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Clouds
Fronts
100
Cloud forming a continuous horizontal gray sheet, often with rain or snow.
What is stratus?
100
The boundary of an advancing mass of cold air
What is a cold front?
200
Cloud forming wispy filamentous tufted streaks at high altitude, usually 16,500–45,000 feet (5–13 km).
What is Cirrus?
200
The boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system
What is a warm front?
300
A cloud forming rounded masses heaped on each other above a flat base at fairly low altitude.
What is cumbulus?
300
A transition zone between two nearly stationary air masses of different density
What is a stationary front?
400
A cloud forming a towering mass with a flat base at fairly low altitude and often a flat top, as in thunderstorms
What is cumulonimbus?
400
A composite front formed when a cold front overtakes a warm front and forces it aloft
What is an occluded front?
500
A type of cloud forming a thick uniform gray layer at low altitude, from which rain or snow often falls.
What is nimbostratus?
500
The semipermanent, semi-continuous front between the deep, cold arctic air and the shallower, basically less cold polar air of northern latitudes
What is an artic front?