Q. With reference to Heatwaves, consider the following statements:
1.A severe heatwave is declared if the departure from normal temperature is more than 6.4 degrees.
2.A lower wet bulb temperature means the air is moist and can hold less water vapor compares to higher wet bulb temperature.
Which of the statements given above is/are correct?

[A] .1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: A
Notes:

Statement 1 is correct: A heatwave is declared when the maximum temperature is over 40°C and at least 4.5 notches above normal. A severe heatwave is declared if the departure from normal temperature is more than 6.4 degrees, according to the IMD. Based on absolute recorded temperatures, a heatwave is declared when an area logs a maximum temperature of 45°C. A severe heatwave is declared if the maximum temperature crosses 47 degrees.

Statement 2 is incorrect: A lower wet bulb temperature means the air is drier and can hold more water vapor than it can at a higher wet bulb temperature.

Source: The Hindu