When viewing snow falling, appears white. But soon as it intersects with water as a background it turns to a shade of blue. I highly doubt this is intented as snow particles die when hitting water surfaces as it should. So snow falling above the waterline would have no reason for a color change. This happens for both static water and moving water. Even if the snowfall passing in front of ice, soon as it intersects with the blocks of water under the ice, it changes the tint.