Still on track

It looks like arctic air that I've been promoting this week is still on track. Let's take a look at the model data. You can see a 'gateway' opening up here across the plains on the eastern slopes of the Rockies.

You can see the -18 line through Iowa by 12z (7am) Saturday morning.
You can see the coldest air is shifted over the Great Lakes region by early Sunday morning. So that means cold air advection through the day on Saturday and most of the day on Sunday. That's why I have consistently kept highs in the 30s. If we do see a high in the 40s it will be before sunrise on Saturday morning as temperatures will fall into the middle 30s by the afternoon.

Then round two on Tuesday as another -20 Celsius line moves into the Great Lakes. Look for some lake effect snow.