So, holy crap. The area about an hour North of my house got pounded by some significant tornadoes yesterday. One funnel was reported to be about a mile wide. Probably the same one (not sure, though) could end up rated as an EF 3 on the Enhanced Fujita scale -- one about 2% of the tornadoes in the world are that strong, with winds in the 136–165 mph range.
It seems Weld County is just far enough to be a bit of a tornado factory, though usually they are just small ones that do next to no damage out int he farmlands. This was a definite exception to the norm.