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Weather is a chaotic system, due to it being chaotic and the lorenz attractor maximum three days of weather can be forecasted.

"While we can typically predict general weather patterns up to 3 days ahead, predictability for detailed local weather such as rainfall or fog formation is much less."

see more here http://research.metoffice.gov.uk/research/nwp/ensemble/conce...

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If you think IBM may be unaware of the nature and consequences of chaos theory, you might want to look into Benoit Mandelbrot's employment history.

The thing is, is IBM as a corporate entity unaware of it? I know people who work for IBM who are much smarter than me, and who will always have a high level job as innovators in the IT industry, but they have 0 say in what IBM does, says or wants.

Unless your forecast is probabilistic.

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