DMPQ- Write a short note on Extra Tropical Cyclone.

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Temperate cyclones are also known as Extra-tropical cyclone where the term “Extra-tropical” signifies that this type of cyclone generally occurs outside the tropics with a latitude range between 30° and 60°.

Characteristics of Temperate Cyclone (Extra-Tropical Cyclones)

  • The Extra-Tropical Cyclones are storm systems emerging in the mid and high latitudes, away from the tropics.
  • They are low-pressure systems with associated cold fronts, warm fronts, and occluded fronts.
  • These cyclones are formed along the polar front.
  • In the beginning, the front is stationary.
  • Extra-tropical cyclones are also known as mid-latitude storms or baroclinic storms.
  • In the Northern hemisphere, cold air blows from the north of the front and warm air blows from the south.
  • When the pressure descents along the front, the cold air move towards the south and the warm air moves northwards setting in motion an anticlockwise cyclonic circulation.
  • The cyclonic circulation results in a well-built extratropical cyclone, with a cold front and a warm front.
  • There are pockets of warm air compressed between the forward and the rear cold air.
  • The warm air climbs over the cold air and a series of clouds appear over the sky ahead of the warm front and cause rainfall.
  • The cold front approaches the warm air from behind and pushes the warm air up.
  • As an outcome, cumulus clouds develop along the cold front.
  • The cold front moves faster than the warm front eventually surpassing the warm front.
  • The warm air is entirely lifted up and the front is occluded and the cyclone dissipates.
  • They can originate over the land and sea and cover a larger area.

 

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