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Air Masses John Harris - Head of Geography - Radley College - UK [email_address] http://geography.radley.org.uk
What is an air mass? An air mass is a large body of air with similar  temperature  and/or  humidity . Air masses form in stable  source regions  such as in the sub tropics or near to the poles.
Air Mass  types Five main air masses affect Europe
Air mass classification   Tropical Maritime (Tm)  - mild and moist Tropical Continental (Tc)  - warm and dry Polar Maritime (Pm)  - cool and moist Polar Continental (Pc)  - cold and dry Arctic Maritime (Am)  - cold and moist
Tropical Maritime Tm air masses  come from the south west and originate over the Azores or the Caribbean. They bring mild, damp, cloudy weather.
Tropical Continental Tc air masses  come from the south and originate over dry northern Africa . They bring hot, dry weather and summer heatwaves.
Polar Maritime Pm air masses  come from the north-west  and originate over the north Atlantic. They bring cool, moist conditions.
Polar Continental Pc air masses  come from the east  and originate over Scandinavia and Russia . They bring clear dry conditions - cold in winter, warm in summer.
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Airmass

  • 1. Air Masses John Harris - Head of Geography - Radley College - UK [email_address] http://geography.radley.org.uk
  • 2. What is an air mass? An air mass is a large body of air with similar temperature and/or humidity . Air masses form in stable source regions such as in the sub tropics or near to the poles.
  • 3. Air Mass types Five main air masses affect Europe
  • 4. Air mass classification Tropical Maritime (Tm) - mild and moist Tropical Continental (Tc) - warm and dry Polar Maritime (Pm) - cool and moist Polar Continental (Pc) - cold and dry Arctic Maritime (Am) - cold and moist
  • 5. Tropical Maritime Tm air masses come from the south west and originate over the Azores or the Caribbean. They bring mild, damp, cloudy weather.
  • 6. Tropical Continental Tc air masses come from the south and originate over dry northern Africa . They bring hot, dry weather and summer heatwaves.
  • 7. Polar Maritime Pm air masses come from the north-west and originate over the north Atlantic. They bring cool, moist conditions.
  • 8. Polar Continental Pc air masses come from the east and originate over Scandinavia and Russia . They bring clear dry conditions - cold in winter, warm in summer.