Quote from dmo:
I agree that if you wait for this to happen you'll miss most bottoms. But on those rare occasions when we approach major, major support (as we have on the ES at around the 1250 level), the relationship between the VIX cash and VIX futures is worth looking at.
I've gone back and taken a pretty close look at this, and when the VIX cash spikes way up into the 30's and especially 40's, it's a pretty reliable sign of a bottom. When this happens the futures do not follow the cash up there, and so at major ES bottoms, the VIX cash trades at a big premium to the VIX futures.
In this case the SPX traders represent the raw emotion, and the futures traders are the ones that keep their heads.
I have been trying to find a chart of the premium/discount of the VIX front-month futures vs. VIX cash, without success. If you know of any source for such a thing, I'd be grateful.