Friday March 10 – The snow this morning was already showing up in Pennsylvania at 5 AM while light rain is developing in central Maryland. Temperatures were still rather mild (mid 40s) ahead of the front and the lag of colder air will mean that heavy snow will fall from colder clouds, but fall on warm ground and with temps just above freezing for a while. The makes it difficult to determine where the stickage will be. It’s one thing to get it on the grass and measure it, but the roads are really the concern. Heavy snow can cover roads with slush even when the air is still above freezing… if it is heavy enough. Also, visibility will be lowered with big flakes.
“If it doesn’t snow by you, it doesn’t mean it didn’t happen” – You can quote me on that. There may be three to 4 four of snow from Westminster to York PA this morning, while Towson may only have an hour or two. Meanwhile Baltimore and south may only get a brief band of snow around lunchtime.
Here’s the timeline to transition… it looks rain this morning will change over in a few hours. The snow line will stay north of Annapolis and the heaviest may be between 9 and 11 AM. At that point, traffic is lower and the higher sun angle should help limit stiackge on the roads. The freezing line will stay up in northern Maryland and southern PA where there may be a brief period of snow snow covered roads. Below is a look at the Tuesday Coastal storm.
Radar Simulation —> slider HRRR Model
York get snow between 7 and 8 AM. Westminster by 9 AM. But Towson and north Baltimore might not see the change until 11 AM