Northeast Monsoon is the chief rainy season for South Peninsula. Seasonal rainfall from October to December for south peninsula is averaged at 334mm. Five meteorological sub divisions fall under the ambit of NE Monsoon, namely Tamil Nadu, Coastal Andhra Pradesh, Rayalaseema, South Interior Karnataka and Kerala.
In fact, the highest rains of the decade stands at 132.3 mm, seen in September 2014. The month of September for Bengaluru, it is the intermittent period of Southwest Monsoon withdrawal and Northeast Monsoon arrival.
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Northeast India, East India have completely remained dry during this period. Rain surplus between October 1 and Dec 15 stood at 48 percent. However, with almost no rains during this period, the season's surplus has reduced to 44 percent now after poor rainfall between Decemebr 16 and 22.
Heavy to very heavy rainfall is expected between 28thand 30thOctober. There are bright chances for this wet spell to extend in to opening days of November. The commencement of Northeast monsoon is invariably linked with intense rains for the capital city . Localized flooding, lightening, thunderstorm and gale winds is quite likely, with the monsoon making a loud and energetic start.