These types of cyclones are defined as large scale (synoptic) low pressure weather systems that occur in the middle latitudes of the Earth. A cyclone is unlikely to develop at ground level unless there is divergence above it. The main cause of the development is the formation of the front mainly occluded front. Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are low-pressure areas which, along with the anticyclones of high-pressure areas, drive the weather over much of the Earth.Extratropical cyclones are capable of producing anything from cloudiness and mild showers to heavy gales, thunderstorms, blizzards, and tornadoes. Initially, the front is stationary; with no encroachment by either of cold and warm masses. It will be expected to hit coastal Odisha by … … It is developed in mid and high latitude beyond the tropic means between 30 to 60-degree latitude in both hemispheres. Warm air moves northwards, and cold air moves southward, anticlockwise wise motion start around low-pressure areas, is called an extratropical cyclone. In this video we'll learn how the extratropical cyclones are formed. A typical mature mid-latitude cyclone or Temperate cyclones has a diameter of 1600 kilometers (1000 miles) or so. What kind of cyclone produces tropical depressions, tropical storms, and hurricanes? It is developed in mid and high latitude beyond the tropic means between 30 to 60-degree latitude in both hemispheres. They are not the same as tropical cyclonesor low … This video is highly rated by UPSC students and has been viewed 1 times. Climate - Climate - Extratropical cyclones: Of the two types of large-scale cyclones, extratropical cyclones are the most abundant and exert influence on the broadest scale; they affect the largest percentage of Earth’s surface. The main cause of the development is the formation of the front mainly occluded front. An extratropical cyclone is also called as a temperate cyclone. Hurricanes start out as tropical disturbances, grow to tropical depressions, tropical storms, and only become hurricanes when the winds reach at least 74mph and the sea surface level is at least 80 degrees. Origin and Development of Temperate Cyclones Polar Front Theory According to this theory, the warm-humid air masses from … Furthermore, this class of cyclones is the principal cause of day-to-day weather changes experienced in middle and high latitudes and thus is the focal point of much of … Mid-latitude or frontal cyclones are associated primarily with air mass convergence in regions between about 30° and 70° of latitude.  Thus, they are found almost entirely within the band of westerly winds. They include Earth's subtropical and temperate zones, which lie between the tropics and the polar circles. Such a condition is met only between 30 degree and 60-70 degree N and S (that’s why they are called temperate cyclones). 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