Wikipedia says that Sakura is the Japanese flowering cherry. Arthur Lee Jacobson in ‘Trees of Seattle’ says the Japanese call them Sato-zakura and that there are about twenty varieties common in Seattle. I don’t recall their changing colors, however, except to bloom and then quickly fade to green.
He says there are a number of them at the Arboretum, of course. But he pinpoints “Cascade Snow” used as street trees on 42nd SW south of Genesee St on the west side. Also 8 “Cheal’s Weeping Cherry” trees on SW Stevens St, west of Fairmount Ave SW, south side.