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19 Cards in this Set

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Air mass
An extensive body of air that has relatively uniform properties in the horizontal dimension and moves as an entity.
Source region
A part of Earth’s surface that is particularly suited to generate air masses.
Front
A zone of discontinuity between unlike air masses
Warm front
The leading edge of an advancing warm air mass.
Cold front
The leading edge of a cool air mass actively displacing warm air.
Stationary front
The common boundary between two air masses in a situation in which neither air mass displaces the other.
Occluded front
A complex front formed when a cold front overtakes a warm front.
Midlatitude cyclones
Large migratory low-pressure system that occurs within the middle latitudes and moves generally with the westerlies. Also known as extratropical cyclones and wave cyclones.
Midlatitude anticyclone
An extensive migratory high-pressure cell of the midlatitudes that moves generally with the westerlies.
Tropical cyclone
A storm most significantly affecting the tropics and subtropics, which is intense, revolving, rain-drenched, migratory, destructive, and erratic. Such a storm system consists of a prominent low-pressure center that is essentially circular in shape and has a steep pressure gradient outward from the center. When wind speed reaches 64 knots, they are called hurricanes in North America and the Caribbean.
Typhoons
The term used for tropical cyclones affecting the western North Pacific region.
Baguio
The term used for a tropical cyclone affecting the Philippines.
Cyclone
Low pressure center
Eye
The nonstormy center of a tropical cyclone
Eye Wall
Peripheral zone at the edge of a tropical cyclone eye where winds reach their highest speed.
Continental Polar
An air mass in the midlatitudes that comes in summer and winter. In the winter it brings very cold, dry, and clear weather. Generally seen in regions like Siberia.
Maritime Polar
An air mass in the midlatitudes that brings weather that is cool/cold, moist, and cloudy. Generally seen in regions like Alaska and Seattle.
Maritime Tropical
An air mass in the midlatitudes that brings warm weather that is very moist and often unstable. Generally proceeds from the Gulf of Mexico.
Continental Tropical
An air mass in the midlatitudes that brings hot, dry weather and clear skies. Generally seen in Northwest Mexico and the Southern United States.