The International Cloud Atlas has been added as a Link

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Welcome to the official site of the World Meteorological Organization’s (WMO) International Cloud Atlas. This Atlas describes the classification system for clouds and meteorological phenomena used by all WMO Members. The classifications also describe meteorological meteors other than clouds – hydrometeors, lithometeors, photometeors, and electrometeors.

The Atlas provides a common language to communicate cloud observations, and ensures consistency in reporting by observers around the world. It serves as a training tool for meteorologists, as well as for those working in aeronautical and maritime environments, and it has become popular with weather enthusiasts and cloud spotters.

© Albert de Nijs<br /> Lima NV, Sweden<br /> Latitude: 60° 56' 4'' N<br /> Longitude: 13° 21' 44'' E<br /> 22 December 2014 1634 (Local Time)<br /> Camera direction: towards W<br /> Image I.D.: P.10U.1<br /> Polar Stratospheric clouds : Nacreous<br /> Polar stratospheric clouds composed primarily of ice are known as nacreous, or mother-of-pearl clouds. After sunset they are characterised by brilliant iridescent colours as shown in this photograph from Sweden.<br /> Nacreous clouds only form in the stratosphere at a temperature below the ice frost point, typically near -85°C, in the high latitudes of both hemispheres during winter. They are often lenticular in shape.<br /> - See more at: https://www.wmocloudatlas.org/upper-atmospheric-clouds.html#sthash.GUc2O8N7.dpuf

© Albert de Nijs

Lima NV, Sweden

Latitude: 60° 56′ 4” N

Longitude: 13° 21′ 44” E

22 December 2014 1634 (Local Time)

Camera direction: towards W

Image I.D.: P.10U.1

Polar Stratospheric clouds : Nacreous

Polar stratospheric clouds composed primarily of ice are known as nacreous, or mother-of-pearl clouds. After sunset they are characterised by brilliant iridescent colours as shown in this photograph from Sweden.

Nacreous clouds only form in the stratosphere at a temperature below the ice frost point, typically near -85°C, in the high latitudes of both hemispheres during winter. They are often lenticular in shape.

– See more at: https://www.wmocloudatlas.org/upper-atmospheric-clouds.html#sthash.GUc2O8N7.dpuf

For more information please use the following link to the International Cloud Atlas.