Question map
Which one among the following statements regarding Chinook winds is not correct?
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] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Chinook (Snow Eaters) > p. 323
- [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 14: Climate > Frihn Wind or Ghinook Wind > p. 142