Alert archive / California / San Diego County

Weather alerts in San Diego County, California, 2021

219 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

San Diego County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 219
Warnings: 44
Watches: 31
Advisories: 114
Busiest month: December35 alerts
Busiest day: September 24, 202111 alerts

Over time

By month

Warning verification

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

San Diego County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	7	4	43%	10	50%	18 min
Flash flood warnings	11	1	91%	11	27%	86 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS San Diego, CA: severe thunderstorm warnings	15	4	73%	19	32%	17 min
NWS San Diego, CA: flash flood warnings	24	7	71%	76	28%	67 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 8, 12:38 PM PST	Wind Advisory	SGX	44 hr
Jan 10, 1:36 AM PST	Coastal Flood Advisory	SGX	59 hr
Jan 13, 12:51 PM PST	Red Flag Warning	SGX	3 days
Jan 13, 1:35 PM PST	Beach Hazards Statement	SGX	6 days
Jan 15, 3:13 AM PST	Wind Advisory	SGX	10 hr
Jan 16, 1:39 AM PST	High Surf Advisory	SGX	4 days
Jan 16, 6:33 PM PST	High Wind Watch	SGX	42 hr
Jan 17, 1:20 PM PST	Fire Weather Watch	SGX	21 hr
Jan 18, 9:50 AM PST	Red Flag Warning	SGX	36 hr
Jan 18, 12:42 PM PST	High Wind Warning	SGX	57 hr
Jan 19, 10:07 AM PST	Flash Flood Watch	SGX	38 hr
Jan 21, 5:45 PM PST	Winter Weather Advisory	SGX	60 hr
Jan 22, 8:02 AM PST	Wind Advisory	SGX	14 hr
Jan 22, 12:12 PM PST	Winter Storm Watch	SGX	46 hr
Jan 24, 1:45 AM PST	High Surf Advisory	SGX	64 hr
Jan 24, 10:12 AM PST	Winter Storm Warning	SGX	44 hr
Jan 24, 10:12 AM PST	Winter Weather Advisory	SGX	44 hr
Jan 24, 12:38 PM PST	High Wind Warning	SGX	38 hr
Jan 24, 12:38 PM PST	Wind Advisory	SGX	33 hr
Jan 25, 11:32 PM PST	Frost Advisory	SGX	9 hr
Jan 27, 10:58 AM PST	Flash Flood Watch	SGX	53 hr
Jan 28, 3:07 AM PST	Winter Weather Advisory	SGX	39 hr
Jan 29, 12:34 AM PST	Areal Flood Advisory	SGX	3 hr
Jan 29, 11:42 AM PST	Beach Hazards Statement	SGX	5 hr
Jan 29, 12:21 PM PST	Special Weather Statement	SGX	39 min
Jan 29, 2:12 PM PST	Special Weather Statement	SGX	33 min
Jan 29, 3:35 PM PST	Areal Flood Advisory	SGX	2 hr
Feb 6, 9:34 PM PST	Dense Fog Advisory	SGX	11 hr
Feb 7, 8:44 PM PST	Dense Fog Advisory	SGX	13 hr
Feb 12, 2:17 AM PST	High Wind Watch	SGX	11 hr
Feb 12, 1:19 PM PST	High Wind Warning	SGX	33 hr
Feb 13, 3:03 AM PST	Wind Advisory	SGX	15 hr
Feb 14, 11:28 AM PST	Wind Advisory	SGX	25 hr
Feb 15, 12:39 PM PST	High Wind Warning	SGX	21 hr
Feb 17, 11:57 AM PST	Wind Advisory	SGX	26 hr
