ESS124
Prof.
Jin-Yi Yu
January
Warm Air Masses
•The centers of very warm air masses appear as semi-permanent
regions of low pressure
on surface weather maps.
•In summer, low-pressure areas appear over desert areas such as
American Southwest,
Southeast Asia, Central Africa, and near the equator.
•In winter, the semi-permanent low-pressure appear over the
northern Pacific (Aleutian
low) and northern Atlantic (Icelandic Low).
July