BOSTON (CBS) – There was a pretty cool sight in the sky today, a perfect ring around the sun!
Amazing ring around the sun 🌞 pic.twitter.com/66dOWlqkfp
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– Paula Ebben (@PaulaEbben), May 9, 2021
This weather phenomenon is not uncommon but cool to see and is known as a halo. It is caused by tall thin cirrus clouds about 20,000 feet in the sky. They can be very weak that it still looks mostly sunny! This type of cloud is made up of millions of very small ice crystals. When the sun shines through it at exactly the right angle, the light is split or refracted and reflected, creating a perfect 22-degree circle or halo. The same thin clouds can create a ring or halo around the moon at night. Most of the time, moon halos are colorless but can sometimes appear redder on the inside and bluer on the outside. Colors can be more clearly perceived in halos around the sun as we have seen it today.
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There is an old saying: ring around the moon means rain soon!
And sure enough … we have rain tonight!
Often times, cirrus clouds move in front of a storm system and can signal precipitation within 24 to 48 hours. Well, after a wonderful Sunday it will sometimes rain heavily overnight.
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The most even showers take off on early Monday with mostly cloudy skies and cooler temperatures.