Weather alerts in California, September 2020

187 weather alerts in September 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.

Weather alerts by county

Each county as a circle sized by its count in September 2020. Tap one for its archive.

Alerts: 187
Warnings: 54
Watches: 43
Advisories: 88
Busiest day: September 6, 202019 alerts

Over time

By day

Days in UTC, the clock the archive keeps.

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	Counties	Lasted
Aug 31, 10:25 PM PDT	Small Craft Advisory	EKA		23 hr
Sep 1, 2:01 AM PDT	Excessive Heat Watch	VEF	Inyo, San Bernardino	34 hr
Sep 1, 2:23 AM PDT	Excessive Heat Watch	PSR	Imperial, Riverside, San Bernardino	35 hr
Sep 1, 2:38 AM PDT	Hazardous Seas Watch	EKA		56 min
Sep 1, 2:44 AM PDT	Excessive Heat Watch	SGX	Orange, Riverside, San Bernardino, San Diego	33 hr
Sep 1, 3:34 AM PDT	Hazardous Seas Warning	EKA		17 hr
Sep 1, 4:21 AM PDT	Excessive Heat Watch	HNX		55 hr
Sep 1, 4:27 AM PDT	Excessive Heat Watch	LOX	Los Angeles, Santa Barbara	32 hr
Sep 1, 1:01 PM PDT	Excessive Heat Watch	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more	48 hr
Sep 1, 1:06 PM PDT	Excessive Heat Watch	STO		45 hr
Sep 1, 2:17 PM PDT	Excessive Heat Watch	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	48 hr
Sep 2, 2:03 AM PDT	Small Craft Advisory	MTR		4 days
Sep 2, 11:53 AM PDT	Excessive Heat Warning	VEF	Inyo, San Bernardino	5 days
Sep 2, 11:54 AM PDT	Fire Weather Watch	MFR	Modoc	25 hr
Sep 2, 12:12 PM PDT	Excessive Heat Warning	SGX	Orange, Riverside, San Bernardino, San Diego	5 days
Sep 2, 12:24 PM PDT	Excessive Heat Warning	LOX	Los Angeles, Santa Barbara	5 days
Sep 2, 1:33 PM PDT	Excessive Heat Warning	PSR	Imperial, Riverside, San Bernardino	5 days
Sep 2, 6:25 PM PDT	Small Craft Advisory	LOX		6 days
Sep 3, 1:35 AM PDT	Excessive Heat Warning	HNX		5 days
Sep 3, 10:02 AM PDT	Excessive Heat Warning	STO		4 days
Sep 3, 11:29 AM PDT	Heat Advisory	REV	Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more	3 days
Sep 3, 12:39 PM PDT	Fire Weather Watch	MFR	Modoc	25 hr
Sep 3, 12:39 PM PDT	Red Flag Warning	MFR	Modoc	31 hr
Sep 3, 1:13 PM PDT	Excessive Heat Warning	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more	4 days
Sep 3, 1:13 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, City and County of San Francisco, San Mateo and 3 more	4 days
Sep 3, 1:16 PM PDT	Fire Weather Watch	SGX	Riverside, San Bernardino, San Diego	21 hr
Sep 3, 2:01 PM PDT	Excessive Heat Warning	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	5 days
Sep 4, 2:33 AM PDT	Small Craft Advisory	LOX		18 hr
Sep 4, 2:44 AM PDT	Small Craft Advisory	EKA		4 days
Sep 4, 9:31 AM PDT	Fire Weather Watch	MTR	San Mateo, Santa Clara, Santa Cruz	53 hr
