This is a rare phenomenon called iridescent clouds. It occurs in the clouds with ...

volcanic dusts
sulphuric acid
detergent vapors
small droplets or ice crystals
The effect is similar to irisation. Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light. Larger ice crystals do not produce iridescence, but can cause halos, a different phenomenon.
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volcanic dusts
sulphuric acid
detergent vapors
small droplets or ice crystals
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flagNorway
8%
8%
0%
83%
12
flagRepublic of Ireland
15%
15%
0%
69%
13
flagGreece
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19%
9%
66%
21
flagAustralia
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8%
65%
35
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15%
65%
20
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53
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17%
58%
17
flagthe Netherlands
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8%
58%
12
flagPoland
15%
16%
11%
56%
19982
flagthe United States
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53%
184
flagthe United Kingdom
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7%
50%
114
flagIndia
16%
25%
11%
44%
106
flagthe Philippines
43%
25%
0%
31%
16