Cyclone is an intense vortex or a whirl in the atmosphere with very strong winds circulating around it in anti-clockwise direction in the Northern Hemisphere and in clockwise direction in the Southern Hemisphere.  For Ex- Cyclone Titli

Some of the special characteristics of tropical cyclones are as follows:

• Cyclones have intense low pressure areas and pressure increases outwards.
  
  
• They mainly originate mainly in zones between 5– 30 °C Norther & South of latitude.
  
  
• These originate over oceans in tropical areas & move to coastal areas.
  
  
• They have large destructive force caused by violent winds, heavy rainfall & storm surges.
  
  
• Tropical cyclones follow a parabolic path and its axis is parallel to the isobars.
  
  

Some of the necessary condition for the formation of tropical cyclones are as follows:

• Continuous supply of abundant warm and moist air.
  
  
• Sea temperature in lower latitudes should be around 27°C.
  
  
• The cyclones require presence of large Coriolis force to deflect winds blowing toward the low pressure centre.
  
  
• There must also be pre-existence of weak tropical disturbances.
  
  
• Further, there should be presence of anticyclonic circulation at the height of 9 to 15 km above the surface.
  
  

However, the tropical cyclones are different from temperate cyclones in following ways:

• Tropical cyclone is confined between 5-30° N-S of the equator, whereas temperate cyclone originate between 30 to 60° N-S of the equator.
  
  
• Coriolis force plays vital role in the origin of tropical cyclone, whereas for temperate cyclone frontogenesis is the driving force.
  
  
• Temperate cyclone covers large area as compared to tropical cyclone.
  
  
• Tropical cyclone generally originates over water surface but the temperate cyclone originates over mid-latitude land mass.
  
  
• Temperate cyclone generally moves eastward, while tropical cyclone moves from east to west.
  
  
• Cyclone’s eye is a typical feature in case of tropical cyclone, while temperate cyclone have no such concept.
  
  

Thus, as cyclones carries destructive force there is a need for timely dissemination of warning and increasing preparedness of disaster management authorities.