Assuming the cold/confluence ejects East like the euro/gfs show we will have a long duration time frame with arctic sourced cold air, a damming high, and where it will be very difficult for a system to cut.
then it’s just a matter of getting a pacific system to eject within that 2-3 day window.
it’s a very wide goal post set up, about as good as you can get. Doesn’t mean it’ll pan out but you have to like the look( assuming the arctic airmass doesn’t dump out west like the Canadian shows).