Bright flickering, lightning like flash, white/yellow glowing sparks, followed by three dull booms after 2-3 minutes

Walking east on the 1300 West block of Mountain Sky.  The major cross street near this area is 13th Avenue & Chandler Blvd.  Observed bright flickering from above.  Thought it was just a street lamp turning on. Flickering was very bright white-blue, like lightning.  Looked up, to see a streak of very bright sparks falling towards the South, at an angle of about 40 degrees.  These sparks were at first white, but then quickly dulled to orange.  Met a neighbor about two or three minutes later, who also saw the bright flash, and asked us if we had seen it.  We responded yes, then heard a series of at least three low booms, much like distant thunder.