Very common air mass that comes from the Arctic, picks up moisture producing precipitation and convectional rainfall in summer, air becomes unstable as it passes over Atlantic
Pm air is cold and moist
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Tropical Maritime
Common, comes from S. Atlantic Ocean, warm air can hold lots of vapour brining lots of rain, mild in winter, warm, wet in summer, causes drizzle and fog
Tm bring warm and moist conditions
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Polar Continental
Common in winter, comes from N. Europe, cold in winter, mild in summer, air is unstable in winter, can bring snow, dry but cold
Pc brings cold and dry conditions
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Tropical Continental
Rare, comes from N. Africa across Med, warm dry ar, mild in winter, heat waves in summer, can cause thunderstorms in summer
Tc brings warm and dry conditions
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Arctic
Comes from Arctic, brings cold and wintry conditions
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