Yes! I was driving with my kids down I-35, and my daughter excitedly said, "It's full on, all the way!" Driving with kids can be dangerous because they make me laugh.

We saw it just before we saw you at Carmody Paul. Coincidence or ... not?

I got a nice pic near Schroeder, but since you make it so difficult to upload.

Is it just me, or does it appear that the aliens are getting ready to take over our city?

I'm no meteorologist, but I believe the key is to look at the cloud bases of the surrounding clouds, which I believe are either cumulous or altocumulous (probably way off).  Anyway, I don't think this is a Cumulonimbus incus, because they grow from the cloud base up, and this one appears to be growing from the cloud base down (although I can't see how tall this one is).  I'm just assuming, because traditional thunderheads of that type do not commonly occur over Lake Superior on October 28.  My theory is that it is a type of mammatus cloud (the ones that form the lumpy cloud bottoms during severe thunderstorms).  My guess is that a cumulous cloud got too big for its britches, and once the convective forces keeping it aloft over the land no longer existed, the bottom literally dropped out, and a new cloud bottom was created using the new combination of atmospheric pressure, temperature and humidity existing over the lake.