Mortgage rates were technically steady today.  In fact, as of this writing, most lenders are offering slightly better terms compared to yesterday, but only by barely-detectable amounts.  The afternoon brought volatility in financial markets owing to trade-related headline.   That volatility isn't moving in a good direction for mortgage rates at the moment.  The takeaway is that, all other things being equal, lenders will be offering slightly weaker terms tomorrow morning, assuming they don't see quite enough weakness to adjust today's offerings with only a few hours left in the day.

Combine the volatility risk with the fact that rates are still very close to their lowest levels since last April, and this is still a compelling opportunity for potential homebuyers or owners interested in refinancing to lock a rate.  This doesn't mean lower rates are out of the question in 2019, simply that a few risk factors have stacked up without having done much damage to the long-term low rates from early January.  We need to see how markets react to those events (eventual end of the government shutdown, return of economic reports, progress on a trade deal) before getting a clear sense of longer-term lock/float risks.