Daily North American Snow Cover
Imagery of the MODIS snow-cover fraction (SCF), from the MODIS standard data product http://modis-snow-ice.gsfc.nasa.gov/ made by Land Atmosphere Near real time Capability for EOS (LANCE) is displayed to provide a view of North America snow cover in near-real time (NRT). The snow map is updated through the day as the MODIS orbit progresses westward. If you click on an area of interest it will be enlarged if the image was acquired within 7 days.
Near real time snow-cover maps can be used to view the extent of snow cover after storm clouds clear from a region, to assess when there are clear views of snow-covered land, and to determine overall snow-cover extent on the continent.
Caveat: false snow detection along cloud fringes is a commonly-observed situation associated with uncertain cloud detection or cloud-shadowed land.
LANCE http://lance.nasa.gov/ provides access to NRT data products from the MODIS (Terra and Aqua) and other EOS instruments in less than 3 hours from the observation time.