Right. Here's how to amaze your friends. First stand with the wind at your back. Then
you're looking for clouds. If those clouds are moving overhead directly away from you...
or directly towards you... or they're stationary then the weather is going to stay broadly
the same. If they're moving from left to right... it's going to get worse. If they're moving
from right to left... it's going to improve. So right to left, better, left to right worse.
Straight down the middle stays the same. As long as you have your back to the wind.
Unless you're in the Southern Hemisphere in which case you reverse that bit.
It's brilliant isn't it?