Typically, Northern Air wind events, such as today's one and Friday's peak, are triggered by high pressure moving into the Great Basin Four Corners region.
Looking at this image, you can see that today's high pressure is actually quite far to the north, and the northerly winds blowing from the high pressure into the Sea of Cortez are very weak. So why is there a strong north wind? Looking at the bottom of the image, note the large area of low pressure south of Cabo and how it accelerates wind speeds. Typically, low pressure is much weaker in this area, and we need strong high pressure in the 4 Corners area to produce strong northerly winds. But who's complaining!
