This graph shows computer power and time versus model accuracy as defined by the S1 score (a measure of the skill of the forecast) of 36- and 72-hour NCEP 500-millibar forecasts.

High resolution available. (145KB, 887x724).

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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/foundations/numerical_wx_pred/S1Chart06.html