Normally, air should move directly from high pressure to low pressure, but because of Coriolis, the motion is actually a spiral. We will talk more about that next lecture. This water is then deflected by Coriolis off shore and cold water wells up to replace this water traveling offshore. Both of these factors account for the cold water along the coast that is so important to advection fog formation. Low moves counter-clockwise and inward while wind direction around a surface High moves clockwise and outward.
Divergence aloft tends to be associated with surface low pressure area development.
There are two ways, one of which is related to the heating and cooling patterns over the globe. For example, during the summer the surface of the continent is the site of low pressure.