Conversation so far:
Where did Ferdinand Magellan leave from?
Ferdinand Magellan's fleet left Spain on 20 September 1519, sailing west across the Atlantic toward South America.
When did Ferdinand Magellan leave?
Ferdinand Magellan's fleet departed on 20 September 1519.
What was the trip like across the Atlantic for Ferdinand Magellan?
After three months of searching, weather conditions forced Ferdinand Magellan's fleet to stop their search to wait out the winter.

Question: what conditions?
Self-contained rewrite: What were the weather conditions that Ferdinand Magellan's fleet had to face?