Feb 19, 1:21 PM PST	Wind Advisory	SGX	50 hr
Feb 20, 5:20 PM PST	Wind Advisory	SGX	22 hr
Feb 23, 12:06 PM PST	High Wind Watch	SGX	14 hr
Feb 24, 2:25 AM PST	High Wind Warning	SGX	34 hr
Feb 26, 3:44 AM PST	High Wind Watch	SGX	23 hr
Feb 27, 2:52 AM PST	High Wind Warning	SGX	36 hr
Feb 28, 2:28 AM PST	Wind Advisory	SGX	25 hr
Mar 2, 12:25 PM PST	Winter Weather Advisory	SGX	34 hr
Mar 3, 3:00 AM PST	Wind Advisory	SGX	19 hr
Mar 3, 9:51 AM PST	Beach Hazards Statement	SGX	8 hr
Mar 3, 12:05 PM PST	Areal Flood Advisory	SGX	3 hr
Mar 7, 12:40 PM PST	Winter Storm Watch	SGX	29 hr
Mar 8, 7:47 AM PST	Wind Advisory	SGX	62 hr
Mar 8, 5:45 PM PST	Winter Storm Warning	SGX	4 days
Mar 10, 11:21 AM PST	Beach Hazards Statement	SGX	15 hr
Mar 10, 12:40 PM PST	Special Weather Statement	SGX	50 min
Mar 10, 2:02 PM PST	Flash Flood Watch	SGX	38 hr
Mar 10, 2:22 PM PST	Winter Weather Advisory	SGX	20 hr
Mar 11, 2:06 PM PST	Winter Weather Advisory	SGX	13 hr
Mar 13, 1:55 PM PST	High Wind Watch	SGX	12 hr
Mar 14, 1:41 AM PST	High Wind Warning	SGX	48 hr
Mar 14, 1:01 PM PDT	Winter Weather Advisory	SGX	38 hr
Mar 14, 1:04 PM PDT	Wind Advisory	SGX	19 hr
Mar 14, 1:04 PM PDT	Wind Advisory	SGX	36 hr
Mar 15, 1:43 AM PDT	High Surf Advisory	SGX	20 hr
Mar 15, 1:01 PM PDT	Frost Advisory	SGX	19 hr
Mar 16, 3:57 AM PDT	Wind Advisory	SGX	4 hr
Mar 22, 3:48 AM PDT	Wind Advisory	SGX	26 hr
Mar 23, 12:15 PM PDT	Wind Advisory	SGX	24 hr
Mar 24, 1:23 PM PDT	Wind Advisory	SGX	38 hr
Mar 29, 12:46 PM PDT	Wind Advisory	SGX	50 hr
Apr 1, 9:17 AM PDT	Beach Hazards Statement	SGX	8 hr
Apr 4, 1:43 AM PDT	High Wind Watch	SGX	12 hr
Apr 4, 4:00 AM PDT	Dense Fog Advisory	SGX	4 hr
Apr 4, 8:33 AM PDT	Dense Fog Advisory	SGX	2 hr
Apr 4, 1:28 PM PDT	Wind Advisory	SGX	40 hr
Apr 7, 2:48 AM PDT	Wind Advisory	SGX	45 hr
Apr 13, 4:08 AM PDT	Wind Advisory	SGX	46 hr
Apr 16, 12:12 PM PDT	Wind Advisory	SGX	49 hr
Apr 20, 3:44 AM PDT	Wind Advisory	SGX	49 hr
Apr 21, 5:21 PM PDT	Blowing Dust Advisory	SGX	3 hr
Apr 23, 1:57 PM PDT	Wind Advisory	SGX	61 hr
Apr 26, 2:35 AM PDT	Wind Advisory	SGX	21 hr
Apr 30, 1:29 PM PDT	Wind Advisory	SGX	58 hr
May 6, 1:12 PM PDT	Wind Advisory	SGX	42 hr
May 15, 1:57 AM PDT	Wind Advisory	SGX	54 hr
May 18, 1:29 PM PDT	Wind Advisory	SGX	3 days
Jun 1, 2:08 PM PDT	Excessive Heat Warning	SGX	3 days
Jun 6, 12:35 PM PDT	Wind Advisory	SGX	41 hr
Jun 9, 12:51 PM PDT	Excessive Heat Watch	SGX	5 days
Jun 10, 1:37 PM PDT	Excessive Heat Warning	SGX	10 days
Jun 21, 1:34 AM PDT	Beach Hazards Statement	SGX	4 days
Jun 24, 1:31 PM PDT	Excessive Heat Watch	SGX	24 hr
