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Post by wvengineer on Feb 19, 2013 0:50:49 GMT
Tonight, While I was taking the dog for a walk, I looked up and noticed a halo around the moon. A fairly large ring of light clouds was illuminated by the moon light. The ring was fairly large, maybe 20 degrees in diameter.
I didn't have a camera to try to take a picture, but I attached a file that my sister put together of pictures I took of one of these halos several years ago.
So what causes such a halo?
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Post by the light works on Feb 19, 2013 5:53:22 GMT
It has to do with suspended moisture and/or ice crystals in the atmosphere. for specifics, we'll have to have input from someone with more knowledge or willingness to do homework.
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Post by GTCGreg on Feb 19, 2013 6:12:27 GMT
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Post by watcher56 on Feb 19, 2013 18:22:07 GMT
Halo Around the Sun or Moon? Rain or Snow is Coming Soon!
Ice crystals in the upper atmosphere commonly associated with an approaching warm front.
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Post by c64 on Feb 20, 2013 13:28:15 GMT
In astronomy, this is known as an aureole or ring.
In the German language, this is known as "The moon has a court(yard)".
You can see this only in clear nights with little or no clouds at all.
When there are no clouds at night, the heat radiates into space and the temperatures drop significantly. And when the moon has his "courtyard", the weather will become cloudy, rainy and usually very windy soon.
The temperature drop at night caused by no clouds will make the next day extra cold and the rain clouds the next day prevent that the ground heats up from the sun. So the next day will be extra miserable, cold, wet and windy.
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