willywaw

from The Collaborative International Dictionary of English v.0.48

Williwaw \Wil"li*waw\, Willywaw \Wil"ly*waw\, n. (Naut.)
   A whirlwind, or whirlwind squall, encountered in the Straits
   of Magellan. --W. C. Russell.
   [1913 Webster]