The gales in this region were especially violent and seemingly appeared out of nowhere. The “great storm” of which Pigafetta spoke is called a “williwaw,” and it is peculiar to the strait. A williwaw occurs when air, chilled by the glaciers surrounding the strait, becomes unstable and suddenly races down the mountains with ever-increasing velocity. By the time it reaches the fjords, it creates a squall so powerful that it never fails to terrify and disorient any sailor unlucky enough to be caught in its grip.
