From twitter we have some excellent photos of a contrail that, via perspective foreshortening, appears to be flying near vertical, and then making a rather sharp turn.
A bit of investigation (in the thread below) narrows this down to a private jet flying at 41,000 feet. The contrail looks somewhat vertical because it is flying towards the camera, but it's actually horizontal.
It looks like a regular contrail coming over the horizon towards the viewer, and then making a turn. While it looks almost like a 90° turn, it's more like 10° due to perspective foreshortening.
Time is given as "around 8:20", PST, so UTC-7. so 03:20 UTC tomorrow July 1st. It appears to be approaching from the West.
A bit of investigation (in the thread below) narrows this down to a private jet flying at 41,000 feet. The contrail looks somewhat vertical because it is flying towards the camera, but it's actually horizontal.
It looks like a regular contrail coming over the horizon towards the viewer, and then making a turn. While it looks almost like a 90° turn, it's more like 10° due to perspective foreshortening.
Time is given as "around 8:20", PST, so UTC-7. so 03:20 UTC tomorrow July 1st. It appears to be approaching from the West.
Last edited: