The Most Rare Atmospheric Phenomena on Earth

There is a long history of man looking up into the sky and seeing something so strange that the only option was to declare it extraterrestrial. Who knows how many stories these weather anomalies spawned? Green glowing lights dancing on the horizon, iridescent glowing night clouds, sparkling moon-rainbows and odd, colorful halos in the mist. Water and light and wind can playfully mix together all kinds of beautiful, magical creations.

Which of these rare atmospheric anomalies have you seen?

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    Thundersnow

    This unusual weather event is thermodynamically identical to a normal thunderstorm, but with snow instead of rain and the top of the thunderhead cloud low. As with a normal thunderstorm, hail may also fall. Thundersnow is often a part of a severe winter storm or blizzard with winds capable of being above tropical storm force. As a result, visibilities are frequently under 1⁄4 mile with extreme wind chills that can result in frostbite. There is also a greater likelihood that thundersnow lightning will have a positive polarity, which is associated with a greater destructive potential than the more common negatively-charged lightning.

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    Auroras

    Auroras
    Photo: United States Air Force photo by Senior Airman Joshua Strang / Wikimedia Commons / Public Domain

    "Aurora Borealis? At this time of year, at this time of day, in this part of the country, localized entirely within your kitchen?" - Superintendent Chalmers

    This atmospheric phenomena might be rare, but it's so spectacular that - unlike the rest of this list - everyone has heard of it. Also known as the Northern Lights or Southern Lights, this amazing light display is predominantly seen in the high-latitude regions of the Earth. These light shows occur when the magnetosphere is disturbed by solar wind. Charged particles in the form of electrons and protons change trajectory and precipitate into the upper atmosphere where their energy is lost.

    Auroras can be seen at lower altitudes as well, but present from further away, illuminating the poleward horizon as a greenish or reddish glow.

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    Fire Rainbow

    Fire Rainbow
    Photo: ProfessorX / Wikimedia Commons / CC-BY-SA 4.0

    The real name for this rare weather phenomenon is a circumhorizontal arc. These are caused by light passing through wispy, high-altitude cirrus clouds. They can occur only when the sun is very high - more than 58° above the horizon - in the sky and along the mid-latitudes in the summertime. In order for the conditions to be right, the hexagonal ice crystals that make up these cirrus clouds must be shaped like thick plates with their faces parallel to the ground. When light passes through, it refracts, or bends, in the same way that light passes through a prism. If all the crystals are lined up just right, the whole thing lights up like a rainbow.

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    Mammatus Clouds

    Mammatus Clouds
    Photo: Anton Yankovyi / Wikimedia Commons / CC-BY-SA 4.0

    This amazing cloud formation is particularly spectacular, but also usually means big storm activity. They will often come out of the base of a cumulonimbus - or thunderhead - cloud and are generally indicative of a dangerous storm. They appear as smooth, ragged or lumpy lobes and may even be somewhat translucent. They are usually composed of ice but can also be a mixture of  ice and water and in some cases entirely made of water. They are formed by cold air sinking down through the cloud above and cupped by rising convective warm air.  These clouds are usually the lumpy harbingers of very severe weather.