Do leaves on a tree really indicate the coming of a storm?

I was often told that when all leaves on trees turned ’‘upside down’’, that this means a massive storm is up ahead.
Today we’re having really violent winds, I mean seriously…and most trees have their leaves like that. A storm is also announced…yet, the sky has been a bright blue and the Sun has been shining for hours. Where is this epic storm? What does it mean when leaves turn upside down like that?