Looks like the way things are shaping up with most of the precip, at least for BWI Marshall where it’s spotty and light, we have to wait until about afternoon to get into the shield of precipitation as moistening in the warm advection zone continues.
Thinking remains largely unchanged that it can be frozen (sleet mainly, or snow) at times in BWI before the mid levels warm enough to change everything over to rain late Saturday afternoon and evening as the new low starts to take shape on the Delmarva.
The precipitation can be heavy for a time, but then it will be rain for anyplace south and east of BWI and a quick change to rain farther to the northeast. The tough zone, as usually, will be in Carroll and Frederick Counties where there can be some freezing rain after the snow and more along the lines of 1-3 inches of snow Saturday with things getting going quicker up there and slower mid level warming.
The rain should end in BWI about midnight, then as northwest flow takes over, there will be some clearing toward morning. There will be a gusty northwest breeze behind the departing storm Sunday with some sunshine. It should be cold again Sunday night and Monday.