Tropical Cyclones Current Affairs
The India Meteorological Department (IMD) issued advisory to Tamil Nadu, Kerala, Karnataka, Goa, Maharashtra and Lakshadweep archipelago (UT) over cyclonic storm ‘Sagar’. The cyclonic storm was developed as low pressure area in Arabian Sea which gained strength and intensified into depression and later into a cyclone ‘Sagar’. It is the first cyclonic storm of season to develop in Indian waters.
The cyclonic storm lay cantered over Gulf of Aden, about 390 km east-northeast of Yemen’s Aden city and 560 km west-northwest of Socotra Islands. It will made landfall in coastal Somalia. Gale winds speed reaching 70-80 kilometers per hour gusting to 90 kmph are very likely around system centre covering Gulf of Aden and adjoining areas of west central and southwest Arabian Sea for some time and gradually decrease thereafter.
A deep depression in Bay of Bengal has intensified into a tropical cyclone named Maarutha. This cyclone is expected to hit Myanmar on 17 April 2017 and bring heavy rains in parts of that country. Tropical Cyclone Maarutha is the first named storm of 2017 Northern Hemisphere tropical cyclone season.
About Tropical Cyclones
A Cyclone represents a rotating, organized system of clouds and thunderstorms that originates over tropical or subtropical waters and has closed low-level circulation. Most large scale cyclonic circulations are centered on areas of low atmospheric pressure. Based on their latitude, the cyclones may be tropical cyclones or temperate cyclones (extra-tropical cyclones).
The tropical cyclones rotate anti-clockwise in the northern hemisphere and are classified into three types viz. Tropical Depression maximum sustained winds of 38 mph or less); Tropical Storm (maximum sustained winds of 39 to 73 mph); hurricane (maximum sustained winds of 74 mph) and major hurricane (maximum sustained winds of 111 mph). Hurricanes are called typhoons in western North Pacific, while similar storms in the Indian Ocean and South Pacific Ocean are called cyclones.
Tropical Cyclones in Indian Ocean
Tropical cyclones between east of the Horn of Africa and west of the Malay Peninsula are most common from April to December, with peaks in May and November in the Indian Ocean. Vardah was the strongest cyclone of the 2016 North Indian Ocean cyclone season. The other cyclones in 2016 season included Cyclonic Storm Roanu, Cyclonic Storm Kyant and Cyclonic Storm Nada. Cyclone Maarutha is the first tropical cyclone of 2017 North Indian Ocean cyclone season. It started forming under the influence of a persistent area of convection in South Bay of Bengal on April 13, 2017 and has been recently classified as a Cyclonic storm. After giving heavy rainfall in Sri Lanka and Andaman & Nicobar Islands, it is expected to make a landfall in Myanmar in next two three days.