Cirrostratus cloud is a high, thin, generally uniform stratiform genus-type, a rare phenomenon composed of ice-crystals. A moon halo often means that a rain is going to fall within the 24 hours.
Last Monday night, January 13, 2014, People from the Philippines were awed by the spectacle of the lunar halo.
A halo (from Greek ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by ice crystals creating colored or white arcs and spots in the sky. Many are near the sun or moon but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air.
There are many types of ice halos. They are produced by the ice crystals in cirrostratus clouds high (5–10 km, or 3–6 miles) in the upper troposphere. The particular shape and orientation of the crystals is responsible for the type of halo observed. Light is reflected andrefracted by the ice crystals and may split up into colors because of dispersion. The crystals behave like prisms and mirrors, refracting and reflecting sunlight between their faces, sending shafts of light in particular directions.
Atmospheric phenomena such as halos were used as part of weather lore as an empirical means of weather forecasting beforemeteorology was developed
Source: http://en.wikipedia.org/wiki/Cirrostratus_cloud
http://www.interaksyon.com/article/78620/spectacular-halo-around-the-moon-awes-pinoy-netizens
http://www.portaltotheuniverse.org/blogs/posts/view/302294/
http://en.wikipedia.org/wiki/Halo_(optical_phenomenon)
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