SP11%20Ch8%20%20Air%20Masses%2C%20Fronts%20_%20Mid%20Lat%20Cyclones

SP11%20Ch8%20%20Air%20Masses%2C%20Fronts%20_%20Mid%20Lat%20Cyclones

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Ch. 8 Air Masses, Fronts, & Middle-Latitude Cyclone Air Masses Extremely large bodies of air whose temperature and humidity are similar horizontally and vertically. Source Regions: area where air mass originates, usually flat and uniform composition with light surface winds Classification based upon temperature and humidity P = polar T = tropical A = Arctic m = maritime c = continental What kind on air mass is associated with a given type of weather in a given region and time of year? Fronts - Transition zone between two air masses of different densities Identification on Charts 1. Sharp temperature change 2. Sharp change in dew point 3. Shift in wind direction 4. Sharp pressure change 5. Clouds and precipitation Stationary Front - Front with no movement - Alternating red and blue line with blue triangles and red semi-circles - Winds parallel but opposite direction - Variable weather Cold Front - Cold, dry stable air replaces warm, moist unstable air - Blue line with blue triangles - Clouds of vertical development
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