Unstable snow.

Good for the past several days, the weather is beginning its inevitable change. It is cold and windy and the clouds have moved in. The high-camp team slept last night at a location just below its planned destination at Camp IV. There are crevasses to be negotiated and, to be safe, this is careful, slow work and will take time for a prudent team of climbers. The high-altitude drilling team has many weeks ahead of it. In this, it differs from a mountain-climbing team that can move up fast, then promptly come off the mountain and recover in gentler conditions.