An avalanche in California's Lake Tahoe region has left 10 backcountry skiers missing, authorities say, with six more people stranded and awaiting rescue.

The avalanche was reported about 11:30PST (19:30GMT) in the Castle Peak area near the town of Truckee, according to the Nevada County Sheriff's Office.

The group of 16 was made up of four guides and 12 clients. Weather conditions remain dangerous, with a high chance of more avalanches.

"Highly-skilled rescue ski teams" have deployed from two nearby ski resorts, the sheriff said. The six known survivors have been "directed to shelter in place as best they can in the conditions," the sheriff added.

"At least six of the skiers have survived the avalanche and remain at the avalanche site, awaiting rescue, with the remaining ten unaccounted for at the time of this release," the sheriff posted on Facebook on Tuesday afternoon.

"A SnoCat team was also launched," the sheriff said, referring to the vehicles that use treads to move in the snow, and are more commonly found grooming snow at ski resorts.

Experts from the nearby Boreal Mountain Ski Resort and the Alder Creek Adventure Center are also attempting to reach the site.

"Rescue efforts remain in progress now with 46 emergency first responders. Weather conditions remain highly dangerous," the statement continued.

The statement also cited a forecast from the Sierra Avalanche Center, which said: "Large avalanches are expected to occur Tuesday, Tuesday night, and into at least early Wednesday morning across backcountry terrain."

The avalanche centre listed the danger rating as "high" - a four out of five on the rating scale.

"Travel in, near, or below avalanche terrain is not recommended today. A widespread natural avalanche cycle is expected over the next 24 hours," the centre said. "Large avalanches may run through treed areas."

The Boreal Mountain Ski Resort, which is nearby to where the accident occurred, has reported 30 inches (76cm) of snowfall in the last 24 hours.

The resort decided to close on Tuesday, because of high wind and low visibility.

The storm has also closed several highways, including Interstate 80 and Highway 50.