This might be a crabapple, though I’m not a crabapple expert. And the Malus or apple family, along with its fruit tree cousins such as the Pyrus or pear [ed: and I should add the Prunus family, which includes plums, peaches (which this might be), apricots, cherries, and almonds], are all five-petalled members of the large Rosaceae or rose family, making identification by flower alone quite tricky. At least, for me.
Whatever they are, they sure are pretty. Keep your eyes open for the wedding parade of fruit trees that soon will be marching through the city. It’s all too brief.
A bit of trivia: Why do they call these blossoms, not just flowers? A blossom describes a conspicuous flower that produces an edible fruit. Now you know.