Western disturbance are the monsoonal winds which arise from the Arabian sea west of India which brings rainfall to the Indian subcontinent.
Western disturbance are extratropical storm systems that form over the Mediterranean sea and travels towards east side towards Indian subcontinent .
The air they carry is full of moisture which comes from the Mediterranean sea which interacts with subtropical jet streams, influencing whether condition over vast region s, including parts of Pakistan , India , Nepal and Bangladesh.
The western disturbance mostly affects India mostly on winter season between November to March.
The rain they bring is very important for the north western regions including punjab, haryana and delhi.
It is essential for Rabi crop , which is down in winter season.
Name origin of Western Disturbance
They are named because of the movement pattern and the direction though which it is comming.
They origin from the western region of the Earth mostly from the Mediterranean sea.
The term disturbance is written because of the distruptive nature of the whether systems as they travel towards east because of the low pressure originated in the tibet region.
The high pressure in the Mediterranean sea flows towards the tibet which also brings precipitation along with it in the Indian subcontinent.
They may be called with other names on different areas of the world based on their characteristics.
The western disturbances has lots of merits and demerits in the Indian subcontinent.
It brings pre monsoonal rainfall to the different parts of India such as kerala, telangana, karnataka, madhya pradesh , Andhra Pradesh, Punjab, Haryana, Delhi.
It is very much essential for the Rabi crops which would have not been possible without them.
It brings rain on that region which recieves very less monsoon rain, because of which vegetation has been possible to these regions other wise these regions would have gone into extreme drought.
Because of the himalayas most of the winds reflex back and form rain in the Indian region.
Demerits of Western Disturbance
Western disturbance if they are affected by the streams and winds are in more speed they take away the rain along with it.
They bring extreme destruction in the areas when wind speed is high.
They also destroy some crops in extreme conditions.
They also bring extreme cold wave.
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