UPDATE: More Resources Deployed in Search for Missing Truckee Skier Rory Angelotta

TRUCKEE (CBS SF) -- The Placer County Sheriff's Office on Tuesday said challenging weather conditions led to the deployment of additional resources in the ongoing search for missing Truckee skier Rory Angelotta.

According to the sheriff's office, friends of Angelotta reported him missing when he failed to show up for Christmas dinner Saturday evening. Authorities said his car was found in the resort parking lot and his calls went straight to voicemail.

The Placer County Sheriff's social media accounts posted on Tuesday that the
Nevada Air National Guard was using a Blackhawk helicopter equipped with forward-looking infrared capabilities to help searchers in the current extreme weather conditions.

The sheriff's office said other resources deployed to assist in the search included Tahoe Nordic Search and Rescue, Placer County Search and Rescue, Nevada County Search and Rescue, Butte County Search and Rescue, Bay Area Mountain Rescue, Tahoe Backcountry Ski Patrol, and Northstar California Ski Patrol.

The social media posts showed video and images of the search efforts.

The search for 43-year-old Truckee resident Angelotta has been hampered throughout by harsh weather conditions. Angelotta was last seen Saturday morning at the Northstar ski resort.

The investigation has revealed that around 11:30 a.m., Angelotta's ski pass was scanned at the Comstock lift. There was no other activity registered to his pass since that time.

"Searchers responded and combed the mountain and surrounding areas, despite extreme weather," the Placer County Sheriff's Department said. "Rescue personnel were on skis, snowmobiles, and a snowcat during their search. They faced high avalanche danger, strong winds, whiteout flurries, frigid temperatures, and heavy snow loads before calling off their search in the evening."

The sheriff said Angelotta was an experienced skier and was believed to have avalanche equipment on his person.