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Optical Effects
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Nacreous clouds spotted over the western horizon an hour after sunset over Gullverket, Eidsvoll, Norway
Nacreous over Mesnali, Norway
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Nacreous over Lauvland, Norway
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Nacreous clouds are often lenticular wave clouds which are found downwind of mountain ranges that induce gravity waves in the stratosphere. These nacreous clouds were spotted by Gary's friend, Sierra Salin, in the early morning hours over Mt. Tamalpais, Marin County, California, US.
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Nacreous clouds spotted just before dawn over Oakland, California, US
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Nacreous clouds over Liverpool Bay, Ormskirk, Lancashire, England
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Nacreous clouds over Oslo.
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Nacreous clouds over Cholsey, south Oxfordshire, England.
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Nacreous clouds over Chester-le-Street, County Durham, England.
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Nacreous clouds over Turin, North Italy.
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Nacreous clouds over Sumirago, Varese, Italy.
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Nacreous clouds over Forfar, near Angus, Scotland.
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Nacreous clouds over North Wootton, Norfolk, England.
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Nacreous clouds over R.A.F. Leeming, England.
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A nacreous formation over Dean Court, Oxford, England.
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Nacreous clouds over Fraserburgh, Aberdeenshire, Scotland.
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