Jun 25, 1:05 PM PDT	Excessive Heat Warning	SGX	3 days
Jul 6, 1:26 PM PDT	Excessive Heat Watch	SGX	24 hr
Jul 6, 1:26 PM PDT	Excessive Heat Warning	SGX	6 days
Jul 7, 1:20 PM PDT	Heat Advisory	SGX	5 days
Jul 17, 4:12 PM PDT	Areal Flood Advisory	SGX	100 min
Jul 18, 8:07 AM PDT	Flash Flood Watch	SGX	11 hr
Jul 18, 1:31 PM PDT	Special Weather Statement	SGX	44 min
Jul 18, 2:05 PM PDT	Areal Flood Advisory	SGX	58 min
Jul 18, 5:49 PM PDT	Special Weather Statement	SGX	41 min
Jul 22, 3:45 PM PDT	Flash Flood Warning Considerable damage threat	SGX	2 hr
Jul 22, 4:18 PM PDT	Flash Flood Warning Considerable damage threat	SGX	117 min
Jul 22, 4:22 PM PDT	Severe Thunderstorm Warning	SGX	53 min
Jul 25, 3:08 PM PDT	Areal Flood Advisory	SGX	15 min
Jul 25, 3:23 PM PDT	Flash Flood Warning Considerable damage threat	SGX	112 min
Jul 25, 4:32 PM PDT	Areal Flood Advisory	SGX	77 min
Jul 25, 6:53 PM PDT	Flash Flood Watch	SGX	23 hr
Jul 26, 4:53 AM PDT	Areal Flood Advisory	SGX	3 hr
Jul 28, 3:18 PM PDT	Areal Flood Advisory	SGX	3 hr
Jul 28, 4:12 PM PDT	Special Weather Statement	SGX	48 min
Jul 30, 2:38 PM PDT	Flash Flood Warning	SGX	2 hr
Jul 31, 1:14 PM PDT	Areal Flood Advisory	SGX	5 hr
Jul 31, 1:30 PM PDT	Areal Flood Advisory	SGX	3 hr
Jul 31, 1:39 PM PDT	Special Weather Statement	SGX	51 min
Jul 31, 5:50 PM PDT	Areal Flood Advisory	SGX	2 hr
Aug 1, 12:50 PM PDT	Excessive Heat Watch	SGX	23 hr
Aug 1, 12:50 PM PDT	Heat Advisory	SGX	4 days
Aug 2, 11:38 AM PDT	Excessive Heat Warning	SGX	3 days
Aug 9, 1:34 PM PDT	Flash Flood Watch	SGX	54 hr
Aug 9, 5:26 PM PDT	Areal Flood Advisory	SGX	2 hr
Aug 9, 5:26 PM PDT	Special Weather Statement	SGX	64 min
Aug 10, 9:33 PM PDT	Dust Storm Warning	SGX	57 min
Aug 10, 10:26 PM PDT	Areal Flood Advisory	SGX	3 hr
Aug 10, 10:31 PM PDT	Dust Storm Advisory	SGX	59 min
Aug 10, 11:27 PM PDT	Flash Flood Warning Considerable damage threat	SGX	3 hr
Aug 23, 12:32 PM PDT	Excessive Heat Watch	SGX	25 hr
Aug 24, 1:30 PM PDT	Excessive Heat Warning	SGX	5 days
Aug 24, 1:30 PM PDT	Heat Advisory	SGX	5 days
Aug 29, 12:54 PM PDT	Special Weather Statement	SGX	51 min
Aug 29, 1:18 PM PDT	Flash Flood Warning Considerable damage threat	SGX	3 hr
Aug 29, 2:35 PM PDT	Special Weather Statement	SGX	40 min
Aug 29, 3:51 PM PDT	Areal Flood Advisory	SGX	114 min
Aug 30, 2:38 AM PDT	Flash Flood Watch	SGX	42 hr
Aug 30, 12:22 PM PDT	Areal Flood Advisory	SGX	113 min
Aug 30, 12:39 PM PDT	Special Weather Statement	SGX	51 min
Aug 30, 1:17 PM PDT	Areal Flood Advisory	SGX	118 min
Aug 31, 3:30 PM PDT	Special Weather Statement	SGX	45 min
