Alert archive / California / Flood Watches
Flood Watches in California, 2023
78 flood watches in 2023. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flood watches reaches back to 2005.
Flood Watches by county
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Flood Watches
- 78
- Busiest month
- March22 flood watches
- Busiest day
- March 7, 20236 flood watches
Over time
By month
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 |
|---|---|---|---|---|
| Jan 2, 12:09 PM PST | Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 3 days |
| Jan 2, 12:26 PM PST | Flood Watch | STO | 3 days | |
| Jan 2, 12:51 PM PST | Flood Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 3 days |
| Jan 3, 2:37 AM PST | Flood Watch | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more | 68 hr |
| Jan 3, 11:41 AM PST | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 48 hr |
| Jan 3, 12:31 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 51 hr |
| Jan 6, 1:23 AM PST | Flood Watch | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more | 5 days |
| Jan 6, 1:50 AM PST | Flood Watch | STO | 5 days | |
| Jan 6, 3:11 AM PST | Flood Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 4 days |
| Jan 6, 3:16 AM PST | Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 5 days |
| Jan 8, 12:35 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 50 hr |
| Jan 8, 1:55 PM PST | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 46 hr |
| Jan 9, 9:34 AM PST | Flood Watch | VEF | Inyo | 13 hr |
| Jan 10, 9:23 PM PST | Flood Watch | STO | 27 hr | |
| Jan 11, 12:41 AM PST | Flood Watch | MTR | Marin, Napa, Sonoma | 22 hr |
| Jan 11, 2:10 AM PST | Flood Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 23 hr |
| Jan 12, 10:04 AM PST | Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 4 days |
| Jan 12, 11:25 AM PST | Flood Watch | STO | 63 hr | |
| Jan 12, 1:17 PM PST | Flood Watch | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 59 hr |
| Jan 13, 2:19 AM PST | Flood Watch | EKA | Humboldt, Lake, Mendocino, Trinity | 32 hr |
| Jan 13, 1:15 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 37 hr |
| Feb 22, 1:35 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 3 days |
| Feb 22, 2:14 PM PST | Flood Watch | LOX | Los Angeles, Santa Barbara, Ventura | 3 days |
| Feb 23, 12:43 AM PST | Flood Watch | HNX | Kern, Kings, Tulare | 50 hr |
| Mar 7, 12:21 PM PST | Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 4 days |
| Mar 7, 12:26 PM PST | Flood Watch | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 2 more | 8 days |
| Mar 7, 1:12 PM PST | Flood Watch | REV | Alpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more | 48 hr |
| Mar 7, 1:12 PM PST | Flood Watch | STO | 4 days | |
| Mar 7, 1:19 PM PST | Flood Watch | VEF | Inyo | 5 days |
| Mar 7, 1:23 PM PST | Flood Watch | EKA | Lake, Mendocino | 62 hr |
| Mar 8, 12:56 PM PST | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 63 hr |
| Mar 10, 8:21 AM PST | Flood Watch | SGX | Riverside, San Bernardino | 20 hr |
| Mar 11, 11:30 AM PST | Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 3 days |
| Mar 11, 3:32 PM PST | Flood Watch | STO | 3 days | |
| Mar 12, 3:30 AM PDT | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 3 days |
| Mar 12, 9:07 AM PDT | Flood Watch | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 63 hr |
| Mar 12, 1:20 PM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more | 24 hr |
| Mar 12, 5:22 PM PDT | Flood Watch | MFR | Siskiyou | 48 hr |
| Mar 13, 1:02 PM PDT | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 48 hr |
| Mar 19, 5:46 AM PDT | Flood Watch | HNX | Fresno, Kern, Tulare | 23 hr |
| Mar 20, 2:46 AM PDT | Flood Watch | VEF | San Bernardino | 58 hr |
| Mar 20, 12:27 PM PDT | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 53 hr |
