A skier said he was on the slopes with his family at the Glencoe Ski Centre all day and saw the rescue mission unfolding.
Mark Fulton, 25, from Inverclyde, said he and his family went in to get some food from the cafe at lunchtime and saw an emergency helicopter "hovering about".
Mr Fulton said:
It looked as though it was coming in to land near the bottom of the hill. When we were leaving later I saw police and mountain rescue vans all gathered as well.
I didn't actually know there had been an avalanche until I was driving home and heard it on the radio.
It's just not something you think about when you're going out skiing, you never think something like that will happen to you - it's like when you get on a plane, you don't think it's going to crash.
I just hope the person is found safe and well.
More top news
The helicopter, which the royal was not in at the time, avoided a potentially deadly mid-air crash.
The shots on a bus sparked a major security scare as weekend tourists in some of the world's most famous casinos were told to bunker down.
The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".