Mortgage rates didn't move yesterday, despite a moderate amount of improvement in underlying bond markets.  When bonds improve, rates tend to move lower, but there can be a lag for a few reasons.  As we often discuss, bonds need to move by a certain amount during the day in order for lenders to go to trouble of changing their rate sheet offerings.  If there hasn't been enough market movement, the typical practice is to simply wait to adjust rate sheets on the following morning.

All too often, when lenders wait to make such adjustments, the bond market will bounce back toward weaker levels, thus leaving mortgage rates unchanged, even when markets suggest otherwise.  Other times, bond markets will continue moving in a friendly direction in the following day.  That's what happened today, and it allowed lenders to price in yesterday's market improvement as well as a portion of today's.
In the bigger picture, rates have been operating in a fairly narrow range for the past several weeks.  Upcoming events could nudge markets out of this range.  One of the best candidates for such an event is tomorrow's Fed Announcement.  To be clear, the Fed will not be making any changes to the Fed Funds Rate tomorrow, but they may take bigger steps to telegraph future policy changes than they have at previous announcements.  Investors will be looking for clues in the verbiage released at 2pm Eastern time.  As such, there's an increased risk of volatility in the afternoon.

ND's Daily Rate Survey
52 Week
30 Yr FRM4.58%4.61%-0.034.34%5.05%
15 Yr FRM4.14%4.17%-0.033.70%4.53%
FHA 30 Year Fixed4.18%4.20%-0.024.10%4.62%
Jumbo 30 Year Fixed4.37%4.39%-0.024.29%4.81%
5/1 Yr ARM4.37%4.40%-0.033.35%4.75%