Obviously, it's not a whole bunch of people sitting on the buy/sell @ market button when the report comes out, since huge moves can occur at exactly 10:30 ET. Something else is at work here, but nobody can really identify it that I have found on forums. It's like ZS...Sometimes at noon ET the thing shoots like a rocket long or short. I can only guess it's a "noon crop report" causing it.
There is only one entity who can possibly answer this question. The CME group. Ask them.