MONTEREY, Calif. (AP) — Crews searched by sea and air and sought the public's help Monday as they ramped up their efforts to find a husband and wife and two young children who sent a series of distress calls to the Coast Guard the day before, saying their sailboat was sinking far off the Central California coast and they were fashioning a raft from a cooler and a life ring.

The unidentified family had been sailing a small vessel west of Monterey Bay, where strong winds, cold water and big swells made for perilous conditions. Forecasters had issued a weekend advisory warning boaters of rough seas in the area.

The group — which included two children under 8 — made its first distress call late Sunday afternoon, Coast Guard Lt. Heather Lampert said. Investigators used the boat's radio signal and radar to determine the call came from an area about 60 miles west of Monterey, she said.