The appearance of a rainbow glowing through fluffy clouds sighted on Tuesday over Hoekwil on the Garden Route has been confirmed as an iridescent cloud.
The SA Weather Service, confirming the pictures show an iridescent cloud, said on Wednesday iridescent clouds are quite often encountered at higher latitudes.
“Such clouds are, in meteorological terms, referred to as cirrus or cirrostratus clouds. The public would be very familiar with the common phenomenon of rainbows, when falling rain, drizzle or sometimes fog is ‘backlit’ by bright sunshine. The rainy region acts as a giant prism, splitting up the light into its component colours according to wavelengths,” he said.
“The result is that particular section of cloud will appear to shine or glow in rainbow colours,” Rae said.“Iridescent clouds are encountered quite often at higher latitudes. It is a common phenomenon in the northern hemisphere, where many countries are positioned at higher latitudes, and in the southern ocean regions of the southern hemisphere.Rae said another meteorological phenomenon related to iridescent clouds is the “halo” phenomenon.
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