It's composed entirely of ice crystals cascading from the upper reaches of the troposphere, and as these ice crystals fall, they pass through different layers with different winds and they speed up and slow down, giving the cloud these brush-stroked appearances, these brush-stroke forms known as fall streaks.
Se compone en su totalidad de cristales de hielo cayendo en cascada desde la parte superior de la troposfera. Conforme estos cristales de hielo caen, pasan a través de diferentes capas con diferentes vientos que los aceleran y frenan, dándole a la nube esta apariencia de cepillado, estas formas de pinceladas conocidas como mechones caídos.