These high clouds are called Cirrus Radiatus and are made of ice crystals ... or come from a point on the distant horizon, the cloud bands are in fact running parallel to each other.

the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ice are usually more transparent. In some cases, you can see the Sun or Moon through them.

the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ice are usually more transparent. In some cases, you can see the sun or moon through them.