As you may have noticed, the market has gotten somewhat, shall we say, wild. This broadening pattern (or megaphone) on the daily chart of the futures is the cause (click chart to enlarge):
This is considered a topping pattern, however these things can also turn out to behave like bull-flags.
In other words, be careful out there. The market appears to be winding up for a big move. One of those red lines will be tagged soon.
Note: the SPX has a similar pattern, but the one on the ES is better defined. The SPX isn’t open overnight, so it can only have a delayed reaction to events that occur when it is not open. So, I like using the ES chart better.