The U.S. weekly average 30-year fixed mortgage rate rocketed up 10 basis points this week. Following a turbulent Monday, financial markets settled down with the 10-year Treasury yield resuming its upward march. Mortgage rates have followed. The 30-year fixed mortgage rate is up 33 basis points since the start of the year. Will higher rates break housing market momentum? It’s too early to tell for sure, but initial readings indicate housing markets are sustaining their momentum so far. The MBA reported that purchase applications are up 8 percent from a year ago in their latest Weekly Mortgage Applications Survey.