| Mar 20, 1:13 PM PDT | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 48 hr |
| Mar 20, 2:02 PM PDT | Flood Watch | HNX | Fresno, Kern, Kings, Madera, Mariposa, Merced and 1 more | 57 hr |
| Mar 28, 9:56 AM PDT | Flood Watch | HNX | Fresno, Kern, Madera, Mariposa, Merced, Tulare | 43 hr |
| Mar 30, 5:07 AM PDT | Flood Watch | HNX | Fresno, Kern, Madera, Mariposa, Merced, Tulare | 6 hr |
| Apr 13, 1:36 PM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Nevada, Placer and 2 more | 14 min |
| Apr 13, 1:50 PM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Nevada, Placer and 2 more | 3 days |
| Apr 24, 1:00 PM PDT | Flood Watch | HNX | Madera, Mariposa, Tuolumne | 7 days |
| Apr 24, 2:36 PM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more | 6 days |
| May 17, 12:45 PM PDT | Flood Watch | REV | Alpine, El Dorado, Mono, Nevada, Placer | 6 days |
| May 25, 7:53 AM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more | 14 hr |
| May 28, 8:27 AM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more | 58 hr |
| Jun 11, 1:13 AM PDT | Flood Watch | REV | Alpine, El Dorado, Lassen, Mono, Nevada, Placer and 2 more | 44 hr |
| Jun 26, 2:40 PM PDT | Flood Watch | REV | Mono | 4 days |
| Jun 27, 1:17 AM PDT | Flood Watch | VEF | Inyo | 7 days |
| Jul 12, 1:33 PM PDT | Flood Watch | REV | Mono | 47 hr |
| Aug 17, 12:41 PM PDT | Flood Watch | VEF | Inyo, San Bernardino | 5 days |
| Aug 17, 12:51 PM PDT | Flood Watch | HNX | Fresno, Kern, Tulare | 4 days |
| Aug 17, 12:59 PM PDT | Flood Watch | LOX | Los Angeles, Santa Barbara, Ventura | 4 days |
| Aug 17, 1:17 PM PDT | Flood Watch | PSR | Imperial, Riverside, San Bernardino | 4 days |
| Aug 17, 1:31 PM PDT | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 4 days |
| Aug 17, 1:32 PM PDT | Flood Watch | REV | Mono | 5 days |
| Aug 31, 12:54 PM PDT | Flood Watch | VEF | San Bernardino | 59 hr |
| Aug 31, 1:15 PM PDT | Flood Watch | PSR | Imperial, Riverside, San Bernardino | 35 hr |
| Sep 1, 7:54 AM PDT | Flood Watch | SGX | Riverside, San Diego | 11 hr |
| Sep 22, 10:02 AM PDT | Flood Watch | EKA | Del Norte, Humboldt | 3 days |
| Sep 22, 1:11 PM PDT | Flood Watch | MFR | Siskiyou | 3 days |
| Dec 2, 9:43 AM PST | Flood Watch | EKA | Del Norte, Humboldt | 30 hr |
| Dec 5, 3:23 AM PST | Flood Watch | EKA | Del Norte, Humboldt | 43 hr |
| Dec 18, 11:20 PM PST | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 4 days |
| Dec 19, 1:01 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 25 hr |
| Dec 19, 3:53 PM PST | Flood Watch | HNX | Fresno, Kern, Kings | 52 hr |
| Dec 20, 1:48 AM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 12 hr |
| Dec 20, 1:54 PM PST | Flood Watch | SGX | Riverside, San Bernardino, San Diego | 8 hr |
| Dec 20, 1:54 PM PST | Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 56 hr |
| Dec 20, 11:14 PM PST | Flood Watch | PSR | Imperial, Riverside, San Bernardino | 49 hr |
| Dec 21, 11:53 AM PST | Flood Watch | VEF | San Bernardino | 33 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County19
- Riverside County16
- San Diego County12
- Kern County11
- Fresno County10
- Tulare County10
- Orange County10
- Mono County10
- Alpine County9
- El Dorado County9
- Nevada County9
- Placer County9
- Humboldt County8
- Madera County8
- Mariposa County8
- Los Angeles County8
- Santa Barbara County8
- Ventura County8
- Lassen County8
- Plumas County8
- Sierra County8
- Kings County7
- Merced County7
- Marin County6
- Napa County6
- Sonoma County6
- Lake County6
- Mendocino County6
- San Luis Obispo County6
- Alameda County5
- Contra Costa County5
- Monterey County5
- San Benito County5
- City and County of San Francisco5
- San Mateo County5
- Santa Clara County5
- Santa Cruz County5
- Trinity County5
- Modoc County5
- Tuolumne County4
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.