The SPoRT program is providing the Night-time Microphysics RGB product from VIIRS and MODIS using the EUMETSAT receipe of channels/differences. A unique webpage has been created for part of the southeast U.S. to allow products related to fog and low clouds to exist in one place regardless of instrument source:
Here is an example from a VIIRS pass this morning. Can you see areas of fog without looking at a surface obs plot first? Can you differentiate fog from low clouds?
Post comments with your guess of where the fog actually is and check back for the answer in a future post.