The marine layer is making a strong comeback this morning, bringing that familiar coastal gray to many areas and setting us up for a much cooler week ahead. The marine layer is about 800 feet deep and should start lifting by late morning, though some beaches may stay socked in longer than our coastal valleys. We have one active alert: a Coastal Flood Advisory in effect from 6 PM tonight through Wednesday night for our south coast beaches. High astronomical tides up to 7.5 feet combined with southerly swells could cause minor flooding in low-lying coastal areas, parking lots, and walkways. The marine layer will become more robust through midweek, with coastal clouds pushing into the Santa Ynez Valley, Cuyama Valley, and even reaching Atascadero by Wednesday morning.