Hold the left mouse button down as you drag the slider above the image (or use the arrow buttons) to fade between the GOES-8 Sounder Snow Product and the corresponding GOES-8 Sounder visible channel image on 26 January 2000. The Snow Product helps to discriminate which of the brighter white regions on the visible channel are cloud cover and which are regions of significant snow cover.
This GOES Sounder experimental multispectral Snow Product is based on an algorithm developed by Shaima Nasiri (UW-Madison / CIMSS). It utilizes the longwave CO2 channels (for high cloud detection), the longwave and shortwave IR window channels (for low cloud detection) and the shortwave IR channels to determine snow cover. The Snow Product shown here is a composite of 3 consecutive GOES-8 Sounder images (17:46, 18:46, and 19:46 UTC) on 26 January 2000 (the day after the East Coast Winter Storm).