The Global Forecast System (GFS) is a global numerical weather prediction computer model run by NOAA. The model is run in two parts: the first part has a higher resolution and goes out to 192 hours (8 days) in the future, the second part runs from 192 to 384 hours (16 days) at a lower resolution. The resolution of the model varies in each part of the model: horizontally, it divides the surface of the earth into 35 or 70 kilometre grid squares; vertically, it divides the atmosphere into 64 layers and temporally, it produces a forecast for every 3rd hour for the first 192 hours, after that they are produced for every 12th hour.
The Integrated Forecast System (IFS) is an operational global meteorological forecasting model. IFS is developed and maintained by the European Centre for Medium-Range Weather Forecasts (ECMWF) based in Reading, England
Information from the IFS is proprietary and copyrighted, though the ECMWF has made a limited amount of the model's most important calculations available to the public; this public data is, by declaration of the ECMWF, in the public domain. http://www.ecmwf.int/research/
The Global Environmental Multiscale Model (GEM) is an integrated forecasting and data assimilation system developed in the Recherche en Prévision Numérique (RPN), Meteorological Research Branch (MRB), and the Canadian Meteorological Centre (CMC).
Regional Atmospheric Soaring Prediction