I'm doing some studying here and thoroughly reading the comments over here: https://cliffmass.blogspot.com/2018/06/was-there-unannounced-missile-launch-on.html
Along with other information that I've seen here on the chan and have come to a few conclusions.
The missile is on a horizontal trajectory at the time of this photograph. Consequently, the contrail behind the missile proper is wider than the rest of the contrail. It is also fairly high in the sky, I haven't found a resolution for the camera along with a location to compare the missile size to the camera resolution to get an accurate size on the missile.
Multiple comments on this blog testify to the fact that no one heard this missile. However, several comments mention the FLASH of the missile. That tells me that the missile was either launched from near Bangor or (most plausible) miles out to sea. One comment says that it was launched in transit from Bangor, but even that would have been heard and visible for miles around.
So that leaves the only logical explanation. The missile was launched far enough out to sea that it was not heard by anyone on land and in the photograph the missile was at least 10,000 to 20,000 feet high. A person who figured out the resolution of the image, the distance from the image, the angle of the camera, and the other relevant details would be able to prove that this was a nuclear missile launched from a Trident class submarine or that it was something else. Cam 4 is where the image came from, same general view of Cam 2 in the picture attached.
From what we know, the camera had a 20 second exposure. Trident missiles fly at 13,600 miles per hour. In a 20 second exposure, that would be 75 miles.
75 miles sounds like a lot, but lets see this: Assuming the horizon is very clear and no obstacles, and the jet plane cruises at 11,000m (37,000feet), from geometry results, the maximum distance at you can see it, until the plane drop below horizon, is around 374km or 230 miles
So, that makes the 20 second exposure very plausible and proves that this was a genuine missile. And, then, lets combine that with the fact that the missile contrail disappears behind cloud cover just a few "miles" behind… and all of this starts to make more sense.
I'm going to assume that this was an ICBM that was fired from a Ohio class submarine and was a TRIDENT. The range of that missile is 7,500 miles. So, within 30 minutes of this launch, was there ANY reports of noise anywhere along a path from Whidbey Island to Seattle and beyond? Hell, ANYWHERE over the CONUS was there a unexplained explosion within 30 minutes of the time of this photograph?
Remember, POTUS flew around the world the OTHER way to avoid this.