Suppose a maritime polar air mass moving eastward from the Pacific Ocean travels across the United States. Describe all of the modifications that could take place as this air mass moves eastward in winter. In summer.?
What will be the ideal response?
ANSWER: The mP air mass would dry considerably as it crosses the Rockies. In winter, on the eastern side of the Rockies, the air mass would probably be warmer than the air it replaces. The air mass would also become more stable as it moves over the cold ground. Precipitation would probably occur along the leading edge of the air mass, especially if Gulf air moves northward ahead of it. In summer, an mP air mass on the eastern side of the Rockies would probably be cooler than the air it replaces. Heating the surface would make it unstable in the lowest layers and cumulus clouds might form. Also, along the advancing edge of the air mass, showers and thunderstorms would form as warm, humid air is forced to rise.
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