The conditions that led to fatal avalanches in the Washington Cascades could get worse this week. Three expert skiers died near Stevens Pass on Sunday and a snowboarder died in a separate avalanche near Snoqualmie.
Mark Moore is the director of the Northwest Weather and Avalanche Center. He says a crystalline layer of frost prevented new snow from bonding with the bottom layers. He estimates that led to hundreds if not thousands of avalanches in remote areas over the weekend.