Slides in Air Masses Ch. 3
AN AIR MASS IS A HUGE BODY OF AIR THAT HAS SIMILAR TEMPERATURE, HUMIDITY, AND AIR PRESSURE THROUGHOUT.
WRITE IT DOWN.
Air masses are classified according to two characteristics:
1. TEMPERATURE - Whether an air mass is warm or cold depends on the region over which the air mass forms. TROPICAL Air Masses are warm and form in the tropics. They have low pressure. Polar air masses form close to the poles and have high air pressure.
If an air mass is humid it is called: MARITIME
because it forms over water.
If an air mass is dry it is called: CONTINENTAL because it forms over land.
MARITIME TROPICAL - Warm humid air masses that form over oceans near the tropics such as the Gulf of Mexico
MARITIME POLAR - cold, humid air masses that form over the icy cold North Pacific and Atlantic
CONTINENTAL TROPICAL - Hot, dry air masses that form only in summer over dry areas of the Southwest (such as Arizona) and northern Mexico.
CONTINENTAL POLAR - form over central and northern Canada and Alaska.