![]() ![]() One of the main causes of the Morning Glory cloud is the mesoscale circulation associated with sea breezes that develop over the Cape York Peninsula and the Gulf of Carpentaria. One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia, which can occur up to four out of ten days in October. They are a solitary wave called a soliton, which is a wave that has a single crest and moves without changing speed or shape. Roll clouds usually appear to be "rolling" about a horizontal axis. They differ from shelf clouds by being completely detached from other cloud features. Ī roll cloud ( Cloud Atlas name volutus) is a low, horizontal, tube-shaped, and relatively rare type of arcus cloud. An extreme example of this phenomenon looks almost like a tornado and is known as a gustnado. ![]() A very low shelf cloud accompanied by these signs is the best indicator that a potentially violent wind squall is approaching. In a severe case there will be vortices along the edge, with twisting masses of scud that may reach to the ground or be accompanied by rising dust. Shelf clouds usually appear on the leading edge of a storm, while wall clouds are usually at the rear of the storm.Ī sharp, strong gust front will cause the lowest part of the leading edge of a shelf cloud to be ragged and lined with rising fractus clouds. This is likely to be a mistake, since an approaching shelf cloud appears to form a wall made of cloud. People seeing a shelf cloud may believe they have seen a wall cloud. 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 ( wind shear). This outflow cuts under warm air being drawn into the storm's updraft. Cool, sinking air from a storm cloud's downdraft spreads out across the land surface, with the leading edge called a gust front. Rising cloud motion can often be seen in the leading (outer) part of the shelf cloud, while the underside can often appear as turbulent and wind-torn. 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. 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.Ī shelf cloud is a low, horizontal, wedge-shaped arcus cloud. They most frequently form along the leading edge or gust fronts of thunderstorms some of the most dramatic arcus formations mark the gust fronts of derecho-producing convective systems. Roll clouds and shelf clouds are the two main types of arcus clouds. Analysis of how the museums use the cloud, alternative solutions, and what museums should be asking before using the cloud, such as legal restrictions and types of digital assets being stored, will provide some insight and help museums decide if the cloud is a plausible option.An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. This paper describes whether and how several museums have decided for or against cloud services (Wisconsin Veterans Museum, Philadelphia Museum of Art, Minnesota Historical Society, Harvard University, and the Walters Museum of Art in Baltimore, Maryland). By understanding what a museum needs for digital preservation of their digital assets it will allow the museum to determine if the cloud would be appropriate for theirĭigital collection. This paper examines a few cloud service providers (Amazon, Shared Shelf, Preservica, and ResourceSpace) along with other forms of storage on-site (NAS, SAN, and DAS) that are available. ![]() Should museums be utilizing cloud storage for their digital assets? There are severalĭeployment models (public, private, community, hybrid) and service models (software, platform, infrastructure, and backup) all of which have their own advantages and disadvantages for museums. ![]()
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