The exact origin of this upload is unknown, as it was shared to the soundboard by a user without source details, but tornado warning sirens are a fixture of online culture. Siren sounds are a staple of memes, pranks and reaction videos, where any emergency tone can turn an ordinary clip into a crisis, and warning sirens like this one are often paired with dramatic build-ups. The classic rising-and-falling wail is instantly recognisable from civil defence systems in the United States, which is why it still works as shorthand for incoming disaster in edits and streams.