Spectacular images as Shelf Cloud hits Romanian seaside

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A Shelf Cloud has been captured in Mamaia resort on the Romanian Black Sea coast on Tuesday afternoon during a storm.

The cloud came along with a nowcasting alert for imminent severe weather (Code Red) issued by the National Meteorology Administration.

Furtuni Romania has announced the phenomenon also posting some photos capturing the famous cloud, highly appreciated by the storm hunters.

The Shelf Cloud is a type of arcus cloud that is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. Roll clouds and shelf clouds are the two main types of arcus. Arcus clouds most frequently form along the leading edge or “gust fronts” of thunderstorm outflows; some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Roll clouds may also arise in the absence of thunderstorms, forming along the shallow cold air currents of some sea breeze boundaries and cold fronts.

A shelf cloud is a low, horizontal, wedge-shaped arcus cloud. A shelf cloud is attached to the base of the parent cloud, which is usually a thunderstorm cumulonimbus, but could form on any type of convective clouds. Rising cloud motion can often be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn. Cool, sinking air from a storm cloud’s downdraft  spreads out across the land surface, with the leading edge called a gust front. This outflow cuts under warm air being drawn into the storm’s updraft. As the lower and cooler air lifts the warm moist air, its water condenses, creating a cloud which often rolls with the different winds above and below.

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