Why does the website have these awesome colours?

The website changes color automatically.
The color of the site indicates how hard the wind blows, and how hard it will blow.
The left side is how hard it is currently blowing.
The right side indicates how hard it will blow soon
The same color order is used as with wind guru.
Blue: No wind
Green: Enough wind
Red: More than enough wind
The darker the redder/purple: Absurdly windy