LOS ANGELES, CA — Rain will make a comeback in the Southland this week, with two storm systems out of the Pacific Northwest headed for the region, the National Weather Service said Monday.

Light rain may fall Monday evening followed by showers Tuesday, producing a quarter-inch of rain at the start of what promises to be an "unsettled week," said NWS meteorologist Rich Thompson from his monitoring station in Oxnard.

But a "much stronger" storm is expected to douse the region Thursday and Friday, generating rain and snow in the San Gabriel Mountains, he said. Predictions regarding that system are still being developed, but the NWS said it could trigger mud slides and debris flows down slopes previously stripped of vegetation by wildfires, along with treacherous mountain driving conditions. Precipitation could be heavy at times Friday or Saturday, according to the weather Service.