The NOAA National Operational Hydrologic Remote Sensing Center (NOHRSC) web site is http://www.nohrsc.noaa.gov/
NOHRSC also has an operation snow products search engine for locating NOHRSC data: http://www.nohrsc.noaa.gov/
The NOHRSC is a branch of the NOAA assigned to measure snow cover in the U.S. and Canada using satellite data, ground observations, airborne sensors and intensive ... hydrologic modeling. The WWW site features data from the annual snow cover CD-ROM, access via FTP, images, method explanations, and links to other servers. The home page also provides information on NOHRSC Snow Estimation and Updating System, Satellite Hydrology Program, and Airborne Snow Survey Program. The files at the NOHRSC FTP site generally follow the WWCYYJJJ.TTT format, where WW is the NOHRSC Window, YY is the year, JJJ is the Julian date, and TTT is the type of data, GIF image, SHEF file or ZIPped raster. The C is the code corresponding to images of areal extent of snow cover, snow water equivalent (SWE), percent of SWE, soil moisture, and snow depth. Other data include mean air temperature and degree days. The current NOHRSC products include the current seasons' snow cover images for the U.S. including Alaska, and Canada. The images correspond to particular regions of the U.S. and Canada. The operational snow mapping season begins in January and continues to May. The images are in GIF, SHEF and Raster format.
Other products include NOHRSC data for NWS River Forecast Centers: Arkansas-Red Basin RFC in Tulsa, OK; Alaska RFC in Anchorage, AK; Colorado Basin RFC in Salt Lake City, UT; California- Nevada RFC in Sacremento, CA; Lower Mississippi RFC in Slidell, LA; Mid-Atlantic RFC in State College, PA; Missouri Basin RFC in Pleasant Hill, MO; North Central RFC in Minneapolis, M; Northeast RFC in Taunton, MA; Northwest RFC in Portland, OR; Ohio Basin RFC in Wilmington, OH; Southeast RFC in Atlanta, GA; and West Gulf RFC in Ft. Worth, TX.