• Orographic Middle and High Cloud
    This cloud often forms east of New Zealand’s main mountain ranges as a result
    of an increasing northwest flow ahead of a frontal system. At first, single Ac
    lentics form, but as the front approaches, upper level moisture increases and an
    ‘arch cloud’ develops. This arch cloud usually displays a very sharp western edge.
    Flying conditions within the arch are usually smooth; however, conditions will be
    very turbulent below the cloud at low levels. Moderate or severe icing may be
    encountered within the arch depending on its thickness.
    with respect to Peter Fisher

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