On Mon, 16 Apr 2007 06:46:08 -0700, Joe wrote:
 I'm just north of Galveston, sail the Gulf of Mexico mostly. Williwaw is
 a term I've heard from an engineer from Michigan who wroked for me on
 the supply boats, not a term used here much. I figured it might be a
 term someone from the NE would understand. Here in the gulf we call them
 fronts, microburst's and t storms.
Different phenomenon.  A true williwaw is associated with mountains.
http://en.wikipedia.org/wiki/Katabatic_wind