How do we forecast weather on Everest?

Clouds at Everest Base Camp clear to show the peak of Nuptse.

Getting caught in a storm on Everest can be dangerous for climbers, especially towards the summit. The final push from base camp takes at least 4 days, and it’s important for safety that there is a clear window of good weather for the entire period.

Improvements in weather forecasting have made a huge difference to safety on Everest, but what has caused this improvement, and what are the specific challenges on Everest?

How do we fo...