Gradient Clouds
Uses core shaders to give the clouds a vertical transparency gradient, like how Minecraft: Story Mode depicts them!
The transition starts at the bottom when you're below the clouds, and it starts at the top when you're above them. There's a smooth transition between these two 'modes' when you pass through the cloud height.
The "Clouds" setting in video settings must be set to "Fancy" in order to see the change.