diarrhea. norovirus is expected to be the cause. flu activity increases across the country. the centers for disease control and prevention say 40 states are now reporting widespread disease activity in the last week alone, 10 children died of flu. avalanches have killed at least five skiers and snowmobilers in the western states over the past few weeks. experts at colorado s avalanche information center now explaining the conditions that can cause major avalanches. alicia is in vail, colorado with the story. we snowshoed our way into the backcountry s 11,000-foot vail summit with an expert mountain near. he says mountain tops and steep slopes dig a pit in the snow. i will dig one. it may take a few minutes.