Air Masses

An Air Mass is a large volume of air which travels from one area to another. The weather an air mass brings is determined by the region it has come from and the type of surface it has moved over.

The five main air masses

There are 5 main Air Masses which affect The British Isles. You will need to be able to identify them and their characteristics.

5 arrows on a map pointing to the UK

To describe and explain the weather that air masses bring , think about the following:

  1. Where has your air mass come from: is it the Arctic Circle, the North Pole or the Tropics?
  2. Has the air mass passed over sea or land?

The two pieces of information above will help you name the air mass and describe its characterists. The basic ideas are as follows:

 

Source Area Characteristics
Land Dry
Oceans Wet
Tropics Warm
Arctic Cold
 

Weather Characteristics

You should memorise the information in the table below to make sure that you can correctly identify the weather characteristics of air masses from each source area.

 

Name Source Area Weather Characteristics
Tropical Maritime (mT) Atlantic Ocean Warm and wet
Tropical Continental (cT) Southern Europe and North Africa Warm and dry
Polar maritime (mP) North Atlantic Cold and wet
Polar Continental (cP) Northern Europe Cold and dry
Arctic Martime (mA) Arctic Ocean Very Cold. Not always wet due to low humidity

Now look again at the map below. Make sure that you can name the 5 air masses and describe their characteristics. The source area will help you explain why each air mass has that particular characteristic.

5 arrows on a map pointing to the UK

Note!

The temperature of an Air Mass is also determined by seasonal changes. Temperatures in Summer months are always higher than in Winter months.

The Air Mass known as The Arctic Maritime does not occur very often, but when it does it brings with it heavy snow.

 

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