Under the Effects of Heatwaves
GS Paper - 1 (Geography)
The eastern states of Jharkhand, West Bengal and Odisha have received a lot less rainfall than they usually do during the pre-monsoon season. With no rain spells to cool them down, these parts have been consistently sweltering under the summer heat. A heatwave has gripped the Vidarbha and Marathwada regions of Maharashtra.
What is a heatwave?
- A region is considered to be under the grip of a heatwave if the maximum temperature reaches at least 40 degrees Celsius or more in the plains and at least 30 degrees Celsius or more in hilly regions.
- When the maximum temperature departure ranges between 4.5 and 6 degrees, the India Meteorological Department (IMD) declares a heatwave.
- A severe heatwave is declared when the recorded maximum temperature of a locality departure from normal is over 6.4 degrees Celsius.
- Also, if an area records over 45 degrees and 47 degrees Celsius on any given day, then the IMD declares heatwave and severe heatwave conditions, respectively.
- The IMD has issued a ‘yellow’ alert, warning of continuing heatwave conditions over Chandrapur, Wardha, Nagpur, Amravati, Akola, Jalgaon, Buldhana, Yavatmal, Ahmednagar and Nashik districts till 30 April.
- A gradual rise in maximum temperatures by 2-3 degrees Celsius is very likely over most parts of the state this week.