A spectacular and rare sight dazzles guests at a resort in Jamacia with a huge rainbow hovering in the clouds.
Beckie Bone Dunning, from Belleville, Illinois, captured the rare sight on camera while visiting Ocho Rios in Jamaica.
She posted it on The Weather Channel’s Facebook page in search of finding out what it was.
She said: ‘I was in Ocho Rios, Jamaica last week. Storm clouds were approaching.. didn’t quite cover the sun yet.. I looked up and saw this.. never seen it before in my life. Can you explain it?’
She added: ‘I didn’t have a clue what it was. I pointed up and said “oh my God look, at the sun”.
‘Then the guests at the resort all started looking and snapping pictures.’
The rare phenomenon is called cloud iridescence, it is a rare sight as conditions must be exactly perfect.
Cloud iridescence is the occurrence of colors in a cloud similar to those seen in oil films on puddles, and is similar to irisation. It is a fairly uncommon phenomenon, most often observed in altocumulus, cirrocumulus, lenticular clouds and cirrus clouds. The colors are usually pastel, but can be very vivid. Iridescence is generally produced near the sun, with the sun’s glare masking it, so it is more easily seen by hiding the sun behind a tree or building. Other aids are dark glasses, or observing the sky reflected in a convex mirror or in a pool of water.
Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light. Larger ice crystals produce halos.
If parts of clouds have small droplets or crystals of similar size, their cumulative effect is seen as colors. The cloud must be optically thin, so that most rays encounter only a single droplet. Iridescence is therefore mostly seen at cloud edges or in semi-transparent clouds, and newly forming clouds produce the brightest and most colorful iridescence. When a thin cloud has droplets of similar size over a large extent, the iridescence takes on the structured form of a corona, a central bright disk around the sun or moon surrounded by one or more colored rings. In one instance a lunar corona was observed, with the iridescent cirrus cloud 11–13.6 km (36,000–45,000 ft) above the mean sea level at a temperature of −70 °C (−94 °F). The pure corona was 9.5 km (31,000 ft) above the mean sea level, at a temperature of −60 °C (−76 °F).