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.

There is a 10% to 20% chance of flash flooding and landslides in some recently burned areas of Los Angeles County, forecasters say, including the Palisades and Eaton fire areas.

Rain was falling on the region Sunday and is expected to get heavier overnight, according to a Sunday afternoon forecast from the National Weather Service. Los Angeles and Ventura counties may get as much as 1.25 inches (3.2 centimeters) through Monday, with as much as 2 inches in the mountains.

A cold system will arrive in the Los Angeles area Saturday afternoon, bringing the possibility of rain through Monday morning, and increasing the potential for mudslides and debris flow.

The National Weather Service issued a flood watch effective from 4 p.m. Sunday to 4 p.m. Monday for areas in or near burn scars created by the Palisades Fire, Eaton Fire, Hughes Fire and Bridge Fire, the latter blaze of which burned 56,000 acres last fall.