Aug 31, 4:13 PM PDT	Severe Thunderstorm Warning	SGX	62 min
Aug 31, 5:17 PM PDT	Severe Thunderstorm Warning	SGX	58 min
Aug 31, 5:44 PM PDT	Flash Flood Warning Considerable damage threat	SGX	96 min
Sep 3, 1:30 AM PDT	Beach Hazards Statement	SGX	4 days
Sep 3, 1:18 PM PDT	Heat Advisory	SGX	9 days
Sep 7, 1:13 PM PDT	Heat Advisory	SGX	5 days
Sep 9, 2:12 PM PDT	Areal Flood Advisory	SGX	3 hr
Sep 10, 1:15 PM PDT	Areal Flood Advisory	SGX	3 hr
Sep 10, 2:24 PM PDT	Flash Flood Warning Considerable damage threat	SGX	2 hr
Sep 10, 3:06 PM PDT	Special Weather Statement	SGX	54 min
Sep 12, 2:01 AM PDT	Beach Hazards Statement	SGX	4 days
Sep 20, 12:33 PM PDT	Heat Advisory	SGX	55 hr
Sep 24, 8:56 AM PDT	Flash Flood Watch	SGX	10 hr
Sep 24, 11:08 AM PDT	Beach Hazards Statement	SGX	8 hr
Sep 24, 12:13 PM PDT	Severe Thunderstorm Warning	SGX	31 min
Sep 24, 12:21 PM PDT	Flash Flood Warning Considerable damage threat	SGX	56 min
Sep 24, 1:24 PM PDT	Severe Thunderstorm Warning	SGX	51 min
Sep 24, 1:28 PM PDT	Flash Flood Warning Considerable damage threat	SGX	2 hr
Sep 24, 2:09 PM PDT	Flash Flood Warning Considerable damage threat	SGX	3 hr
Sep 24, 2:41 PM PDT	Severe Thunderstorm Warning	SGX	64 min
Sep 24, 2:59 PM PDT	Special Weather Statement	SGX	61 min
Sep 24, 3:20 PM PDT	Severe Thunderstorm Warning	SGX	55 min
Sep 24, 3:30 PM PDT	Mesoscale Discussion	SPC	90 min
Oct 4, 12:20 PM PDT	Beach Hazards Statement	SGX	15 hr
Oct 4, 6:02 PM PDT	Special Weather Statement	SGX	43 min
Oct 4, 7:10 PM PDT	Special Weather Statement	SGX	50 min
Oct 9, 12:17 PM PDT	Wind Advisory	SGX	63 hr
Oct 10, 2:54 AM PDT	High Wind Warning	SGX	48 hr
Oct 10, 12:02 PM PDT	High Surf Advisory	SGX	44 hr
Oct 22, 12:55 PM PDT	Beach Hazards Statement	SGX	33 hr
Oct 24, 1:20 AM PDT	High Surf Advisory	SGX	3 days
Oct 24, 1:38 PM PDT	Wind Advisory	SGX	36 hr
Oct 28, 2:50 AM PDT	Wind Advisory	SGX	12 hr
Oct 29, 9:29 PM PDT	Dense Fog Advisory	SGX	12 hr
Nov 4, 1:31 PM PDT	Beach Hazards Statement	SGX	31 hr
Nov 5, 1:03 AM PDT	Dense Fog Advisory	SGX	14 min
Nov 5, 1:17 AM PDT	Dense Fog Advisory	SGX	8 hr
Nov 5, 1:35 PM PDT	Dense Fog Advisory	SGX	11 hr
Nov 7, 2:45 AM PST	Dense Fog Advisory	SGX	6 hr
Nov 15, 2:50 PM PST	Dense Fog Advisory	SGX	19 hr
Nov 19, 4:00 AM PST	Dense Fog Advisory	SGX	5 hr
Nov 19, 10:48 AM PST	Fire Weather Watch	SGX	3 hr
Nov 19, 1:35 PM PST	Red Flag Warning	SGX	53 hr
Nov 20, 3:00 AM PST	Dense Fog Advisory	SGX	6 hr
Nov 20, 3:00 AM PST	Wind Advisory	SGX	47 hr
Nov 22, 1:12 PM PST	Fire Weather Watch	SGX	20 hr
Nov 23, 9:29 AM PST	Red Flag Warning	SGX	3 days
