1) Rate hike has already been priced in. It should be no surprise since they have been talking about it for such a long time. So instead of "buy the rumor, sell the news", the market is in "sell the rumor and buy the news" environment.
2) Popular belief is that the market is going to drop if the Fed starts raising rate. (This doesn't line up with historical trend. Rising interest rate environment is bullish for stocks because it is indicative of strength not weakness.) This is actually good for the bulls because the market likes to do the opposite of what the masses think.
So if the Fed starts raising rate tomorrow, expect an initial drop lasting a few minutes after the announcement due to emotions, then a run up thereafter. Look for a short covering rally lasting about six weeks.
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