Quite literally the airmass that normally sits over the North Pole. Consistency for the timeframe over the last couple runs of data has been impeccable for being out towards day 6. Everyone is playing it a bit conservative at the moment to account for model error and changes but certainly holds credence to a major burst of arctic air.
If it holds somewhat close to what's being depicted... it would be the coldest air seen since at least Feb 1996 for my area (SE MN) but I'm sure it'd be close for central Iowa too.
View attachment 61952
Shown above is modeled air temperature (colors) in
Celsius a few thousand feet up in the atmosphere.
I have -25° for my Wednesday morning low in SE MN. Coldest I've seen in my 11 years up here was -26°... but if the above scenario were to hold we'd be talking about temps well into the -30s with a wind chill in the -60s for my area. Could it? Yes, but still too much time to change in the data to be that ballsy just yet. What can you pick up from this? Taking it all in, you can count on a very cold airmass... but specifically how cold it could be is still a bit uncertain.