West Coast Wind Blog: San Francisco’s Elongated Eddy Pattern

by Mike Godsey, mikeATiwindsurf.com

Perhaps you noticed that our wind patterns keep on changing as the pattern of upper-level winds change.

One new feature that is appearing is nagging long thin eddies that run along the coast creating southerly flow and favoring sites from about the Stick northward.

For lack of an official label, I have taken to calling them Elongated Eddies. Today’s satellite animation shows what they look like.

This type of eddy has support aloft from 975 MB. to 850 MB so they tend to last all day.

Watch how the curve of the fog pattern swings back and forth in the Pt. Isabel to Berkeley zone. Do you see why it is so hard to forecast in advance where the winds will be strongest in advance?