Q. Which of the following are favourable conditions for the occurrence of heat waves?
  1. Transportation of hot dry air over a region
  2. Absence of moisture in the lower atmosphere
  3. The sky should be practically cloudless
  4. Large amplitude cyclonic flow over the area
Select the correct answer using the codes given below:

Answer: Only 1 & 3
Notes: Heat waves favor conditions such as transportation of hot, dry air and a practically cloudless sky, which increase insulation. Absence of moisture in the lower, not upper, atmosphere favors heat waves. Large amplitude anti-cyclonic, not cyclonic, flow favors heat waves. Therefore, only statements 1 and 3 are correct.
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