Alert archive / California / Flash Flood Warnings / 2021

Flash Flood Warnings in California, September 2021

18 flash flood warnings in September 2021. 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 warnings reaches back to 1986.

Flash Flood Warnings by county

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

Flash Flood Warnings: 18
Busiest day: September 1, 20216 flash flood warnings

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, 5:12 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	6 hr
Aug 31, 5:25 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 31, 5:44 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	96 min
Aug 31, 5:58 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	8 hr
Aug 31, 7:08 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 31, 7:41 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	8 hr
Sep 9, 2:34 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 9, 3:29 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	2 hr
Sep 9, 4:33 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	88 min
Sep 9, 5:47 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Sep 10, 12:19 AM PDT	Flash Flood Warning	LOX	Los Angeles	3 hr
Sep 10, 2:24 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	2 hr
Sep 10, 4:22 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	5 hr
Sep 17, 3:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	5 hr
Sep 24, 8:14 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Sep 24, 12:21 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	56 min
Sep 24, 1:28 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	2 hr
Sep 24, 2:09 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

Nearby

Alerts in force now Tornadoes on record 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. Rebuilt daily.