The SNOW Tools API provides functions to access watershed level snow data for NWCC active forecast stations. There are three major snow data sources that are accessible from the API. They are NOHRSC's SNODAS SWE, NSIDC's INSTARR snow fraction, and University of Arizona's SWANN SWE. The specific snow data variables are:
SNODAS: swe and snow depth
INSTAR: albedo, radiative forcing, and snow fraction
SWANN: swe and snow depth
The API also provides sub-watershed level snow statistics based on elevation zones.