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A towering cumulus congestus that was on the precipice of developing into a cumulonimbus, as Heather related that thunderstorms came to fruition over Bannockburn, Victoria, Australia
Cumulus congestus, potentially developing into a cumulonimbus, captured by Nicola's son, Sam, near Adelaide, South Australia
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Crepuscular rays over New Taipei City, Taiwan
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Fluctus (Kelvin-Helmholtz) is a short-lived phenomenon that occurs when there is a strong vertical wind shear between two air streams, causing winds to blow faster at the upper level than at the lower levels. This example was spotted over Teddington, London, England.
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Cumulus over Minneapolis, Minnesota, US
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Horseshoe vortex, which forms in a region of rotating air, or vortex. This relatively rare and fleeting cloud formation appears for only a few minutes before evaporating. This horseshoe vortex was spotted over Rufford, West Lancashire, England.
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Fluctus (Kelvin-Helmholtz) spotted in the early morning over the Missouri River near Wolf Creek, Montana, US
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Virga over Greenfield, California, US
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Altocumulus lenticularis by way of a stacked form, also known as pile d'assiettes, spotted in multiple places over Mercogliano, Italy
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These lens-shaped orographic wave clouds, known as altocumulus lenticularis, form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. If there is enough moisture in the air, the rising motion of the wave will cause water vapour to condense, forming the unique appearance of lenticular clouds. This classic example was spotted near Narbonne, France.
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Crepuscular rays emanating brightly from behind cumulus clouds over Mendip Hills, Somerset, England
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A rare double horseshoe vortex spotted over Rio Rancho, New Mexico, US
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Virga descending from the remnants of a cumulus cloud, spotted over Lafayette, Colorado, US
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Waterspout near Pointe du Conguel, Quiberon, Brittany, France
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A curved contrail over Ningbo, China
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A classic example of Cumulus congestus over Georgetown, Texas, US
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