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  2. What are the rare ‘UFO clouds’ seen across the UK? - AOL

    www.aol.com/news/rare-ufo-clouds-seen-across...

    UFO-shaped cloud displays have appeared over the sky in a rare sight for parts of the UK. Several UFO sightings over northern skies in the UK have previously been explained by these cloud ...

  3. Rare sight of five funnel clouds captured on camera - AOL

    www.aol.com/rare-sight-five-funnel-clouds...

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  4. What are Kelvin-Helmholtz clouds? Rare formation spotted over ...

    www.aol.com/news/kelvin-helmholtz-clouds-rare...

    The rare and mesmerizing formation featured in Hunter's photo is actually known as a Kelvin-Helmholtz cloud, a name derived from Lord Kelvin and Hermann von Helmholtz, the two scientists who ...

  5. Morning Glory cloud - Wikipedia

    en.wikipedia.org/wiki/Morning_Glory_cloud

    The Morning Glory cloud is a rare meteorological phenomenon consisting of a low-level atmospheric solitary wave and associated cloud, occasionally observed in different locations around the world. The wave often occurs as an amplitude -ordered series of waves forming bands of roll clouds .

  6. Noctilucent cloud - Wikipedia

    en.wikipedia.org/wiki/Noctilucent_cloud

    Noctilucent clouds form mostly near the polar regions, [7] because the mesosphere is coldest there. [15] Clouds in the southern hemisphere are about 1 km (3,300 ft) higher than those in the northern hemisphere. [7] Ultraviolet radiation from the Sun breaks water molecules apart, reducing the amount of water available to form noctilucent clouds.

  7. Mackerel sky - Wikipedia

    en.wikipedia.org/wiki/Mackerel_sky

    A mackerel sky is a term for clouds made up of rows of cirrocumulus or altocumulus clouds displaying an undulating, rippling pattern similar in appearance to fish scales; [1] [2] this is caused by high altitude atmospheric waves. [3]

  8. What is a horseshoe cloud? - AOL

    www.aol.com/weather/horseshoe-cloud-205237171.html

    Clouds often captivate onlookers as they take on curious, billowing, or ominous shapes. One cloud that has been specifically named after an object is the horseshoe cloud, one of the rarest ...

  9. Rod (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Rod_(optical_phenomenon)

    A 2000 report by staff at "The Straight Dope" also explained rods as such phenomena, namely tricks of light which result from how (primarily video) images of flying insects are recorded and played back, adding that investigators have shown the rod-like bodies to be a result of motion blur, if the camera is shooting with relatively long exposure ...