Yep, natural gas.
Forecasts are all over the place. The question is, just now much of this air that's been gripping central Canada comes south. It has made it to northern Minnesota. I saw a -44 on the map, earlier, in the International Falls area.
The all time record low high here is -17, tied in 1996. I'm seeing -14 for Monday, after a -22 low. I'd have to think the lows will be lower, with a high that low. We'll see. Even the weather weenies are starting to compare this to 1996, now.