Het artikel is heel duidelijk:
,,An arcus cloud is a low, horizontal cloud formation associated with the leading edge of thunderstorm outflow, or occasionally with a cold front even in the absence of thunderstorms. Roll clouds and shelf clouds are the two types of arcus clouds, slight variations in their generation and look being the difference.''
Aan de laatste zin moet nog wel worden toegevoegd dat er ook een wezenlijk fysisch verschil tussen shelf cloud en rolwolk is, maar dat terzijde.
Over shelfs:
,,A shelf cloud is a low, horizontal wedge-shaped arcus cloud. Unlike a roll cloud, a shelf cloud is attached to the base of the parent cloud (usually a thunderstorm). Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn.''
Gr. Ben
,,An arcus cloud is a low, horizontal cloud formation associated with the leading edge of thunderstorm outflow, or occasionally with a cold front even in the absence of thunderstorms. Roll clouds and shelf clouds are the two types of arcus clouds, slight variations in their generation and look being the difference.''
Aan de laatste zin moet nog wel worden toegevoegd dat er ook een wezenlijk fysisch verschil tussen shelf cloud en rolwolk is, maar dat terzijde.
Over shelfs:
,,A shelf cloud is a low, horizontal wedge-shaped arcus cloud. Unlike a roll cloud, a shelf cloud is attached to the base of the parent cloud (usually a thunderstorm). Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn.''
Gr. Ben
