Mortgage rates hit the lowest levels in more than a month yesterday and came very close to the lowest levels in more than a year.  Things changed today, but only slightly.  Without a fresh supply of drama or weaker economic data, the bond market deteriorated.  Bonds typically benefit when investors are seeking safe havens in response to economic risks.  This pushes bond prices higher and yields (aka "rates") lower.  

Whereas there were concerns about Italian budget news and a weaker reading on Retail Sales yesterday, today brought stronger economic data across the board.  Bonds reacted by weakening (i.e. moving higher in yield/rate) and that was basically that.

If there's a saving grace for the bond/rate market is that the weakness found a limit fairly quickly and rates were only modestly higher.  In fact, if you don't count yesterday, we're still looking at the lowest rates since early April.