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News
El Nino is weaker than anticipated, says IMD
Date:
07 Jun 2017
Source:
The Hindu
Reporter:
Jacob Koshy
News ID:
12578
Pdf:
Nlink:
The India Meteorological Department’s optimism about more rainfall is largely premised on hopes that a strong El Nino, which, as per its earlier forecast, was expected to surface in the later half of the monsoon, would now be much weaker than anticipated. “A weakened El Nino is largely why we expect better rains,” said Madhavan Rajeevan, Secretary, Earth Sciences Ministry.
In April, the IMD had said there was a 38% chance of near normal rains (96% of the LPA). Now the models showed a 50% chance.
The El Nino — characterised by surface waters of the equatorial Pacific warming up by more than half a degree — is known to dry up monsoon rain every six out of 10 years. A positive Indian Ocean Dipole (IOD) is said to buffer the impact of El Nino and contribute to better rains. (The IOD is a swing in surface temperatures that turns the western Indian Ocean alternately warmer and then colder than the eastern part of the ocean.)
New model
In April, the IMD shifted to using a new monsoon forecast system, called a dynamical model that works by supercomputers simulating the weather and extrapolating it.
It plans to make this as the base for all future forecasts, ranging from short-term weekly forecasts to the trajectory of the four-month- long monsoon. However, for its June update, the IMD chose to rely on its workhorse statistical model that forecasts the monsoon based on six meteorological parameters.
The dynamical model, according to the IMD statement, showed monsoon rains to be 89 cm or 100% of the LPA. “In April, both models showed the same. It’s good for computing the all-India figure but not yet good at capturing the regional spread,” said Mr. Rajeevan. “In the next few years, we hope to move entirely into the dynamical mode.”
Private weather forecaster Skymet said it was sticking to its “below normal” forecast at 95% (with an error margin of +/-5%) of the LPA. Rainfall for July stood at 94%, while for August it was 93% of the historical average.
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