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As warm, moist air rises up the windward side of a mountain, the air temperature cools and loses its capacity to hold moisture. Thus, the greatest amount of rainfall is expected at mid-altitudes and can support deciduous forest development. Above a certain elevation the rising air becomes too dry and cold, and thus discourages tree growth. [9]
Campers in mountainous areas may feel a warm afternoon quickly change into a cold night soon after the sun sets. During the day, the sun warms the air along the mountain slopes. This warm air rises up the mountain slopes, creating a valley breeze. At nightfall, the air along the mountain slopes cools.
Thus, hot air tends to rise and transfer heat upward. This is the process of convection. Convection comes to equilibrium when a parcel of air at a given altitude has the same density as its surroundings. Air is a poor conductor of heat, so a parcel of air will rise and fall without exchanging heat.
"The mountains act as a blocking mechanism causing the cold air to get trapped, only being able to move southward on the eastern side of the mountains." Cold air damming events can last for ...
[1] [2] As air rises from sea level to the upper regions of the atmosphere the temperature decreases. The effect of mountain topography on prevailing winds is to force warm air from the lower region into an upper zone where it expands in volume at the cost of a proportionate loss of heat , often accompanied by the precipitation of moisture in ...
Thursday's weather will feature an Arctic blast for the Midwest and Northeast and still more lake-effect snow for the Great Lakes. Cold air associated with a high-pressure area will move over the ...
Bitterly cold air will expand over the eastern two-thirds of the US over the next week. Blues and purples represent areas that will be much colder than normal while oranges and reds are warmer ...
Maine, Vermont, New Hampshire, and most of interior western Massachusetts have a humid continental climate (Dfb under the Köppen climate classification). In this region, the winters are long, cold, and heavy snow is common, courtesy of both coastal and continental low pressure systems. Most locations in this region receive between 60 and 120 ...