Winter Storm Warnings remain in effect for the entire Washington Area late tonight through Sunday afternoon.
Snow will develop Sunday morning between 3AM and 6AM becoming heavy between 6AM and 10AM before tapering off and ending between 12 Noon and 2PM. Snowfall rates may reach 2″ per hour Sunday morning with poor visibility and snow-covered roads. Conditions will rapidly improve during the early afternoon hours.
Latest North American Model (NAM, courtesy WxBell.com) shows the quick-hitting snow thump across our region:
Snow will develop from southwest to northeast during the pre-dawn hours early Sunday morning. Snow may fall heavily at times between 3AM and 11AM Sunday before tapering off and ending as flurries between 12 and 3PM.
Due to the overnight timing and heavier nature of the precipitation, this will be one of those wet snows that cover all untreated surfaces and will be great for making snowmen and snowballs.
In a rather rare turn of events, it appears that the Metropolitan Area has the best chance of remaining all Snow and receiving the heaviest accumulations. Sleet may mix in with the snow across southern Maryland and the northern neck of Virginia.
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).