  In a single shot, we measure the full propagation path, including the
evolution to pulse collapse, of a high power femtosecond laser pulse
propagating in air. This technique enables single-shot examination of the
effect of parameters that fluctuate on a shot-to-shot basis, such as pulse
energy, pulse duration, and air turbulence-induced refractive index
perturbations. We find that even in lab air over relatively short propagation
distances, turbulence plays a significant role in determining the location of
pulse collapse.
