Snow will develop across the Washington Region during the morning hours on Sunday continuing through the late afternoon with a widespread 3 to 5″ of accumulation expected.
Snow may mix with Sleet during the evening hours and then potentially taper off to Freezing Drizzle during the overnight hours.
A glaze of ice from freezing rain is expected for locations east of interstate 81 and south of interstate 70.
On Monday a secondary storm will deepen off of the Del-Mar-Va coast line and slowly move northeast allowing for any Sleet and or Freezing Rain to change back to Snow.
The Snow will likely pick up in intensity on Monday afternoon through the evening with low visibility and treacherous travel conditions. Snow will taper off to flurries on Tuesday morning before ending around noon. This will be a major winter storm with widespread travel disruptions.
The latest forecast models continue to show some differences in how far north the wintry mix makes it on Sunday evening, and how far south the wrap-around heavy snow falls on Monday afternoon through Monday night. My snow map took the middle ground (a blend of the GFS and European models).