Upton waiting (as they should) to commit to anything for the late week system:
There remains a high degree of uncertainty for what may happen late
week, but the current thinking is that shortwave energy associated
with the cold front of the large cyclone over the Great Plains
shifts toward the East Coast on Wednesday night and into Thursday.
This may result in the redevelopment of a deepening surface cyclone
off the Mid-Atlantic coast by Thursday and into Friday. There
remains questions as to the degree of deepening, placement of the
low in relation to our area, surface temperatures, interactions with
the trough that remains to the east of the area, as well as the
timing of development. Additionally, there isn't much eastward
progression with the upper-level flow so the low may meander a bit
into the weekend. As a result, this remains a fairly uncertain
forecast with any specifics difficult to pinpoint at this time. For
now, capped PoPs at chance for much of the timeframe with a mix of
rain and snow possible for much of the area.