Sep 4, 9:45 AM PDT	Fire Weather Watch	STO		52 hr
Sep 4, 10:15 AM PDT	Red Flag Warning	SGX	Riverside, San Bernardino, San Diego	56 hr
Sep 4, 11:01 AM PDT	Fire Weather Watch	EKA		51 hr
Sep 4, 1:58 PM PDT	Fire Weather Watch	MFR	Modoc, Siskiyou	30 hr
Sep 4, 1:58 PM PDT	Red Flag Warning	MFR	Modoc	30 hr
Sep 4, 2:40 PM PDT	Fire Weather Watch	LOX		19 hr
Sep 5, 10:05 AM PDT	Red Flag Warning	LOX		60 hr
Sep 5, 1:44 PM PDT	Fire Weather Watch	REV	El Dorado, Lassen, Madera, Modoc, Mono, Nevada and 3 more	42 hr
Sep 5, 1:54 PM PDT	Fire Weather Watch	VEF	Inyo, San Bernardino, Tulare	23 hr
Sep 5, 7:50 PM PDT	Excessive Heat Warning	MFR	Siskiyou	48 hr
Sep 5, 8:22 PM PDT	Fire Weather Watch	MFR	Siskiyou	23 hr
Sep 5, 8:22 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	4 days
Sep 6, 1:05 AM PDT	Dense Smoke Advisory	REV	Mono	27 hr
Sep 6, 1:35 AM PDT	High Wind Watch	VEF	San Bernardino	38 hr
Sep 6, 2:55 AM PDT	Small Craft Advisory	MTR		66 hr
Sep 6, 5:41 AM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	66 hr
Sep 6, 8:14 AM PDT	Red Flag Warning	REV	El Dorado, Lassen, Madera, Modoc, Mono, Nevada and 3 more	60 hr
Sep 6, 12:01 PM PDT	Lake Wind Advisory	REV	Alpine, El Dorado, Mono, Nevada, Placer	56 hr
Sep 6, 1:00 PM PDT	Red Flag Warning	HNX	Fresno, Kern, Madera, Mariposa, Tulare, Tuolumne	3 days
Sep 6, 1:16 PM PDT	Red Flag Warning	VEF	Inyo, San Bernardino, Tulare	3 days
Sep 6, 1:33 PM PDT	Wind Advisory	VEF	Inyo, San Bernardino	3 days
Sep 6, 2:09 PM PDT	Fire Weather Watch	SGX	Orange, Riverside, San Bernardino, San Diego	23 hr
Sep 6, 2:10 PM PDT	Red Flag Warning	STO		3 days
Sep 6, 2:16 PM PDT	Red Flag Warning	EKA		70 hr
Sep 6, 2:32 PM PDT	Red Flag Warning	MTR	San Mateo, Santa Clara, Santa Cruz	65 hr
Sep 6, 2:44 PM PDT	Red Flag Warning	PSR	Imperial, Riverside, San Bernardino	57 hr
Sep 6, 2:44 PM PDT	Wind Advisory	PSR	Imperial, Riverside, San Bernardino	55 hr
Sep 6, 4:28 PM PDT	Fire Weather Watch	LOX	Los Angeles	23 hr
Sep 7, 2:30 AM PDT	Wind Advisory	STO		40 hr
Sep 7, 2:45 AM PDT	Wind Advisory	MTR		44 hr
Sep 7, 2:53 AM PDT	Small Craft Advisory	LOX		18 hr
Sep 7, 4:33 AM PDT	Wind Advisory	MFR	Modoc	60 hr
Sep 7, 1:09 PM PDT	Red Flag Warning	SGX	Orange, Riverside, San Bernardino, San Diego	55 hr
Sep 7, 1:34 PM PDT	Freeze Watch	MFR	Modoc	14 hr
Sep 7, 2:19 PM PDT	Wind Advisory	LOX	Los Angeles	48 hr
Sep 7, 2:21 PM PDT	Blowing Dust Advisory	REV	Lassen, Mono, Plumas, Sierra	24 hr
Sep 7, 2:49 PM PDT	Small Craft Advisory	MTR		30 hr
Sep 7, 3:20 PM PDT	Red Flag Warning	LOX	Los Angeles	51 hr
Sep 7, 3:23 PM PDT	Blowing Dust Advisory	MFR	Modoc, Siskiyou	10 hr
Sep 7, 3:30 PM PDT	High Wind Warning	VEF	San Bernardino	32 hr
Sep 8, 3:23 AM PDT	Frost Advisory	MFR	Modoc	29 hr
