(NEW YORK) — A storm is dropping rounds of heavy rain on more than 22 million people across Southern California on Saturday, and the rainfall could spark dangerous flash flooding, mudslides and debris flows.

Here’s the latest:

The first round of heavy rain is slamming the region early Saturday morning, and the second round will hit between 11 a.m. and 4 p.m. local time.

Rainfall rates could top 1 inch per hour and scattered thunderstorms could bring strong winds, lightning and potentially hail.

Flood watches are in effect in Los Angeles, Santa Barbara, Riverside and San Diego through Saturday evening. A level 3 out of 4 risk for excessive rainfall and flash flooding is in place for the LA and Santa Barbara areas.

Wildfire burn scar areas are of serious concern on Saturday because they

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