In meteorology, when a cold one has a close encounter with a warm one & takes it over, it's called an occluded one
[DOC] [TLE] This air mass is characterized by - Atmospheric Sciences - Texas ... [PAR] Continental Polar (cP): Continental Polar air masses are also cold to cool and dry
, but ... Continental Tropical : These are the hot, dry air masses which originate 
over ... is often called the dry line where it encounters the maritime tropical air 
mass, .... one on each side of the front you have chosen and fairly close to the 
front.