LOS ANGELES (AP) — Rain eased on Monday after Southern California’s first significant storm of the season brought weekend downpours that aided firefighters but caused ash, mud and debris to flow across streets in wildfire-burned areas, while heavy mountain snow forced the shutdown of a major interstate north of Los Angeles.

The wet weather will bring relief to Southern California after a prolonged period of dryness, but there’s concern that any bursts of heavy rainfall could cause flooding.