re: Along with a strange streak
I've seen linear shadows on clouds that look like that when the sun is low, but the sun in this shot seems to be high and to the right.
I suspect that flare of light in the picture (see the bottom end of the streak) created some optical phenomenon in the camera. The flare or flame is not visible in either the before or after pictures.
In the picture, the flare at the lower end of the trail makes one think of a meteor about to hit the water, but one would think that this would have been noticed by the photographer if that had been the case.