This afternoon while walking down Capitol Hill I watched a jet draw a long white vapor trail starting in the sky above me down to the north. It wasn’t dissipating. The tail end was spreading a bit and the wind was blowing it into a curved shape. Later at the waterfront I tried to work out where the remnants of the vapor trail I’d watched had gone. There was the long rope of cloud near the west horizon; but there was also the wispy mass crowding the daytime moon in the south and now being bisected by another jet that left only a temporary disappearing vapor trail. The wind was giving mixed signals. I could feel it blowing lightly against me toward the east; but the vapor trails were moving to the southwest.