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...To define the initial conditions, we need observations and we don't have observations for large parts of the globe.Mainly, we have 2/3rd (of the Earth as) oceans, we have mountains, we have deserts, we have poor countries which are not able to operate or manage observation systems...In the process we have some amount of error.Often we are asked as to why in tropics the predictions are not as accurate as they are in extra-tropical regions.It is primarily because the intrinsic property in tropics is that weather is driven more by energy forces and, therefore, it can fall all of a sudden, it could be very intense in a limited period of time, it could move in any direction.In an extra-tropical region, the weather is very stable.Once it forms, it will last for a week and it is always uni-directional, west to east, and it is over a huge spatial domain...In tropics the predictability in summer is five days and in winter seven days. ...Indian Express on Nov. 17, 2013, 3:40 a.m.
...Apart from the fact that hedging requires expertise, it is also expensive and the advantage of the dollar loan is gone if companies cover their exposure to the greenback.For state-owned firms, though, it's a different dilemma altogether.Public sector companies, especially those in the petroleum sector that need to make purchases of oil in dollars and are therefore particularly vulnerable, have a large portion of foreign currency exposure unhedged. ...Indian Express on Aug. 7, 2013, 1:44 a.m.