Bonds are falling farther, faster. Weakness is being compounded by the Fed's updated buying amounts for news week. Treasuries were lowered to $15bln / day from $30bln. MBS were lowered to $8.9-10.7bln from $15.5/bln per day.
UMBS 2.5 coupons are now down 5 ticks (.16) on the day and more than a quarter point from the afternoon highs. 10yr yields are quickly up 3.3bps on the day to .65% (after being as low as .587% earlier).
Negative reprices are becoming likely.