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What’s in news?

  1. Autumn heatwave sweeps Australia’s east coast.
  2. Heat wave in Vidarbha likely, dust storm and thundershower in Madhya Pradesh to bring relief.
  3. Parts of India swelter under heatwave

Key Data’s:

  1. Heat wave in Australia:
  • An autumn heatwave will sweep several parts of the Australia this week with temperatures between 30-36 degree Celsius. Hot winds pushing over the east from central Australia are contributing to the unusual weather.
  • A monsoon trough was located near the northern Arnhem coast. A severe weather warning was issued by the Bureau of Meteorology.
  1. Heat wave in Nigeria:
  • The extreme heat has been in place since March and still in the grip of an intense heatwave. There is no relief in sight until the seasonal rains set in next month.
  • On Friday, the temperature touched 42.2C in Minna and the experts say climate change has become a public health risk.
  • When you have heatwaves, the body is dehydrated, the young, the elderly, people that live sedated lives – these are the kind of people that have immediate health reactions to the heat wave.
  1. Heat wave in India:
  • In some parts of Madhya Pradesh and Maharashtra, dry weather with clear sky conditions have been prevailing.
  • Due to clear sky, dry winds and direct insulation is resulting in heat wave like conditions over some places in Madhya Pradesh and Vidarbha region of Maharashtra.
  • The temperature crossed 43.6˚C.
  • The heat has mostly affected central and northwestern India, with cities across the states of Madhya Pradesh, Maharashtra and Rajasthan seeing daily highs of over 42C.
  • The heat is now beginning to also shift north into the states of Haryana and Uttar Pradesh. Warm winds from the south are blowing towards this region and helping to lock in the heat.
  • Thunderstorms and gusty winds between 30 and 40 kilometres per hour may also lead to a dust storm as a disturbance passing through will bring more moisture and instability to the area.

Heat wave:

  • A Heat Wave is a period of abnormally high temperatures, more than the normal maximum temperature that occurs during the summer season.
  • Heat Waves typically occur between March and June, and in some rare cases even extend till July. When actual maximum temperature remains 45*C or more irrespective of normal maximum temperature, heat waves should be declared
  • The extreme temperatures and resultant atmospheric conditions adversely affect people living in these regions as they cause physiological stress, sometimes resulting in death.

Why it occurs?

  • A heat wave occurs when a system of high atmospheric pressure moves into an area. In such a high-pressure system, air from upper levels of our atmosphere is pulled toward the ground, where it becomes compressed and increases in temperature.
  • This high concentration of pressure makes it difficult for other weather systems to move into the area, which is why a heat wave can last for several days or weeks
  • The longer the system stays in an area, the hotter the area becomes.


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