At this season the south east of Asia in under influence of severe thunderstorm resulting from Inter-Tropical Convergence Zone.It is said that the pilot asked for deviation from their regular path to avoid thunderstorms.
The Inter-tropical Convergence Zone, or ITCZ (pronounce itch), is the region that circles the Earth, near the equator, where the trade winds of the Northern and Southern Hemispheres come together.In Asia, countries such as Malaysia, Singapore, Indonesia and Philippine located in this area.The intense sun and warm water of the equator heats the air in the ITCZ, raising its humidity and making it buoyant. Aided by the convergence of the trade winds, the buoyant air rises. As the air rises it expands and cools, releasing the accumulated moisture in an almost perpetual series of thunderstorms.
ITCZ moves to southern hemisphere from September to march. Now it is somewhere around 7 degree south of equator. As a result wind moves from north east to south west and brings lots of moist from Pacific ocean which collides with winds from southern hemisphere. The result is up warding air and severe shower in short period of time.
The solid bands of clouds may extends for thousands of kilometers and sometimes is broken to smaller segments.
Therefore, up warding hot, moist winds and down warding cold air which delivering a significant amount of water may be responsible for a natural and human disaster.
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