9. Moving Clouds
Of course, the sky is moving on a constant basis as the Earth spins around the sun. But usually, when you look up at the sky you see the clouds pointing in the same direction. However, there are times when you will see two separate layers of dark clouds moving in completely different directions.
This is an excellent signal that tells you that the atmosphere is unstable and bad weather is coming. The reason it does this is that it shows that the existing weather system is being pushed out by a new more unpleasant weather system.
