Here is an example. This is current day 10 prog vs day 15 valid for December 1. It’s not totally far off, but look how potent the trough is near AK and into GOAK. It’s a bit further east too. Yeah day 10 looks chilly, but that’s about to be booted out of here right after day 10. To me the current prog looks more realistic for that timeframe.
I do think it changes after first week.