Wrote this away.
Meaningful changes will begin to occur by day 15.
Ridging is going up through AK , the EPO goes negative and the WPO remains negative so it just feeds Arctic air off the Asian continent into Canada.
Take that 3 days from here ( 500 posted ) and I believe the trough is back in the east.
So when that trough does come east will be filled with stable cold Arctic air.
I like closing up W Canada and if the day 15 500 mb look is feedback over the Rockies then the ridge in the east will be already weaker by day 15.
Feb 5 ish is still my call.