Air masses form when large masses of air lay stagnant

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Air masses form when large masses of air lay stagnant over a source region A source region is a large and generally flat areas of land/ocean with uniform properties 4. What are the two (2) moisture classifiers for North American air masses? Briefly describe each. Maritime (moist): form over water, Continental (dry): form over land 5. What are the three (3) temperature classifiers for North American air masses? Briefly describe each. Arctic (Cold) Polar (cool) Tropical (warm) 6. What would be the typical temperature and moisture characteristics of each of the following North American air masses (in general terms; i.e. cold, moist, dry, etc.)? Temperature Moisture cA: VERY COLD dry cP: cold dry cT: warm dry mP: cold moist
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mT: warm moist 7. In the blanks below, list a likely location of the source region for each North American air mass. Be specific. Give an actual geographic location . Source Region cA: Canada cP: Northeast, Midwest USA cT: Southwest, New Mexico, Arizona, etc mP: Northwest, Washington, Oregon, etc. mT: Southwest, Southeast (Florida, California) 8. Which North American air mass ( cA, cP, cT, mP, mT ) is being described in each cell? cT Which air mass is only found over North America during the summer season? mP, mT Which two (2) air masses provide moisture to areas in the Eastern U.S.? cA Which air mass commonly forms over central Canada? mP Which air mass commonly affects the Northwestern and Northeastern coasts of North America? cA Which air mass is only found over North America during the winter season? mT Which air mass is most likely to form over the Gulf of Mexico? 9. How does an air mass going through stages of modification? Briefly describe the process. Use an actual air mass example if you find that to be easier. As air masses move, they can change their moisture and/or thermal properties Moisture and/or heat may be given to the surface Moisture and/or heat may be taken from the surface 10. Fronts are boundaries drawn on weather maps separating two different air masses. ( True / False ) 11. List the four (4) ways that a front can be identified on a weather map.
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1. Sharp changes in temperature 2. Changes in moisture content (dew point) 3. Shift in wind direction 4. Organized regions of cloud cover and precipitation Trough (area) of low pressure Sometimes can find a distinct cyclonic (CCW) bend in the isobars or height contours 12. Fill in the table below with the type of front ( cold, warm, occluded, stationary, dryline ) being described in each cell. Cold front This type of front has a very steep slope that helps intensify adiabatic cooling creating heavy precipitation Dryline front Winds shift from SE to SW with this type of front Occluded front This front is drawn purple on weather maps with triangles and semicircles Cold front This type of front generally moves from west to east Dryline This front is often associated with severe weather (i.e. severe thunderstorms and tornadoes) Warm front This front is drawn red on weather maps with semicircles Cold front After this type of front passes through an area, the atmosphere becomes cool and dry Cold front This type of front is created when a cold front overtakes a warm front Stationary front
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