30, 3:44 PM PDT	Areal Flood Advisory	PSR	2 hr
Aug 30, 4:16 PM PDT	Areal Flood Advisory	PSR	3 hr
Aug 31, 2:11 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 31, 2:25 PM PDT	Severe Thunderstorm Warning	SGX	65 min
Aug 31, 3:04 PM PDT	Severe Thunderstorm Warning	SGX	56 min
Aug 31, 3:35 PM PDT	Severe Thunderstorm Warning	SGX	55 min
Aug 31, 3:36 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 31, 3:58 PM PDT	Flash Flood Warning	SGX	3 hr
Sep 2, 5:29 PM PDT	Severe Thunderstorm Warning	SGX	38 min
Sep 2, 9:10 PM PDT	Wind Advisory	SGX	16 hr
Sep 6, 3:54 PM PDT	Special Weather Statement	PSR	51 min
Sep 6, 4:07 PM PDT	Severe Thunderstorm Warning	PSR	53 min
Sep 6, 4:28 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 6, 6:02 PM PDT	Severe Thunderstorm Warning	PSR	38 min
Sep 6, 7:03 PM PDT	Areal Flood Advisory	PSR	3 hr
Sep 7, 1:33 PM PDT	Special Weather Statement	PSR	42 min
Sep 7, 2:10 PM PDT	Flash Flood Watch	PSR	54 hr
Sep 7, 4:42 PM PDT	Severe Thunderstorm Warning	PSR	63 min
Sep 7, 5:39 PM PDT	Severe Thunderstorm Warning	PSR	51 min
Sep 7, 6:09 PM PDT	Areal Flood Advisory	PSR	2 hr
Sep 7, 6:44 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 7, 6:51 PM PDT	Special Weather Statement	PSR	39 min
Sep 7, 9:12 PM PDT	Blowing Dust Advisory	PSR	108 min
Sep 8, 1:09 PM PDT	Blowing Dust Advisory	PSR	7 hr
Sep 8, 2:00 PM PDT	Special Weather Statement	PSR	45 min
Sep 8, 2:23 PM PDT	Severe Thunderstorm Warning	PSR	37 min
Sep 8, 2:36 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 8, 2:53 PM PDT	Severe Thunderstorm Warning	PSR	37 min
Sep 8, 2:57 PM PDT	Special Weather Statement	PSR	48 min
Sep 8, 3:16 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 8, 3:40 PM PDT	Dust Storm Warning	PSR	80 min
Sep 8, 4:00 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 8, 4:19 PM PDT	Special Weather Statement	PSR	26 min
Sep 8, 5:12 PM PDT	Severe Thunderstorm Warning	PSR	48 min
Sep 8, 5:33 PM PDT	Flash Flood Warning	SGX	3 hr
Sep 8, 5:43 PM PDT	Severe Thunderstorm Warning	PSR	47 min
Sep 8, 5:49 PM PDT	Severe Thunderstorm Warning	SGX	56 min
Sep 9, 9:43 AM PDT	Areal Flood Advisory	PSR	3 hr
Sep 9, 11:14 AM PDT	Flash Flood Warning	PSR	3 hr
Sep 9, 12:19 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 9, 12:53 PM PDT	Flash Flood Warning	PSR	3 hr
Sep 9, 3:49 PM PDT	Flash Flood Warning	SGX	3 hr
Sep 9, 5:35 PM PDT	Areal Flood Advisory	PSR	3 hr
Sep 9, 5:51 PM PDT	Special Weather Statement	PSR	39 min
Sep 20, 1:41 PM PDT	Wind Advisory	SGX	35 hr
Sep 20, 2:31 PM PDT	Wind Advisory	PSR	38 hr
Oct 6, 9:51 AM PDT	Fire Weather Watch	SGX	51 hr
Oct 7, 1:15 PM PDT	Red Flag Warning	SGX	69 hr
Oct 7, 1:34 PM PDT	Wind Advisory	PSR	48 hr
Oct 8, 3:35 AM PDT	Wind Advisory	SGX	38 hr
Oct 12, 12:06 PM PDT	Fire Weather Watch	SGX	25 hr
Oct 13, 1:01 PM PDT	Red Flag Warning	SGX	47 hr
Oct 19, 1:20 PM PDT	Fire Weather Watch	SGX	48 hr
Oct 19, 1:37 PM PDT	Excessive Heat Watch	SGX	48 hr
Oct 19, 2:05 PM PDT	Wind Advisory	PSR	33 hr
Oct 20, 2:50 AM PDT	Wind Advisory	SGX	18 hr
Oct 20, 11:15 AM PDT	Blowing Dust Advisory	PSR	7 hr
Oct 20, 1:14 PM PDT	Red Flag Warning	SGX	5 days
Oct 21, 1:07 PM PDT	Excessive Heat Warning	SGX	4 days
Oct 22, 12:37 PM PDT	Wind Advisory	SGX	68 hr
Nov 26, 12:46 PM PST	Wind Advisory	SGX	30 hr
Dec 1, 2:34 PM PST	Fire Weather Watch	SGX	23 hr
Dec 2, 2:00 PM PST	Red Flag Warning	SGX	8 days
Dec 2, 7:14 PM PST	High Wind Watch	SGX	19 hr
Dec 3, 2:28 PM PST	High Wind Warning	SGX	7 days
Dec 7, 2:26 AM PST	Wind Advisory	PSR	10 hr
Dec 7, 2:28 AM PST	Red Flag Warning	PSR	13 hr
Dec 12, 12:51 PM PST	Fire Weather Watch	SGX	20 hr
Dec 13, 8:44 AM PST	Red Flag Warning	SGX	49 hr
Dec 14, 1:29 AM PST	Wind Advisory	PSR	15 hr
Dec 14, 1:41 AM PST	Red Flag Warning	PSR	14 hr
Dec 14, 1:43 PM PST	Fire Weather Watch	SGX	46 hr
Dec 15, 12:41 PM PST	Red Flag Warning	SGX	55 hr
Dec 16, 12:59 PM PST	Wind Advisory	PSR	16 hr
Dec 16, 1:32 PM PST	Wind Advisory	SGX	30 hr
Dec 19, 2:41 AM PST	Wind Advisory	PSR	60 hr
Dec 19, 9:28 AM PST	Fire Weather Watch	SGX	26 hr
Dec 19, 5:13 PM PST	Wind Advisory	SGX	31 hr
Dec 20, 11:57 AM PST	Red Flag Warning	SGX	30 hr
Dec 20, 3:43 PM PST	Blowing Dust Advisory	SGX	8 hr
Dec 21, 1:40 PM PST	Frost Advisory	SGX	19 hr
Dec 22, 12:20 PM PST	Frost Advisory	SGX	21 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	19
Special Weather Statement	15
Flooding
Areal Flood Warning	5
Flash Flood Warning	21
Flash Flood Watch	5
Areal Flood Advisory	40
Winter
Winter Storm Warning	4
Winter Storm Watch	2
Winter Weather Advisory	3
Heat
Excessive Heat Warning	7
Excessive Heat Watch	6
Heat Advisory	4
Cold
Frost Advisory	6
Wind and dust
Dust Storm Warning	1
High Wind Warning	8
High Wind Watch	7
Blowing Dust Advisory	7
Wind Advisory	45
Fire
Red Flag Warning	14
Fire Weather Watch	9
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 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.