Tag Archives: clouds

Altocumulus Radiatus

Cloud of the Day – Altocumulus Radiatus Altocumulus radiatus is defined as clouds arranged in parallel lines that appear to converge at a central point near the horizon. Conversely, they could be said to appear to radiate from a central … Continue reading

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Pillar

Cloud of the Day – Pillar The pillar is an optical phenomenon where a light source, the Sun or the Moon or a streetlight, eg, is accompanied by a vertical column of light. Depending on the position of the light … Continue reading

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Sun Dogs

Cloud of the Day – Sun Dogs Many of the optical effects in meteorology, such as halos around the Sun and Moon, are the result of the way light interacts with ice crystals. Rainbows are a different matter. They’re the … Continue reading

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Asperatus

Cloud of the Day – Asperatus Asperatus, also known as undulatus asperatus and altocumulus undulatus asperatus, is biblical. It’s the kind of cloud that makes people think that the world might be at the mercy of supernatural forces. They might … Continue reading

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Fractus

Cloud of the Day – Fractus Fractus are subsidiary clouds, also referred to as accessory clouds. This means that they are associated with primary clouds such as cumulus or stratus. That’s why fractus clouds are always named in combination with … Continue reading

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Cap Cloud

Cloud of the Day – Cap Cloud Cap cloud (link to a super photo on the Astronomy Photo of the Day website) is similar to pileus in that it forms on top of another structure. In the case of pileus, … Continue reading

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Zodiacal Light

Cloud of the Day – Zodiacal Light Brian May played guitar for Queen. That’s Queen, not The Queen, although Queen might have played for The Queen. I don’t know. It seems unlikely, though. On the other hand, Brian May was … Continue reading

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Pileus

Cloud of the Day – Pileus A pileus cloud is one that forms on top of another cloud, forming a cap. The term pileus comes from the Latin for felt cap, of the sort worn in ancient Greece and Rome. … Continue reading

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Rainbow

Cloud of the Day – Rainbow There are many optical meteorological phenomena, and we’ve discussed a few, including aurora, halo and corona. Today’s example is the rainbow. Rainbow is a good name. It’s bow-shaped and it forms in rain. To … Continue reading

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Irisation

Cloud of the Day – Irisation A close relative of corona is irisation. Both are caused by interference among light waves diffracted by cloud particles. Since different wavelengths of light are scattered at different angles, they interfere with themselves at … Continue reading

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