In the solar power industry, computer software is used in forecasting weather and sunlight patterns to assess the feasibility and cost of generating solar power in a particular area. (bls.gov)
Second, it has been point out many times a major difference in forecasting weather and forecasting climate. (realclimate.org)
For instance, that an inability to forecast weather for more than a few days implies that climate forecasts are impossible, is simply wrong. (realclimate.org)