DISCUSSION: As of this evening, a low-pressure system (and its strong cold front to be exact) has quickly been approaching the Hudson Valley of New York State. As it continued traveling to the south and east with time, the attendant cold front is dragging along with it a much colder air mass than has been in place over the past several days. This is due to the fact that the oscillation of the variable Arctic low (i.e., the statistical position of the more dominant collection of low-pressure systems residing in the vicinity of the Arctic Circle) has allowed colder air to descend from northern and central Canada. Thus, this next round of cold air will be ushered in by this latest incoming and now developing extra-tropical cyclone. You can also denote the position of the colder air in both the image and the animated satellite imagery attached above via the darker blue-colored region over northern Michigan and southern/southeastern Canada.
Thus, this colder air rushing into both interior and coastal sections of the Northeastern United States is facilitating the occurrence of a brief (but in some cases) heavy burst of wet snow. Hence, many roads such as (but certainly not limited to) Interstate 81 North/South as well as the New York Thruway will quickly become incredibly hazardous to drive on both tonight and throughout the day tomorrow. This is also due in part to the fact that surface and near-surface air temperatures will be quickly falling well-below the freezing mark tonight. Thus, any untreated roads and surfaces will quickly and effectively become complete "ice rinks." Therefore, if you need to travel tonight and/or tomorrow, be sure to leave extra time when heading out since the roads will still make for a slow go of it come the morning rush across many parts of the coastal and semi-interior Northeast.
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© 2018 Meteorologist Jordan Rabinowitz