Alert archive / California / Flash Flood Warnings / 2026

Flash Flood Warnings in California, August 2026

25 flash flood warnings in August 2026. 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 August 2026. Tap one for its archive.

Flash Flood Warnings: 25
Busiest day: August 11, 202610 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 8, 4:47 PM PDT	Flash Flood Warning	REV	Mono	118 min
Aug 9, 5:54 PM PDT	Flash Flood Warning	SGX	San Diego	60 min
Aug 10, 3:21 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	117 min
Aug 10, 7:22 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	113 min
Aug 11, 1:08 PM PDT	Flash Flood Warning	LOX	Ventura	3 hr
Aug 11, 1:54 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	2 hr
Aug 11, 2:13 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	109 min
Aug 11, 2:53 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	67 min
Aug 11, 2:54 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	66 min
Aug 11, 3:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 11, 4:18 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 11, 4:24 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Aug 11, 4:42 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 11, 6:46 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 12, 1:55 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 12, 4:00 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Aug 12, 4:01 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Aug 12, 4:35 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	3 hr
Aug 12, 6:25 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	5 hr
Aug 12, 6:39 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 12, 8:04 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 13, 1:23 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 15, 3:44 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Aug 15, 4:16 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Aug 15, 4:46 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	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 2025

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.