what was that neon cyan blue flash?

this might be a dumb question, but when that crazy storm hit tonight, my friend and i were standing on the porch watching it roll in & we saw this absolutely insane bright blue flash light up the entire sky. did anyone else see that?? It was like nothing i've ever seen before, i've never seen a color like that.

i covered my ears right away expecting some sort of loud sound, but it never came. i was super confused bc i thought it must have been a transformer, but don't those usually make a lot of noise when they flash like that? anyways, stay safe everybody