Nov 24, 3:29 AM PST	High Wind Watch	SGX	9 hr
Nov 24, 3:29 AM PST	High Wind Warning	SGX	36 hr
Nov 30, 12:45 AM PST	Dense Fog Advisory	SGX	8 hr
Dec 1, 5:15 AM PST	Dense Fog Advisory	SGX	4 hr
Dec 1, 1:37 PM PST	Dense Fog Advisory	SGX	20 hr
Dec 3, 5:34 PM PST	Dense Fog Advisory	SGX	15 hr
Dec 4, 6:31 PM PST	Dense Fog Advisory	SGX	14 hr
Dec 9, 1:54 AM PST	Wind Advisory	SGX	14 hr
Dec 12, 3:00 AM PST	High Wind Watch	SGX	25 hr
Dec 13, 3:50 AM PST	High Wind Warning	SGX	44 hr
Dec 13, 3:50 AM PST	Wind Advisory	SGX	44 hr
Dec 13, 10:42 AM PST	Flood Watch	SGX	34 hr
Dec 13, 1:07 PM PST	High Surf Advisory	SGX	49 hr
Dec 14, 11:46 AM PST	Areal Flood Advisory	SGX	3 hr
Dec 14, 1:15 PM PST	Areal Flood Advisory	SGX	3 hr
Dec 14, 8:24 PM PST	Frost Advisory	SGX	13 hr
Dec 16, 11:37 AM PST	Wind Advisory	SGX	48 hr
Dec 17, 11:36 AM PST	Frost Advisory	SGX	20 hr
Dec 18, 1:47 AM PST	Frost Advisory	SGX	30 hr
Dec 19, 2:28 AM PST	Frost Advisory	SGX	30 hr
Dec 22, 10:15 AM PST	Flood Watch	SGX	50 hr
Dec 23, 2:57 AM PST	Wind Advisory	SGX	39 hr
Dec 23, 9:31 PM PST	Areal Flood Advisory	SGX	3 hr
Dec 24, 2:26 AM PST	Areal Flood Advisory	SGX	3 hr
Dec 24, 6:14 AM PST	Beach Hazards Statement	SGX	2 hr
Dec 24, 7:07 AM PST	Areal Flood Advisory	SGX	2 hr
Dec 24, 7:31 AM PST	Areal Flood Advisory	SGX	90 min
Dec 25, 1:40 PM PST	Winter Storm Watch	SGX	24 hr
Dec 25, 1:40 PM PST	Winter Weather Advisory	SGX	16 hr
Dec 26, 3:25 AM PST	Wind Advisory	SGX	9 hr
Dec 26, 12:03 PM PST	High Wind Warning	SGX	32 hr
Dec 26, 1:40 PM PST	Winter Storm Warning	SGX	37 hr
Dec 27, 7:39 PM PST	Wind Advisory	SGX	7 hr
Dec 28, 3:00 AM PST	Winter Storm Watch	SGX	10 hr
Dec 28, 11:07 AM PST	Flood Watch	SGX	48 hr
Dec 28, 1:26 PM PST	Winter Storm Warning	SGX	55 hr
Dec 29, 3:47 AM PST	Winter Weather Advisory	SGX	23 hr
Dec 31, 3:29 AM PST	Wind Advisory	SGX	24 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
Mesoscale Discussion	1
Special Weather Statement	16
Flooding
Flash Flood Warning	11
Flash Flood Watch	8
Flood Watch	3
Areal Flood Advisory	25
Winter
Winter Storm Warning	4
Winter Storm Watch	4
Winter Weather Advisory	9
Heat
Excessive Heat Warning	6
Excessive Heat Watch	5
Heat Advisory	6
Cold
Frost Advisory	6
Wind and dust
Dust Storm Warning	1
High Wind Warning	11
High Wind Watch	8
Blowing Dust Advisory	1
Dust Storm Advisory	1
Wind Advisory	42
Fire
Red Flag Warning	4
Fire Weather Watch	3
Fog and smoke
Dense Fog Advisory	17
Coast and beach
Coastal Flood Advisory	1
High Surf Advisory	6
Beach Hazards Statement	13

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.