I think the NAM's last 3 runs have proven that additional WSWatches need to be extended east and south. In addition to a heavy snow threat is an increasing risk of freezing rain and sleet. All precipitation types are highly dependent on temperature profiles at the surface as well as the 925mb, 850mb, and 700mb levels. Warmer air will be drawn into the system, producing warmer readings above while colder air exists at the surface for a time. Sleet could mix in at times if the shallow warm air can be offset by the colder air beneath it before reaching the surface.
If any other precipitation types are realized for an extended period of time, this will adversely affect snow totals. This will be an efficient QPF producer. For all snow, expect up to a foot. for others, expect some type of mix for a time. Dynamic cooling in association with the low can be expected as well. This will produce intense snowfall rates, especially on the backside of the low. It's still hard to tell where all of this will set up.
Stay tuned as this complicated storm structure develops...
MS
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