When you visit a landscape and your time is limited, you have to make the best out of it if you like to come home with some decent photos. In Petrified Forest National Park I had clouds only for a short period of time and tried to incorporate them in my images. In addition they helped a little bit to mute the sun and lower the contrast, although in January the sun is still not really high. Without a polarizing filter the glare on the rocks and sand would overpower everything. Shooting at 16 mm focal length the use of a polarizer is a little tricky. It is easy to produce a totally uneven blue in the sky that is difficult to fix in post process, but without a polarizer… well, the glare just takes over. 😉