While this is a "scientific" forecast in the sense that it is made by a reputable computer model (NWS GFS), the models have had an unusually difficult time with the pattern change across North America that is trying to occur. One run will bring moderate to heavy snow, the next run nearly nothing. Thus, "wish casting" (as in, "I'm dreaming of a White Christmas...").
Anyway, Dr. Ryan Maue generated this graphic. The orange area in the central Plains is more than a foot of snow on the ground at that time!