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Optical Effects
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A developing and expansive storm approaching Marina di Pisciotta, Italy
An imposing storm which Lisa spotted from her boat, near Åland Islands, Finland
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The development of what appears to be an arcus, also known as a shelf cloud, marking the leading edge of a storm system near Lam Plai Mat, Thailand
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The leading edge of a storm system near Paynesville, Minnesota, US
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A storm system with a leading arcus, otherwise known as a shelf cloud, near Brighton, Colorado, US
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A storm system near Rogerstown Estuary, Dublin, Ireland
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A storm system moving over farmland near Randolph, Iowa, US
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Arcus, also known as a shelf cloud, ushering in a storm near Montevideo, Uruguay
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An arcus formation within a dissipating storm system near Campbelltown, Central Victoria, Australia
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Arcus, also known as a shelf cloud, marks the leading edge of a storm system near The Entrance North, New South Wales, Australia
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A storm system with a well-developed arcus, also known as a shelf cloud, near Cotia, Sao Paolo, Brazil
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Arcus, also known as a shelf cloud, ushers in precipitation from a storm over New Brighton Beach, Christchurch, New Zealand
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A roll cloud, which is a form of an arcus cloud, spotted near the North West Shelf off of Western Australia
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An incoming storm system from what appears to be the leading edge of it, by way of this arcus (shelf cloud), which was spotted near the Franz Josef Glacier, South Island, New Zealand
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Arcus, also known as a Shelf Cloud, is a long, dark, horizontal roll or shelf running along the base of the storm cloud’s front edge, so it is the first cloud feature to arrive as the storm approaches an area. This storm system was spotted over Danforth, Ontario, Canada.
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Arcus, also known as a Shelf Cloud, ahead of a storm over Vakaloa, Tonga
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