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WSA-Enlil is software to model the heliosphere for space weather prediction. The US National Oceanic and Atmospheric Administration (NOAA) runs it operationally using observational data, posting data and predictions online. WSA-Enlil is a combination of two models (or perhaps a combination of portions of two models): the WSA model developed in the 1980s-1990s to simulate the progression of the corona using observational data, integrated with the Enlil model, an MHD-based model to model solar wind outward from around 20-30 solar radii, using WSA output data. "WSA" is for Wang-Sheeley-Arge (three WSA developers) and "Enlil" is an ancient Mesopotamian god of weather.