Mortgage rates began the week right in line with their highest levels of the past 30 days.  This sounds a bit more dramatic than it is because the past 2.5 weeks have been very narrow and today's rates are merely at the upper edge of that range (i.e. not much different than the recent lows).

There were no meaningful economic reports driving volatility in the underlying bond market (bonds dictate rates), but overseas developments caused broad bond market weakness overnight.  Weaker bonds = higher rates, all else equal.

More extreme rate movement remains on hold until the government shutdown ends, thus allowing the publication of the big-ticket economic reports that have the biggest impacts on rates.