Sep 8, 3:33 AM PDT	Heat Advisory	EKA	Del Norte, Humboldt, Mendocino	11 hr
Sep 8, 11:58 AM PDT	Blowing Dust Advisory	PSR	Imperial, Riverside	4 hr
Sep 8, 8:17 PM PDT	Small Craft Advisory	LOX		16 hr
Sep 8, 9:11 PM PDT	Small Craft Advisory	MTR		24 hr
Sep 9, 12:07 AM PDT	Wind Advisory	STO		9 hr
Sep 9, 10:15 AM PDT	Red Flag Warning	PSR	Imperial, Riverside	7 hr
Sep 9, 2:59 PM PDT	Red Flag Warning	MFR	Siskiyou	29 hr
Sep 9, 11:31 PM PDT	Dense Fog Advisory	LOX		9 hr
Sep 10, 2:06 AM PDT	Dense Smoke Advisory	REV	Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more	3 days
Sep 10, 10:19 PM PDT	Dense Fog Advisory	LOX		13 hr
Sep 10, 11:09 PM PDT	Dense Fog Advisory	MTR	Marin, Monterey, San Benito, City and County of San Francisco, San Mateo, Santa Cruz and 1 more	13 hr
Sep 11, 2:32 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	54 hr
Sep 11, 2:40 PM PDT	Dense Smoke Advisory	MFR	Siskiyou	41 hr
Sep 11, 7:21 PM PDT	Dense Fog Advisory	MTR	Marin, Monterey, San Benito, City and County of San Francisco, San Mateo, Santa Cruz and 1 more	14 hr
Sep 11, 8:58 PM PDT	Dense Fog Advisory	LOX		14 hr
Sep 12, 2:32 AM PDT	Small Craft Advisory	LOX		3 days
Sep 12, 11:00 AM PDT	Fire Weather Watch	REV	Lassen, Modoc, Plumas, Sierra	33 hr
Sep 12, 1:21 PM PDT	Fire Weather Watch	MFR	Modoc, Siskiyou	25 hr
Sep 12, 2:00 PM PDT	Dense Fog Advisory	LOX		20 hr
Sep 12, 2:17 PM PDT	Fire Weather Watch	STO		24 hr
Sep 12, 6:34 PM PDT	Dense Fog Advisory	MTR	Marin, Monterey, San Benito, City and County of San Francisco, San Mateo, Santa Cruz and 1 more	14 hr
Sep 13, 11:34 AM PDT	Dense Smoke Advisory	REV	Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more	23 hr
Sep 13, 1:52 PM PDT	Fire Weather Watch	MFR	Modoc, Siskiyou	23 hr
Sep 13, 1:52 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	31 hr
Sep 13, 2:24 PM PDT	Small Craft Advisory	MTR		24 hr
Sep 13, 2:27 PM PDT	Red Flag Warning	STO		30 hr
Sep 13, 6:55 PM PDT	Dense Smoke Advisory	MFR	Siskiyou	41 hr
Sep 13, 7:51 PM PDT	Red Flag Warning	REV	Lassen, Modoc, Plumas, Sierra	24 hr
Sep 14, 3:22 AM PDT	Dense Fog Advisory	LOX		6 hr
Sep 14, 1:04 PM PDT	Fire Weather Watch	MFR	Modoc, Siskiyou	26 hr
Sep 14, 1:04 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	31 hr
Sep 14, 2:18 PM PDT	Dense Smoke Advisory	REV	Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more	4 days
Sep 15, 2:09 AM PDT	Small Craft Advisory	MTR		7 days
Sep 15, 2:09 AM PDT	Small Craft Advisory	MTR		43 hr
Sep 15, 8:58 AM PDT	Small Craft Advisory	LOX		12 hr
Sep 15, 11:34 AM PDT	Fire Weather Watch	REV	El Dorado, Lassen, Madera, Modoc, Mono, Nevada and 3 more	28 hr
Sep 15, 1:57 PM PDT	Excessive Heat Warning	PSR	Imperial	54 hr
Sep 15, 1:59 PM PDT	Fire Weather Watch	VEF	Inyo, Tulare	47 hr
Sep 15, 2:39 PM PDT	Fire Weather Watch	MFR	Modoc	23 hr
