Cyclone commonly refers to the center of low air pressure, around which the air pressure gradually increases. Because of this the winds flow from all the directions towards the center.
Their shape is usually elliptical, circular or ‘V’ oriented.
Origin of temperate cyclone: Temperate cyclones originate mainly on polar fronts. But their origin can be anywhere outside the tropical zone. Their origin and development is more in the winter season. In the northern hemisphere, these cyclones range from the western coastal parts of the North Pacific Ocean to the Aleutian inland area and from the western shore of the North Atlantic Ocean to the lowlands in Iceland, besides this China, Philippines, Siberia are other major areas. In the southern hemisphere, these cyclones form in both summer and winter in a similar manner. Most cyclones occur around 60° south latitudes here.
Types of temperate cyclones:
These cyclones are divided into the following parts:
1. Thermal Cyclone: This type of cyclone develops from creation of a low pressure center on the continents due to excessive heat in the temperate regions. In these, the winds move from outside to the center. These are often permanent. These are often formed from low pressure centers over the ocean.
2. Dynamic Cyclone: The origin of the Cyclones is due to the support obtained from conjunction of fronts of cold polar and warm tropical oceanic air – masses. These cyclones affect wide areas.
3. Migrant Cyclone: These types of cyclones occur sometimes. These are the results of specific situations.