What are the Equatorial westerlies

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It's a name given to the westerly winds of the low latitudes,caused when the north-east & south-east trade winds are deflected on the crossing the equator & develop a westerly component thereby becoming the equatorial westerlies whenever the inter-tropical convergence zone is more than 5 degree away from the equator.
          The shifting of the position is related to the shifting of pressure belts 5(degree)N/S to 10(degree)N/S as per the movement of the sun & the amount of insolation received.When the sun is overhead the tropic of cancer,differential heating leads to a low pressure region over the north-west India,Arabia etc. which provokes ascending warm air causing lower air convergence thus, inviting the south-east trades( which are constant & carry moisture due to their path of motion over the seas/oceans) to cross the equator & get deflected to the right as per Ferrel's Law & Corriolis Force  & enters the Indian sub-continent as south-west monsoon winds & bring rainfall & floods (if there is precipitation excess).the surface convergence is due to the upper air divergence which brings rainfall over the sub-continent.Equatorial westerlies help upper air divergence(scavenging) of ascending air(warm).In summer they blow from east while they blow from the west during the winter resulting in upper air convergence over the sub-continent resulting in surface air divergence (off-shore).

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