This is the most interesting Xmas Day AFD I have seen since 1989.....
"A lot of uncertaint has appeared in latest guidance regarding
later tonight through Christmas Day. While some models have only
limited low level moisture, other guidance like the latest few
NAM runs suggest low level flow off the ocean will bring
widespread low clouds into the region. The NAM even suggests
there could be some patchy drizzle or freezing drizzle.
Confidence on this is not yet high, but we will need to watch
this potential closely given the potential large ramifications
on the forecast. Without the low clouds, highs should rebound
well into the 40s on Christmas Day after lows in the 20s.
However, should the low clouds envelop the area, it is likely
temps would get stuck in the 30s on Christmas, resulting in a
considerably different flavor to the day. Again, confidence on
this is not high, but will need to watch trends closely through
today."