Deseret News By Lindsay Whitehurst Jeffrey D. Allred, Deseret News SALT LAKE CITY — A skier caught in an avalanche that killed four people in Utah survived by clinging to a tree through the onslaught of rushing snow and later helped save two people, a forecaster investigating the slide said. The avalanche on Saturday initially buried six skiers from two separate groups. When the snow stopped moving, a surviving skier let go of the tree and was joined by another skier from his group in the search for others, forecaster Drew Hardesty with the U.S. Forest Service Utah Avalanche Center said Tuesday.