chapter8gh - Chapter 8: Air Masses Regional Formation...

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1 Chapter 8: Air Masses Regional Formation Movement: North America Influence on Weather Air Mass : - immense body of air (1600km across, several km thick) -homogeneous physical properties temperature moisture content -migration & influence Air Mass Weather : - migration and regional influence -conditions may exist for several days, consistent weather -many disturbances, originate along air mass boundaries Source Region : areas in which air mass originates homogeneous surface extensive geographic region stagnant atmospheric circulation attain equilibrium with the surface slow moving anticyclones Low pressure systems are not good because surface convergence brings several unlike air masses together (mixing) Source Regions for North American Air Masses mT, cT : warm mP, cP, cA: cold mid latitudes are zones of classing air masses = stormy Classifying Air Masses : influenced by latitude and surface Temperature High latitude = cold, low latitude = warm P- P o l a r A -Arctic :similar to polar just colder T -Tropical Humidity m -Maritime -wet c -Continental -dry
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chapter8gh - Chapter 8: Air Masses Regional Formation...

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