The humming noise from the arc is 60hz ac power. Shows the source was from an electro magnetic generator power plant. The path the arc is following is a 1200 or 4160 volt power line, the two wire high voltage feed to the powerpole step down transformers that you see every couple of hundred feet on the power poles.
The multiple flashes and cascade of sparks is one of those transformers biting the dust behind the gas station. The wind is real crazy high and randomly gusting blowing the wires into each other starting arcs that are the hopping up and down the street following the pole wires till the safety cut out. Note that most overloads on power lines allow 3 shorts till they trip for manual reset. This allows the lines to clear off a random tree branch.
They look like big balls of fire to the camera, however they are actually ribbons of arc a foot or less long. Just as bright as the suns surface though so it overloads the camera and the eye.
Incredibly dangerous to someone walking around under the wires in front of his house to take videos. A downed power line can look just like it is off and safe when all it has done is cooked off all the water out of the soil till it has a large diameter disk of high voltage soil. As animals put one foot into the circle it arcs them. So lineman slang is “the circle of death”, when you find a 10 foot circle of dead animals around a contact point for a power line that does not trip.
Never walk within 25 foot of a downed powerline, no matter how quiet it looks.
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Good info and advice. Hubby’s been a lineman for over 40 years.