A huge wind storm knocked out power lines in a Montreal suburb, and at first the results included your garden-variety sparks and flashes.
Then relative normalcy took on a science-fiction edge Friday night as something transpired that you just don't see every day (maybe never). Check out what travels down a power line in the once-sleepy Lachine neighborhood in this raw YouTube clip (Warning: some off-color utterances ahead):
This was a high impedance electrical arcing fault. Usually the upstream protective device (ie. fuse, relay/breaker, recloser, etc.) will interrupt these types of faults and prevent them from continuing. They can start because of tree branches or animals or lightning strikes or anything that can bridge two phases or a phase and ground. The air becomes ionized and no longer acts as an insulator but a conductor. This arc is interesting because it was able to be sustained for such a long period of time.
Featured image via YouTube.