Temperatures in the US have been running far below normal. Cold air holds less water than warm air.
So if you say “snow cover in 49 states is due to more moisture in the air from global warming” – then you have absolutely no idea WTF you are talking about. The air is not warm, and Sea Surface Temperatures are also running well below normal.
The widespread snow cover is due to cold, not the imaginary warmth inside your computer model.