Sky trumpets or the Trumpets of the imminent apocalypse.

Sky trumpets or the Trumpets of the imminent apocalypse.
These three videos of strange sounds from the sky were captured in January 2016 around the world.

The strange sky trumpets were recorded in Singapore, Budapest and California. What's going on?

Strange sounds heard in Singapore at night on January 13, 2016


Strange sound from the sky on January 9, 2016, in Budapest, Hungary


Strange noises from the sky in Bakersville, California on January 8, 2016


These sounds are all different. And this makes me think they are legit. But of course you decide. And why are they increasing these days along with loud booms?