Short-range stuff back to having a FRZA/-SN band come through during the Tuesday morning commute. Could be mostly impactful if people are out-and-about on Christmas Eve. It'll stick.
.SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/...
The low associated with the upper trough will be moving into the
eastern Great Lakes by Tuesday morning. Isentropic lift in a
moisture channel being drawn into this system may produce some
very light precipitation late Monday night into Tuesday morning.
Given the antecedent airmass, most areas should drop below
freezing Monday night even with slight warm advection aloft and
increasing clouds. Given the weak forcing, coverage of
precipitation remain somewhat uncertain, with the highest
chances along the Alleghenies and across northern Maryland east
of Catoctin Mountain. Potential onset timing also ranges before
and after sunrise. On top of this, there will be precipitation
type challenges since the warm advection aloft could push the
temperature profile above freezing. Even though QPF may only be
several hundredths of an inch, any amount of wintry
precipitation could pose a travel challenge given the cold
ground conditions.