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Air Masses

Large bodies of air with uniform temp and moisture characteristics

Weather Systems

recurring pattern of atmospheric circulation associated with characteristic weather, such asa cyclone or anticyclone

Source Region

air moves slowly which allows the air to acquire similar temp and humidity characteristics from the region


contact between two unlike air masses

Cold Front

cold air masses moving underneath warm air mass causing the latter to be lifted. cold air is more dense so it stays near the ground

Warm Front

warm air moves into a cold air mass and the cold air retreats

Occluded Fronts

cold air front takes over warm air and moves it above the cold air

Polar Front

where a polar and tropical air masses are in contact


center of low atmospheric pressure


center of high atmospheric pressure

Midlatitude Cyclone

cold and warm fronts interacting and traveling in the midlatitudes. cold air from the north meets with warm air from the south. dissolves

Tropical Cyclone (hurricane)

forms between 10 and 20 deg N and S latitude, wind speeds 30-50 m/s (65-135 mph)

Easterly Wave

slow moving trough of low pressure within the belt of tropical easterlies. occurs in 5-30 deg latitude N and S

Weak equatorial low

disturbance near equatorial trough, air masses converge creating storms

Tropical Cyclone conditions

start from tropical depressions which have 40mph winds, then intensify into tropical storms becoming a tropical storm at 74mph wind speeds

Eye of hurricane

center of hurricane, clam clear skies

Source Region

area where a large air mass derives it's temperature and moisture characteristics

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