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Fox News Weather Center

Chennai, India: End in Sight to Historic, Deadly Flooding

The persistent rains that caused widespread flooding and the death of more than 300 people since late October will finally depart southern India, including the city of Chennai.

Chennai experienced the wettest November in more than 20 years as more than 1,016 mm (40 inches) of rain fell.

That was followed up by the wettest December day in more than 100 years of record keeping as rainfall totaled 313 mm (12.33 inches) on Dec. 1.

High pressure shifting southeast into the western Bay of Bengal will force moisture from the Bay of Bengal southward into Sri Lanka from late this week into next week and usher drier air into southern India.

Locations from Nellore southward to Chennai and Nagapattinam will finally reach an end to the excessive rainfall as dry weather prevails from Friday into next week.

‘Worst Rain in 100 Years' Batters Chennai, India

This shift in the weather pattern will begin the dry season for southern India, ending the threat for any significant rainfall through next week and perhaps until the monsoon returns next year.

The only exception will be if a tropical cyclone is able to form in the Bay of Bengal during the second half of December. This could bring the threat for rainfall back to southern India briefly before a long stretch of dry weather to start the new year.

While dry weather returns to southern India, the shifting high pressure system will cause a surge of moisture from the Arabian Sea into western and central India.

The result of this moisture will be scattered showers and thunderstorms from Goa, southern Maharashtra and northern Karnataka into northern Andhra Pradesh, southern Chhattisgarh and Orissa.

While widespread flooding is not expected, localized amounts of 25-50 mm (1-2 inches) will be possible each day from the strongest thunderstorms.

This rain will be beneficial for most of the region following a below-normal monsoon season and recent dry weather.

These showers and thunderstorms will continue to develop daily and be scattered over similar areas through next week.