FWIW, I've made a particular study of this type of market. If you have access to historical prices, you can check out the behaviour of parabolic mkts for yourself. If you haven't, you can get such access at Time & Timing. Take the free 30-day trial; you'll be astonished at what you'll learn (and at how screwy the pundits commenting on commodity prices are).
Just by the by, I'll be writing an article for (probably) Active Trader magazine on exactly this topic, trading at the end of parabolic markets, perhaps in the next week or two. The next issue (May) of Option Trader magazine will contain (feature? I hope(g!)) an article of mine on non-seasonal trading which you might perhaps find of interest.
Good trading to you!
Thanks for the info. If you post your articles or links thereof here at FR, please ping me.