kerala rains

Weak South-West Monsoon making the South-Indian landmass dry up-

South-West Monsoon, which has been a prime weather pattern all over the India for rainfall has drastically reduce due to lack of Moisture influx and a proper mechanism to drive the monsoon. Kerala, which gets the major part of the monsoon of india, has dried up drastically due to poor rains in july and August. The rainfall reduced due to lack of low pressure systems originating from low latitudes and this made the major deficit of rainfall across south india.

There was a very deficit rainfall along the places of west coast and Gujarath, which majorly seeks the monsoonal rainfall anually.

Rain Pounds Tirupathi on 29th july 2016-
                          

The offshore trough-

                          

A trough which results in along the west coast due to the Thermal low along the Rajasthan is called an offshore trough. It lies around 25-50kms from coast and during night times, it settles inland and cause intense rainfall along the ghats of the south indian landmass. Western ghats crucial rainfall is based on the off-shore trough over the region. The off shore trough dips the westerly wind component and results in the formation of convergence along its periphery. 

                             

The area of convergence lies to the westerly portion of the trough and the area of divergence lies to the easterly portion of the trough if the wind comes along westerly. This pattern is seen along the off shore trough. The offshore trough will cause heating of land during the day and the relatively clouging effect along the coast during night.

Kerala Rains missing for long??

The kerala rains depends on the Mid-level systems arising in Bay of Bengal. If we see the systems, The periphery of the system lies such that the southern part dips the westerly winds to a maximum extent. Hence we see more rains along kerala.

The systems should form close to andhra coast and Mid-central Bay of bengal for better impact.