This animation compares data taken by several geostationary weather satellites, including the Geostationary Operational Environmental Satellites (GOES), and the Goddard Earth Observing System Model, Version 5 (GEOS-5). GEOS-5 is an assimilation model that starts from observations taken by satellites such as GOES and then builds a forecast for some days into the future. The period of time shown here is during February 2010 which brought record snowfall to the east coast of the United States.