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recurring pattern of atmospheric circulation associated with characteristic weather, such asa cyclone or anticyclone
air moves slowly which allows the air to acquire similar temp and humidity characteristics from the region
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
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)
slow moving trough of low pressure within the belt of tropical easterlies. occurs in 5-30 deg latitude N and S
Tropical Cyclone conditions
start from tropical depressions which have 40mph winds, then intensify into tropical storms becoming a tropical storm at 74mph wind speeds
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