Long warm spells this winter unusual, says IMD

With the entire last week seeing the maximum temperatures hovering above 30 degrees, the Met department said this winter has seen a longer "warm spell" with maximum and minimum temperatures on the rise for over a week now.

While the earlier years witnessed warm spells for just two-three days, the maximum temperature has been continuing to hover around 30 degrees since the last week of November this year .

Medha Khole, deputy director general, India Meteorological Department (IMD), said the period of long warm spell "is not very usual".

"Usually warm spells last for just two-three days but this year the spell has lasted more than seven days where the maximum temperatures are constantly around 30 degrees and minimum above 10 degrees,'' said Khole.

Khole attributes the warm spells to the pronounced easterly waves which coupled with increased moisture and cloudiness causes a rise in temperatures. These features prevent the penetration of the northerlies or cold winds into central India, thus creating the warm spells.

With the presence of western disturbance, the Met department does not see the temperatures decreasing drastically in the next two days and said it would not dip below 10 degrees, though there could be a slight decrease in the maximum temperatures.

While November did see the temperatures going below 10 degrees, the Met department is yet to record a dip this month. Interestingly, the maximum temperatures have surged above 30 degrees only occasionally in the last few years. While the month's highest maximum temperature recorded last year was 32.6 degrees on December 2, it was 30.6 degrees in 2010 on December 24. At 31.5 degrees, the year 2009 recorded the month's highest temperature On December 6.

This year, as per the records of the Met department, since November 28 the maximum temperatures have been recorded above 30 degrees. Except December 3-4, where the maximum temperatures were at 28.9 degrees and 29.9 degrees respectively, the temperatures have been above 30 degrees in December.

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