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Optical Effects
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A contrail that appears to be coming out of the building's chimney, spotted over Twillingate, Newfoundland, Canada
A late afternoon volutus (roll cloud) over the Kapiti Coast, North of Wellington, New Zealand
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Cirrus spissatus, which is a thick cirrus cloud, is often accompanied by other species of cirrus clouds within close proximation. These clouds can be formed by a conglomerate of cirrus clouds at high altitudes, and separate from that origin, they can also form from the remnants of a dissipating thunderstorm that once had a fibrous top. This example of cirrus spissatus was spotted over Thumrait, Southern Oman, near the Yemeni border.
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Arcus, also known as a Shelf Cloud, ahead of a storm over Vakaloa, Tonga
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Anti-crepuscular rays over Rarotonga, the largest of the Cook Islands, a nation of 15 islands in the central South Pacific.
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Stratocumulus and stratus clouds coming together for a low cloud base over Vancouver, British Columbia, Canada
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Cumulus congestus developing into a cumulonimbus over Semporna on the island of Borneo, Sabah State, Malaysia
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Villarica volcano has active vents, one of which created this unique volcanic vortex ring, also known as a 'smoke' or 'vapour' ring, while simultaneously in the distance there were altocumulus lenticularis forming. Bob spotted these developments while climbing Villarica volcano in Chile.
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Altocumulus in both its stratiformis and lenticularis forms, along with undulatus and cumulus fractus in this mixed sky over Neibla, near Valdivia, Chile.
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A developing cumulonimbus with precipitation reaching the ground by way of what appears to be a potential microburst, which is a localized column of air (downdraft) within a thunderstorm. This evolving storm was spotted near South Canterbury, New Zealand.
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A variety of remnants from contrails, including one that is spreading out due to strong upper level winds. Homogenitus, which is a cloud that forms as a result of human activity, is reflected here via the prior contrails. This colorful scene was spotted over Wilmington, North Carolina, US.
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Altocumulus lenticularis along with some dissipating 'sister' clouds over Patagonia, Argentina
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There is some question as to whether or not this cloud would be viewed as a "Banner" cloud, amidst the overcast skies over Tindholmur Island, Vagar, Faroe Islands
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An elliptical shaped cloud formation that appears to be Cumulus fractus via a dissipating cumulus cloud, joined together in this unique manner, spotted over Tierra del Fuego, Argentina
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Fog is sometimes described as a ground-level Stratus cloud, since that’s the lowest of the main clouds. However, it often forms quite differently. In this photograph, it appears that this is valley fog for the most part, which is a variation of "radiation fog" after a cool and clear night, wherein the cold, foggy air sinks downhill and gathers further below. This classic example was spotted over Pauatahanui Inlet, north of Wellington, New Zealand.
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Cumulus fractus prior to sunset over Gondal, Gujarat, India
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