Ch11_Airmass-front_107

Ch11_Airmass-front_107 - Ch. 11 Air Masses and Fronts 11. 1...

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11. 1 Air Masses 11. 2 Fronts Ch. 11 Air Masses and Fronts Ch. 11 Air Masses and Fronts https://pao.cnmoc.navy.mil/pao/Educate/WeatherTalk2/indexairmasse.htm
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The global atmosphere is made of various air masses with relatively uniform meteorological properties such as temperature, humidity, wind, etc. The movement of masses around globe causes weather changes. Overview Overview http://www.weatherquestions.com/What_is_an_air_mass.htm The boundaries between different air masses are called fronts. Active weather events often occur along these transition frontal zones. Tracking the movement and development of air masses and fronts is the key in weather forecasts.
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An air mass is an extremely large body of air with relatively similar temperature and humidity characteristics covering thousands of kilometers in any horizontal direction. Air masses originate from their source regions where overlying air acquires surface temperature and moisture. Source regions are large and flat – provide long paths of uniform composition – keep same surface properties with light winds – overlying air is stagnant 11.1 Air Masses 11.1 Air Masses Ideal source regions with these properties are Ice- or snow-cover arctic plains in winter Subtropical oceans in summer But not middle latitudes! http://www.physicalgeography.net/fundamentals/7r.html
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Air masses are usually classified according to their source regions that determine their temperature and humidity . Combining two temperature regions (polar & tropic) and two moisture regimes (continental & marine) results in four general categories of air masses. Air Masses Classification
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Ch11_Airmass-front_107 - Ch. 11 Air Masses and Fronts 11. 1...

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