Tropical storms
- August 23, 2020
- Posted by: OptimizeIAS Team
- Category: DPN Topics
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Subject: Geography
Context:
Two newly formed tropical storms Laura and Marco could become almost simultaneous threats to the US Gulf Coast early next week
Concept:
- Tropical cyclones are violent storms that originate over oceans in tropical areas and move over to the coastal areas bringing about large scale destruction due to violent winds, very heavy rainfall and storm surge.
- They are irregular wind movements involving closed circulation of air around a low pressure center. This closed air circulation is a result of rapid upward movement of hot air which is subjected to Coriolis force.
- Conditions Favourable for Tropical Cyclone Formation
- Large sea surface with temperature higher than 27°C
- Presence of the Coriolis force enough to create a cyclonic vortex
- Small variations in the vertical wind speed
- A pre-existing weak low-pressure area or low-level-cyclonic circulation
- Upper divergence above the sea level system
- Favorite Grounds for Tropical Cyclones
- South-east Caribbean region where they are called hurricanes.
- Philippines islands, eastern China and Japan where they are called typhoons.
- Bay of Bengal and Arabian Sea where they are called cyclones.
- Around south-east African coast and Madagascar-Mauritius islands.
- North-west Australia.