West Coast Wind Blog: North Pacific High finally makes a move on San Francisco IF Southern California Cut-Off Low moves southward.

by Mike Godsey

The satellite animation below shows a large counter-clockwise spinning Cut-Off Low over Southern California at ≈ 18,000 ft. Notice the fast-moving gravity waves rippling westward and northward from this disturbance.

Further north the North Pacific High’s surface NW winds are being bumped towards San Francisco. But for this to happen tomorrow, Saturday, May 11, we need this Cut-Off Low to move southward as suggested by the models.  Remember Cut-Off Lows are very hard to forecast.