| Comment | I just googled it and apparently the most common explanation for purple skies at dusk is sea/ocean water evaporating rapidly (more rapidly than normal ) and carrying tiny salt crystals with it, which then refracts light from the sunset to make it purple.
I remember the Saharan sand happening twice in the last couple years, both during big storms. And the entire sky being this weird sickly yellow at sunset. Not sure if that was to do with the sand crystals refracting the light or just the sand itself colouring the clouds. |
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