A hugh body of air that has the same temperature, humidity, and air pressure at any given height; A single air mass may spread over millions of square km and be up to to 10 km deep.

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f1) form north of 50 degrees N latitude and south 50 degrees S latitude, and2) have have high air pressure
1. Maritime air masses: form over oceans/ water evaoporates from oceans, so the air can become very humid2)Continental air masses: form over land; have less exposure to large amounts of moisture from bodies of H2O.; ergo, are more drier than maritime air masses
1. Warm humid air masses form over tropical oceans.2. Maritime tropical air masses that form over the Gulf of Mexico and the Atlantic Ocean move 1st toward SE US.3. They then move N and NE, where they influence weather in the central and eastern US.4. In the west, maritme tropical air masses form over the Pacific Ocean and mainly affect weather on the West Coast; as they cross the coastal mountain ranges, the Pacific air masses lose moisture.5. In summer, maritime tropical aire masses usually bring hot, humid weather.6. Many summer showers and thunderstorms in the eastern US develop in air masses that have formed over the Gulf of Mexico;7. In winter, humid air mass can bring heavy rain or snow.
1. Cool, humid air masses from over icy cold N. Pacific and N. Atlantic oceans2. Maritime polar air massesd affect the west Coast mor then the East Coast3. Even in summer, these masses of cool, humid air often bring fog, rain,a nd cool temperatures to the West Coast




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