Mechanism of Western Cyclonic Disturbance and Tropical Cyclones in the Winter Season in Indian Subcontinent:
The western cyclonic disturbances which enter the Indian subcontinent from the west and the northwest during the winter months originate over the Mediterranean Sea and are brought into India by the westerly jet stream. An increase in the prevailing night temperature generally indicates an advance in the arrival of these cyclones disturbances. The frequency, intensity and coastal impact of cyclones vary from region to region. Interestingly, the frequency of tropical cyclones is the least in the north Indian Ocean regions of the Bay of Bengal and the Arabian Sea; they are also of moderate intensities.
Tropical cyclones originate over the Bay of Bengal and the Indian ocean. These tropical cyclones have very high wind velocity and heavy rainfall and hit the Tamil Nadu, Andhra Pradesh, and Orissa coast. Most of these cyclones are very destructive due to high wind velocity and torrential rain that accompanies it.
Although the western disturbances reason meager rainfall, even this small amount of precipitation is very helpful to the rabi crops, particularly wheat. The rainfall is in the form of light rains in the plains and deep snowfall in the western Himalayas; it is this