Two things that may confuse folks visiting the site for the first time. The direction of the arrows and the colours.

We had two options for the direction: Direction the wind is blowing, or direction the wind is coming from .. we chose the first because to us it made more sense.

A wind vane only points into the wind because that physically is the only way it will work, but in the computer world we're not hindered by that.

If you check the maps (maybe you already have) you'll see the map makes plenty of sense to show which way the wind is going .. a Westerly wind blows across the map from west towards the east, so the arrow points towards the right.

Swell charts and many other meteorological readings all show arrows in the direction that something is going .. i.e. it would look strange to draw an arrow of where waves were "coming from" .. It's only wind that sometimes has the "lets point the arrow at where it came from" concept, and that's because (we think) of wind vanes.

Hope that helps understand the reasoning behind it all!