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Data assimilation system. . The observations are used to correct errors in the short forecast from the previous analysis time.Every 12 hours we assimilate 7 ? 9,000,000 observations to correct the 80,000,000 variables that define the model\'s virtual atmosphere.This is done by a careful 4-dimensional interpolation in space and time of the available observations; this operation takes as much computer power as the 10-day forecast..

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