The folded-over EPO block links up with the building PNA ridge around 1/20-1/21 and the flow becomes extremely meridional, so I could definitely see there being support for a larger scale threat a day later or so. (1/22ish)
Obviously caveats apply as the look could change, but the reason the pattern has been pretty excited is because of how meridional it looks. That will keep the threats rolling in with a ton of cold over us.