DMPQ- Frontal Cyclones.

The systems developing in the mid and high latitude (35° latitude and 65° latitude in both hemispheres), beyond the tropics are called Frontal Cyclones or Wave Cyclones.According to polar front theory, the warm-humid air masses from the tropics meet the dry-cold air masses from the poles and thus a polar front is formed as a surface of discontinuity.

Such conditions occur over sub-tropical high, sub-polar low pressure belts and along the Tropopause.The cold air pushes the warm air upwards from underneath. Thus a void is created because of lessening of pressure. The surrounding air rushed in to occupy this void and coupled with the earth’s rotation, a cyclone is formed which advances with the westerlies (Jet Streams).The temperate cyclones occur mostly in winter, late autumn and spring. They are generally associated with rainstorms and cloudy weather.

During summer, all the paths of temperate cyclones shift northwards and there are only few temperate cyclone over sub-tropics and the warm temperate zone, although a high concentration of storms occurs over Bering Strait, USA and Russian Arctic and sub-Arctic zone.

 

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