Plains to suffer bone-chilling cold in coming days
The Medium-Range Ensemble Forecast members of the GFS indicate a frigid Canadian air mass will move into the Plains around September 15. Below is the GFS forecast.
Every forecast member shows a significant drop in temperatures coming in this week. The question is, where is this air mass now?
The circled region shows where the air mass is now. A sharp cold front will collapse into the country, with Canadian high pressure releasing frigid air as it drops down behind the front. Here's a projection of Thursday night's lows over the Plains.