The Chinook wind acts as a warm blanket for the central plains of the USA during winter. When these winds descend the eastern side of the Rocky Mountains, they warm up through a process called adiabatic compression. This causes a dramatic and sudden rise in the local temperature, which provides much-needed relief from the freezing cold temperatures typical of the American winter. ANSWER: (D) The winter temperature increases
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The most famous effect of a Chinook wind is its ability to change the season in a single afternoon. In the winter, the central plains are often covered in deep snow and sub-zero air. When a Chinook arrives, the temperature can jump by 20 degrees Celsius in just a few hours. This happens because the air loses its moisture on the mountains and heats up as it is squeezed while descending to lower altitudes. This warming is vital for agriculture and livestock, as it melts the snow cover, allowing animals to graze on the grass hidden beneath.
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