Halos are often the result of ice crystals in cirrus clouds. When moon or sunlight shines ... This allows us to see the halo effect that we don't ordinarily see with more common rainbows.

try a 'lunar halo'. These result from ice crystals in cirrus clouds that refract from the sunlight or moonlight. Refracting is the bending of light from one direction to another. Also read ...

When the edges of these clouds look especially crisp, it’s a sign that heavy rain or snow may be imminent. Wispy cirrus are ice clouds When cumulonimbus clouds grow high enough into the ...