qOcclusion: the warm air
is cut off from the surface by the
meeting of two fronts.
qUsually, a fast-moving
cold front catches a slow-moving
warm front.
qA cold-type occlusion: eastern half of the continent where
a cold front associated with cP air
meets a warm front with mP air
ahead.
qA warm-type occlusion: western edges of continents
where the cold front, associated with
mP air, invades an area in
which colder cP air is entrenched.