Lee wave

Do you know how water in a river flows over rocks and creates little waves? It's like that, but with air instead of water. When air flows over a mountain range, it can create waves in the air. These waves are called "lee waves."

Now, remember when you blow up a balloon and then let it go without tying it? The air rushes out of the balloon and makes it fly all over the place, right? Well, when air rushes over a mountain range, it behaves in a similar way. It rushes up and over the mountain, creating a strong gust of wind that keeps going even after it has passed over the top of the mountain.

This creates a wave pattern in the air that's similar to the waves you see on the surface of water. The air gets pushed up and down, and the motion of the air creates pressure changes that can be felt by pilots and passengers on airplanes. These waves can travel for hundreds of miles and can even cause turbulence in the air.

So, when you hear about "lee waves," you're really just hearing about waves of air that are formed when wind passes over a mountain range. They're called "lee" waves because they're on the "lee" side of the mountain, which is the side that's sheltered from the wind.