Summary – Right now, everything is on track for a major winter storm to effect the area starting late tomorrow morning. Snow will quickly become heavy and continue through the night and most of the day on Saturday. Snow should begin to wind down Saturday evening. Winds will also be an issue, gusting over 30 mph at times. I expect bands of heavy snow to set up over Central Maryland, where most places should have no problems getting to 18″, with isolated spots over 2 feet.
Here is my current forecast map:
There could be some mixing with sleet at times as the storm intensifies off the coast, this will be more likely well south and east of the Metro area.
There still could be some changes between now and tomorrow, but this is my thinking at this time.