According to these charts:

If that is the case, one of the questions in my mind is whether the fall will be hard and fast or the reverse.

Chimes with Fully’s Copper H&S from earlier.

Unsurprisingly given its heavy $WTIC weighting, $CRB looks similarly bearish IMHO:

 

As an aside, and this if this turns out to be correct, I don’t think it will happen in a vacuum. Most things will sell off hard.