Roger Nusbaum submits: Bob Pisani actually said something I agree with.
Sometimes the market is on treacherous footing and it just goes lower. There doesn't have to be a clear and obvious reason for the action -- specifically today.
I have been in the camp, after the initial hit two weeks ago, that volatility is back and we should probably expect more downward action.
A normal correction -- and we still have a ways to go for that -- seems like it has a high probability. But no greater probability, IMO, than it had last week.