Sep 15, 2:39 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	29 hr
Sep 16, 9:11 AM PDT	Small Craft Advisory	LOX		18 hr
Sep 16, 1:34 PM PDT	Red Flag Warning	MFR	Modoc	30 hr
Sep 16, 2:29 PM PDT	Lake Wind Advisory	REV	Alpine, El Dorado, Nevada, Placer	30 hr
Sep 16, 3:12 PM PDT	Red Flag Warning	REV	El Dorado, Lassen, Madera, Modoc, Mono, Nevada and 3 more	53 hr
Sep 16, 3:12 PM PDT	Red Flag Warning	REV	Lassen, Modoc	53 hr
Sep 17, 9:14 AM PDT	Small Craft Advisory	LOX		72 hr
Sep 17, 9:56 PM PDT	Lake Wind Advisory	REV	Alpine, El Dorado, Nevada, Placer	22 hr
Sep 18, 2:46 AM PDT	Small Craft Advisory	MTR		18 hr
Sep 18, 8:12 AM PDT	Small Craft Advisory	EKA		3 days
Sep 18, 9:29 AM PDT	Wind Advisory	LOX		24 hr
Sep 18, 2:31 PM PDT	Small Craft Advisory	MTR		34 hr
Sep 19, 2:10 AM PDT	Small Craft Advisory	MTR		3 days
Sep 19, 1:46 PM PDT	Wind Advisory	LOX		13 hr
Sep 21, 2:06 AM PDT	Small Craft Advisory	MTR		6 days
Sep 21, 2:59 AM PDT	Dense Fog Advisory	LOX		6 hr
Sep 21, 9:07 AM PDT	Small Craft Advisory	LOX		18 hr
Sep 21, 2:35 PM PDT	Small Craft Advisory	EKA		18 hr
Sep 21, 4:35 PM PDT	Dust Storm Advisory	PSR	Imperial	55 min
Sep 21, 8:15 PM PDT	Small Craft Advisory	EKA		5 days
Sep 22, 2:35 AM PDT	Small Craft Advisory	LOX		5 days
Sep 22, 10:02 AM PDT	Fire Weather Watch	MTR	Alameda, Contra Costa	65 hr
Sep 22, 1:02 PM PDT	Fire Weather Watch	STO		69 hr
Sep 22, 1:54 PM PDT	Beach Hazards Statement	EKA	Del Norte, Humboldt, Mendocino	70 hr
Sep 22, 2:32 PM PDT	Small Craft Advisory	MTR		30 hr
Sep 23, 2:44 AM PDT	Gale Watch	LOX		24 hr
Sep 23, 2:47 AM PDT	Small Craft Advisory	MTR		5 days
Sep 23, 4:25 AM PDT	Dense Fog Advisory	LOX		5 hr
Sep 23, 2:38 PM PDT	Fire Weather Watch	EKA		44 hr
Sep 24, 1:33 AM PDT	High Surf Advisory	LOX		55 hr
Sep 24, 2:15 AM PDT	Gale Warning	LOX		49 hr
Sep 24, 2:44 AM PDT	Wind Advisory	LOX		23 hr
Sep 24, 7:40 AM PDT	Beach Hazards Statement	MTR	Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma	36 hr
Sep 24, 2:09 PM PDT	Small Craft Advisory	MTR		55 hr
Sep 24, 8:44 PM PDT	Gale Warning	LOX		30 hr
Sep 25, 2:58 AM PDT	Gale Watch	EKA		31 hr
Sep 25, 3:27 AM PDT	Red Flag Warning	MTR	Alameda, Contra Costa, Marin, Napa, Sonoma	4 days
Sep 25, 4:52 AM PDT	High Surf Advisory	MTR	Monterey	15 hr
Sep 25, 10:08 AM PDT	Red Flag Warning	STO		3 days
Sep 25, 10:12 AM PDT	Red Flag Warning	EKA		3 days
Sep 25, 1:52 PM PDT	Fire Weather Watch	SGX	Riverside, San Bernardino, San Diego	47 hr
Sep 25, 2:07 PM PDT	Fire Weather Watch	MFR	Modoc, Siskiyou	25 hr
Sep 25, 3:22 PM PDT	Wind Advisory	STO		71 hr
Sep 26, 8:50 AM PDT	Small Craft Advisory	EKA		36 hr
Sep 26, 10:03 AM PDT	Gale Warning	EKA		41 hr
Sep 26, 11:35 AM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 3 more	55 hr
