In case you missed it, today is the day volume switched from the June contract to the September contract on the eMini. (ESM to ESU). Also the Federal Reserve has been meeting and will report at 2 PM Eastern Daylight Time today. Here is a look at the ESU6 contract up until noon EDT.
Remember in trading, it is not your job to figure out Why the market is doing what it is doing , but to trade what you see happening.