The winds upstairs are going to be at the upper end of what we usually see around here. RE: the NAM, I do not trust its depictions of CAPE or meso lows and such right now. It always looks scary severe weather-wise. I won't say there's zero tornado risk because we just don't know yet. At this point, what we do know is that there are some things look likely and some things look possible.
It looks likely that instability will be limited, due to an elevated warm layer and a largely overcast sky. It looks likely that there will be a lot of wind energy aloft that can be easily tapped. It looks likely that there will be a lot of rain, and the soil will be easily saturated. It looks likely that flooding will be a concern. It looks likely that even if winds remain below severe limits in most areas, downed trees would still be a concern, due to the aforementioned soil conditions.
It is possible that instability will be higher if breaks in the cloud cover occur (hard to tell at this lead). It is possible that a meso-low forms, backing the low level winds and increasing the tornado threat, at least for eastern areas. It is possible that convection earlier in the day reduces instability by the time the main forcing comes through, thus reducing the wind threat.
The main take-aways for me right now are that the potential is there for widespread wind damage reports, resulting from a squall line. There is not yet enough clarity or broad support to justify anything higher than an Enhanced Risk at this point, IMO. I certainly wouldn't be using the word "historic" yet. It is possible that things could change for the worse. But that is not the most likely scenario, based on the data available right now.