NORDEN, Calif. (AP) — Crews have resumed their search for a ski instructor who went missing at a Northern California ski resort.

The Placer County Sheriff’s Office says search-and-rescue teams are focusing on an avalanche slide area where the phone of 23-year-old Carson May lasted pinged.

The office said Sunday ground searches have been deployed but that a helicopter is on standby until the weather clears.

May was last seen skiing while off duty on Thursday afternoon at Sugar Bowl Ski Resort near Norden. He was supposed to get a ride home but didn’t show up.

Friends reported him missing Friday morning after he didn’t make it home and his belonging were discovered in his locker at the ski resort.