Once you understand how certain clouds develop their shapes, you can learn to forecast ... the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ...

Once you understand how certain clouds develop their shapes, you can learn to forecast ... the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ...

the phenomenon occurs when sunlight interacts with ice crystals suspended in high-altitude cirrus clouds. These crystals, often hexagonal in shape, act like tiny prisms—bending, refracting ...