On January 13, a combination of snow cover and broken clouds over the southern Appalachian region made it difficult to distinguish where the clouds were located using visible satellite alone.
Here is the 1 km MODIS visible image. It’s very difficult to tell what is cloud cover and what is snow cover:
Compare this to the 1 km MODIS False Color Composite image at the same time. The clouds (white) are easily distinguished from the snow cover (red):
Using the 1 km MODIS False Color Composite imagery made the answer much more clear, and added short-term confidence to WFO Morristown’s 18Z TAF ceiling forecasts.