Three climbers who were among scores who scaled Mount Everest over the weekend died on their descent and two more are missing, a Nepalese official said Monday. The first clear weather conditions of the spring climbing season were Friday and Saturday, but a windstorm swept the higher altitudes of the mountain by Saturday afternoon, said Gyanendra Shrestha of Nepal's Mountaineering Department. An estimated 150 climbers reached the summit on either day, most of them on Saturday, according to a report of the Associated Press.