MAY 3, 2017
The accumulated rainfall forecast map for South Asia till May 20 shows growing rain clouds over southeastern Bay of Bengal and southern Arabian Sea. Kerala will receive upto 20 inches of precipitation in the coming fortnight.
The monsoon just does not mean that dark clouds appear from nowhere and it begins to rain. It involves the change of direction of wind high up in the atmosphere. About 12-13 kilometres up in the air.
Presently the jet stream is blowing over most of India coming from the west. In the coming days if we see the upper air wind forecast for say May 12, 2017, the westerly jet stream will be pushed up into Tibet by the monsoon winds blowing into India from the Arabian Sea and Bay of Bengal.
In the next ten days the winds in the upper atmosphere will change dramatically. A sure sign that monsoon is beginning to approach.
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