In the season finale of season 9, Jackson runs into the burning bus to save a little girl, Evie. In the process though, he hurts his arm/elbow. Season 10 begins right where season 9 ends (meredith is still recovering from surgery and the power had just come back on), yet Jackson's arm is mysteriously recovered.
Owen says "time of death 15:56," which is 3:56 p.m. The entire story arc of the storm takes place in the overnight period, so the time shown on the clock and the military time he mentions should be a.m, "03:56."