I figured that my trading system would benefit if I can somehow figure out (before the trading session begins) if the upcoming trading session will be a higher than usual volatility day or lower. I'm not asking for a crystal ball method just some methodology to "guess" what today might bring in terms of movement in the markets. Direction is not important, just how much of a range I can expect to see over the day. I mostly trade bonds, and eurodollars, but if the S&P will move hard then I expect the bonds to move too. Everything pretty correlated nowadays anyways. The things I'm currently looking at to determine this is taking a look at all scheduled economic numbers that are due that day. Taking a look at major indices to see if we are likely to break new highs or lows, or whether today's action is contained within yesterday's daily bar. And any major news. Anyone recommend anything else? Maybe some websites that aggregate this type of data?