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Q118 (CDS-II/2012) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

Which one among the following statements regarding Chinook winds is not correct?

Result
Your answer: —  Â·  Correct: C
Explanation

Chinook winds are local, warm, and dry downslope winds that occur on the leeward (eastern) side of the Rocky Mountains in North America [1]. They are a type of foehn wind that forms when moist air ascends the windward side, loses its moisture through precipitation, and then descends the eastern slopes [2]. As the air descends, it undergoes adiabatic warming and compression, reaching the valley floor as a hot, desiccating wind [2]. Consequently, Chinooks do not bring rain; instead, they are known as 'snow-eaters' because they cause rapid sublimation and melting of snow [2]. These winds benefit agriculture and animal ranching by clearing grasslands of snow during winter, allowing livestock to graze [1]. However, their extreme dryness and high speeds can also lead to soil erosion and increased wildfire risks.

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Chinook (Snow Eaters) > p. 323
  2. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 14: Climate > Frihn Wind or Ghinook Wind > p. 142
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