Cyclone Asna - Daily Current Affairs for UPSC

Cyclone Asna has formed over the Kutch coast in Gujarat and adjoining areas of Pakistan, according to the India Meteorological Department (IMD).

It is the national meteorological service of India and the principal government agency in all matters relating to meteorology and allied subjects.
Headquartered in New Delhi.
The IMD was established in 1875.

A cyclone is a large system of winds that circulates around a center of low atmospheric pressure, moving in a counterclockwise direction north of the Equator and in a clockwise direction south of the Equator.
The term “Cyclone” comes from the Greek word “Cyclos,” meaning the coils of a snake, and was coined by Henry Peddington because tropical storms in the Bay of Bengal and the Arabian Sea resemble coiled serpents.
Cyclones are classified into two types: extra-tropical (or temperate) cyclones and tropical cyclones.

Also known as temperate cyclones, these occur in temperate zones and high-latitude regions, sometimes originating in the Polar Regions.
They have cold air at their center and derive energy from the interaction between cold and warm air masses.
These cyclones are always associated with one or more fronts, which are boundaries between different air masses—warm and cold.
They can occur over both land and ocean.

Develop between the Tropics of Capricorn and Cancer over tropical or subtropical waters, where they organize into surface wind circulation.
They develop only over seas.

Low Pressure Area: A low-pressure area must be present.
High Sea Temperatures: Sea temperatures need to be at least 27°C.
Converging Winds: Winds near the ocean surface must converge, forcing air to rise and form storm clouds.
Low Wind Shear: Winds should not vary greatly with height, allowing storm clouds to rise vertically.
Coriolis Force: The cyclone must be far enough from the equator for the Coriolis force to take effect.