http://www.vce.com/grable.html
http://www.vce.com/grable.html
In many pictures and films of atomic tests there are a series of vertical smoke trails to one side of the blast. These are identified in one of the frames on the page you posted. I assume that these trails are not caused by the blast, but serve some sort of testing function, perhaps to measure some parameters of the shock wave. Anyone know for sure?