Do we know the focal length and shutter speed of the lens used for this pic? If so, then we could posit the weapon type and distance to the trail.

The trail covers a large fraction of the vertical field of view (angle of view comes from the lens focal length). We might deduce the field of view based on the known location of the camera and the distances to and between known objects on the ground.

The shutter speed of the camera gives us an idea of the time necessary to create the trail. We might get and approximation of that number from a normal range of camera ASAs and what we see from light levels at 3:56am. It would not surprise me if it was on the order of a minute.

The camera is aimed roughly NE. It seems to have zoom capability. In wide angle pictures there is a tree on the left of the field of view. The trail is to the right of the tree - direction ~NNE.

SkunkBayWeather posted a zoomed portion of the image. It does look like a missile with two engines. That is consistent with the first stage Trident missile. The missile does not have a vertical trajectory at or just beyond ignition, What looks like a missile has approximate dimension resembling a Trident. (Youtube has various Trident launch videos).

IF, in fact, it was a Trident, then this was a warning, since no nuclear detonations occurred. But there are missile components "out there" to be recovered.