We’ll enjoy a prolonged period of calm weather that should take us through the week of Christmas. Temperatures should warm from below average in the 30s to above average near 50°F by the start of next week. The above average temperature trend looks like it will extend through the week. No white Christmas this year. I’ll be taking some time off and won’t have another update until closer to the new year unless something significant shapes up.
Rest of today – clear conditions with high temperatures already peaking around the low-30s. Overnight lows in the low-20s with an Arctic air mass still hanging around.
Saturday – the high pressure responsible for the cold, but calm and sunny conditions progresses east and return flow should start taking hold, with winds veering south later in the day. High temperatures should be similar to today in the low-30s. Overnight lows will be warmer than tonight in the upper-20s with milder westerly downsloping flow.
Sunday – high temperatures continue to climb into the mid-40s as more southwesterly flow takes hold. Overnight lows likewise continue a warming trend to about the freezing mark.
GFS model output for 500 mb vorticity, wind and heights valid 6AM Tuesday, showing a flat, zonal flow set up 
Climate Prediction Center temperature outlook for December 25-29, calling for warmer than average temps over much of the Eastern US.
Monday – the warming continues with high temperatures forecast in the upper-40s to near 50°F. Overnight lows in the mid-30s.
Next week, it appears that we’ll be in a mostly zonal (flat westerly flow) regime at the upper-levels. That should help keep things calm and uneventful.