The European Centre for Medium-Range Weather Forecasts (ECMWF) is an independent intergovernmental organization that operates one of the largest supercomputer complexes in Europe.  Below is the model's prediction of different types of precipitation in South Dakota for the next 10 days.  Use the scroll bar to check out the forecast maps or click on the animate button to view see maps in a slide show.   Map Updates: Every 12 Hours (00z and 12z).