Last trading day of the month, likely to get some window dressing late in the day.
If the amazon earnings miss sparks some selling in the stock (which I don't really expect), then we may see the market dip a little deeper before a late day rally...
However, I do not see any major trouble here for the longs. I think the market will stay put today. If you're looking for volatility, most likely next week is the time for that.