As I've said many times, sailors are notorious exaggerators, and the wind and waves always seem to get a little higher and stronger after a few drinks. The video below is what I consider a lot of wind. I posted this video on YouTube a few years ago as an experiment, and I'm shocked that over twenty thousand people have watched it, which I guess isn't that many in the YouTube world.
To answer nitty-gritty questions, this was at Peninsula Tamar, at the Boca Occidental of the Straits of Magellan, with a typical low pressure system blowing through. Captain Slocum waited out weather here and/or just across the strait for over a month before he could get through. Winds were very gusty, but something like 50 knots.
Please ignore my muffled ramblings. Cabin fever had set in.