Alert archive / California / Flash Flood Watches
Flash Flood Watches in California, 2017
50 flash flood watches in 2017. 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 flash flood watches reaches back to 2005.
Flash Flood Watches by county
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Flash Flood Watches
- 50
- Busiest month
- January18 flash flood watches
- Busiest day
- February 15, 20174 flash 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, 12:44 PM PST | Flash Flood Watch | HNX | 252 days | |
| Jan 3, 11:59 AM PST | Flash Flood Watch | MTR | Monterey, San Mateo, Santa Clara, Santa Cruz | 25 hr |
| Jan 5, 8:50 AM PST | Flash Flood Watch | HNX | 6 days | |
| Jan 6, 3:26 AM PST | Flash Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, City and County of San Francisco and 4 more | 3 days |
| Jan 7, 1:02 PM PST | Flash Flood Watch | LOX | 14 hr | |
| Jan 8, 11:55 AM PST | Flash Flood Watch | LOX | Los Angeles | 19 hr |
| Jan 8, 4:37 PM PST | Flash Flood Watch | STO | 37 hr | |
| Jan 9, 2:39 PM PST | Flash Flood Watch | MTR | Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz and 1 more | 37 hr |
| Jan 12, 3:39 AM PST | Flash Flood Watch | LOX | Los Angeles | 17 hr |
| Jan 12, 3:41 PM PST | Flash Flood Watch | STO | 71 hr | |
| Jan 18, 2:46 PM PST | Flash Flood Watch | LOX | Los Angeles | 18 hr |
| Jan 19, 2:38 PM PST | Flash Flood Watch | LOX | Los Angeles | 27 hr |
| Jan 19, 2:46 PM PST | Flash Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 28 hr |
| Jan 20, 1:27 PM PST | Flash Flood Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 3 days |
| Jan 21, 11:17 AM PST | Flash Flood Watch | LOX | Los Angeles, Santa Barbara | 55 hr |
| Jan 21, 1:00 PM PST | Flash Flood Watch | HNX | 45 hr | |
| Jan 21, 1:44 PM PST | Flash Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 55 hr |
| Jan 23, 11:13 AM PST | Flash Flood Watch | HNX | 8 hr | |
| Feb 6, 9:17 AM PST | Flash Flood Watch | MTR | Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz and 1 more | 31 hr |
| Feb 7, 4:58 PM PST | Flash Flood Watch | MFR | Siskiyou | 47 hr |
| Feb 8, 9:18 AM PST | Flash Flood Watch | MTR | Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz and 1 more | 41 hr |
| Feb 11, 7:09 PM PST | Flash Flood Watch | STO | 17 hr | |
| Feb 14, 11:29 AM PST | Flash Flood Watch | STO | 54 hr | |
| Feb 15, 1:43 PM PST | Flash Flood Watch | LOX | Los Angeles, Santa Barbara | 68 hr |
| Feb 15, 1:47 PM PST | Flash Flood Watch | HNX | 62 hr | |
| Feb 15, 1:54 PM PST | Flash Flood Watch | VEF | Inyo, San Bernardino | 3 days |
| Feb 15, 2:07 PM PST | Flash Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 71 hr |
| Feb 16, 6:55 AM PST | Flash Flood Watch | PSR | 68 hr | |
| Feb 20, 12:05 PM PST | Flash Flood Watch | STO | 12 hr | |
| Feb 21, 7:20 AM PST | Flash Flood Watch | STO | 13 days | |
| Feb 27, 2:34 AM PST | Flash Flood Watch | SGX | San Diego | 23 hr |
| Jul 18, 3:29 AM PDT | Flash Flood Watch | VEF | San Bernardino | 41 hr |
| Jul 24, 3:44 AM PDT | Flash Flood Watch | VEF | San Bernardino | 40 hr |
| Jul 24, 11:59 PM PDT | Flash Flood Watch | VEF | San Bernardino | 20 hr |
| Jul 25, 3:40 AM PDT | Flash Flood Watch | REV | Modoc | 17 hr |
| Aug 1, 5:12 AM PDT | Flash Flood Watch | LOX | Los Angeles, Santa Barbara | 63 hr |
| Aug 1, 12:56 PM PDT | Flash Flood Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 54 hr |
| Aug 3, 2:27 AM PDT | Flash Flood Watch | VEF | Inyo, San Bernardino | 21 hr |
| Aug 5, 10:53 AM PDT | Flash Flood Watch | REV | Alpine, El Dorado, Lassen, Modoc, Mono, Nevada and 3 more | 9 hr |
| Aug 6, 2:48 AM PDT | Flash Flood Watch | REV | Lassen, Modoc, Plumas, Sierra | 18 hr |
| Aug 8, 3:10 AM PDT | Flash Flood Watch | REV | Lassen, Modoc, Plumas, Sierra | 12 hr |
| Aug 9, 3:14 AM PDT | Flash Flood Watch | REV | Lassen, Modoc, Plumas, Sierra | 19 hr |
| Aug 22, 9:10 AM PDT | Flash Flood Watch | MFR | Modoc, Siskiyou | 14 hr |
| Sep 3, 1:07 PM PDT | Flash Flood Watch | LOX | Los Angeles | 8 hr |
| Sep 6, 9:54 AM PDT | Flash Flood Watch | MFR | Siskiyou | 31 hr |
| Sep 7, 2:10 PM PDT | Flash Flood Watch | PSR | Imperial, Riverside, San Bernardino | 54 hr |
| Sep 7, 2:10 PM PDT | Flash Flood Watch | VEF | San Bernardino | 55 hr |
| Sep 9, 5:38 AM PDT | Flash Flood Watch | LOX | Los Angeles, Santa Barbara | 47 hr |
| Oct 18, 3:04 AM PDT | Flash Flood Watch | MFR | Siskiyou | 44 hr |
| Nov 14, 10:07 AM PST | Flash Flood Watch | MTR | Marin, Napa, Sonoma | 41 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County11
- Los Angeles County9
- Monterey County6
- San Mateo County6
- Santa Clara County6
- Santa Cruz County6
- Marin County6
- Napa County6
- Sonoma County6
- Modoc County6
- Riverside County5
- San Diego County5
- Orange County4
- Santa Barbara County4
- Siskiyou County4
- Lassen County4
- Plumas County4
- Sierra County4
- Alameda County2
- Contra Costa County2
- City and County of San Francisco2
- Inyo County2
- San Benito County1
- Alpine County1
- El Dorado County1
- Mono County1
- Nevada County1
- Placer County1
- Imperial County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.