arihant current affairs magazine

arihant current affairs magazine

arihant current affairs magazine Published this article page no  11 They are violent storms that originate over oceans in tropical areas and move over to coastal areas bringing about large scale destruction caused by violent winds very heavy rainfall and storm surges. o They are low pressure weather systems in which winds equal or exceed speeds of 62kmph. o Winds circulate around in anticlockwise direction in the Northern Hemisphere and in clockwise direction in the Southern Hemisphere.  Tropical cyclones striking India generally originate in the eastern side of India. o Bay of Bengal is more prone to cyclone than Arabian Sea because it gets high sea surface temperature low vertical shear winds and has enough moisture in middle layers of its atmosphere. o The frequency of cyclones in this region is bimodal i.e. Cyclones occur in the months of May–June and October–November. Conditions for Cyclone Formation (Cyclogenesis)  A warm sea surface (temperature in excess of 26o –27o C) and associated warming extending up to a depth of 60m with abundant water vapour.  High relative humidity in the atmosphere up to a height of about 5000 metres.  Atmospheric instability that encourages the formation of cumulus clouds.  Low vertical wind between the lower and higher levels of the atmosphere that do not allow the heat generated and released by the clouds to get transported from the area.  The presence of cyclonic vorticity (rate of rotation of air) that initiates and favours rotation of the air cyclonically.  Location over the ocean at least 4–5 o latitude away from the equator. 52 Need for Cyclone Management in India arihant current affairs magazine buy.

arihant current affairs magazine