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What is an airmass?
A large body of air with similar temperature and humidity characteristics in any horizontal direction at any given altitude.
What are the characteristics of an Arctic airmass?
Extremely cold, dry, stable air over land with an ice and snow covered surface.
What defines a Polar airmass?
Cold, dry, and stable over land.
What are the characteristics of a Tropical airmass?
Hot, dry, stable air aloft with unstable surface air.
What defines a Maritime Polar airmass?
Cool, moist, and unstable air.
What are the characteristics of a Maritime Tropical airmass?
Warm, moist, usually unstable air.
What should the source regions of an airmass be like?
They should be flat and uniform.
What affects the strength of properties acquired by an airmass?
The length of stay in the source region.
What is a front?
The boundary between two different air masses.
What is frontogenesis?
The formation of a front.
What is frontolysis?
The death of a front.
What does FROPA stand for?
Frontal Passage.
What can a frontal analysis reveal?
Sharp temperature and moisture gradients, shift in wind direction, pressure patterns, pressure changes, and cloud and precipitation patterns.
What is a cold front?
The boundary of an advancing mass of cold air that replaces warm air, characterized by a steep leading edge and strong upward motion.
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