Sep 26, 11:56 AM PDT	Fire Weather Watch	VEF	San Bernardino	24 hr
Sep 26, 1:33 PM PDT	Fire Weather Watch	LOX	Los Angeles	26 hr
Sep 26, 2:38 PM PDT	Red Flag Warning	MFR	Modoc, Siskiyou	67 hr
Sep 27, 3:44 AM PDT	Wind Advisory	LOX	Los Angeles	35 hr
Sep 27, 1:03 PM PDT	Red Flag Warning	SGX	Riverside, San Bernardino, San Diego	52 hr
Sep 27, 1:10 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	4 days
Sep 27, 2:16 PM PDT	Heat Advisory	LOX	Los Angeles, Santa Barbara	5 days
Sep 27, 3:05 PM PDT	Red Flag Warning	LOX	Los Angeles	26 hr
Sep 27, 7:20 PM PDT	Hazardous Seas Warning	EKA		8 hr
Sep 27, 9:06 PM PDT	Excessive Heat Watch	EKA	Del Norte, Humboldt, Mendocino	6 hr
Sep 27, 10:48 PM PDT	Small Craft Advisory	EKA		10 hr
Sep 28, 3:01 AM PDT	Hazardous Seas Warning	EKA		9 hr
Sep 28, 3:19 AM PDT	Wind Advisory	LOX	Los Angeles	12 hr
Sep 28, 3:30 AM PDT	Heat Advisory	EKA	Del Norte, Humboldt, Mendocino	15 hr
Sep 28, 4:56 AM PDT	Small Craft Advisory	MTR		14 hr
Sep 29, 4:30 AM PDT	Dense Fog Advisory	LOX		5 hr
Sep 29, 1:42 PM PDT	Heat Advisory	MTR	Monterey, San Benito	30 hr
Sep 29, 1:42 PM PDT	Heat Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more	3 days
Sep 29, 8:15 PM PDT	Small Craft Advisory	LOX		5 days
Sep 29, 8:31 PM PDT	Fire Weather Watch	MTR	Monterey	13 hr
Sep 30, 1:13 AM PDT	Dense Fog Advisory	LOX		7 hr
Sep 30, 2:00 AM PDT	Small Craft Advisory	LOX		25 hr
Sep 30, 3:30 AM PDT	Small Craft Advisory	MTR		24 hr
Sep 30, 9:07 AM PDT	Red Flag Warning	MTR	Monterey, San Mateo, Santa Clara, Santa Cruz	69 hr
Sep 30, 1:22 PM PDT	Excessive Heat Warning	LOX	Los Angeles	31 hr
Sep 30, 1:22 PM PDT	Heat Advisory	LOX	Los Angeles	55 hr
Sep 30, 1:30 PM PDT	Excessive Heat Warning	SGX	Orange, Riverside, San Bernardino, San Diego	55 hr
Sep 30, 1:30 PM PDT	Heat Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	55 hr
Sep 30, 2:41 PM PDT	Red Flag Warning	LOX		18 hr
Sep 30, 3:00 PM PDT	Small Craft Advisory	EKA		6 days
Sep 30, 4:28 PM PDT	Red Flag Warning	EKA		52 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Heat
Excessive Heat Warning	12
Excessive Heat Watch	9
Heat Advisory	11
Cold
Freeze Watch	1
Frost Advisory	1
Wind and dust
High Wind Warning	1
High Wind Watch	1
Blowing Dust Advisory	3
Dust Storm Advisory	1
Lake Wind Advisory	3
Wind Advisory	13
Fire
Red Flag Warning	35
Fire Weather Watch	29
Fog and smoke
Dense Fog Advisory	12
Dense Smoke Advisory	6
Coast and beach
High Surf Advisory	2
Beach Hazards Statement	2
Marine
Gale Warning	3
Hazardous Seas Warning	3
Gale Watch	2
Hazardous Seas Watch	1
Small Craft Advisory	36

Nearby

Alerts in force now Tornadoes on record The radar archive 2019 2021

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. Rebuilt daily.