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.

Much-needed rain has begun to fall over Southern California, bringing relief to the drought-stricken region but also the threat of toxic runoff.

Mudflows prompted the closures of at least some roads, including in Topanga Canyon and on parts of the Pacific Coast Highway.

How much rain will fall in LA? Here’s the weekend forecast featuring cool temperatures and rain after more that two weeks of wildfires.

Rain was falling across Southern California on Sunday, bringing some relief to thousands of firefighters who have been battling multiple major wildfires in the LA area.

This file captures the news of the California wildfires from Sunday, Jan. 27. For the latest updates on the fires, follow USA TODAY's coverage for Monday, Jan. 27. Intermittent showers sweeping across Southern California on Sunday provided welcome relief for firefighters battling devastating wildfires but threatened to bring an unwelcome side effect — mudslides.

More rain fell Monday on parts of Southern California after causing mudflows over the weekend, helping firefighters but boosting the risk of toxic ash runoff in areas scorched by Los Angeles-area wildfires.