Purple sky at night—prepare for catastrophe.

The Morning News https://ift.tt/2VJjbk4

As people in Japan prepared to evacuate before Typhoon Hagibis, they looked up and saw an ominous purple sky, a result of “scattering.”

空の色がおかしい....

日本が終わる予兆か？？？ pic.twitter.com/GA5bYH4g74

— あらーとくん⚠️ �� (@ara_to1) October 11, 2019

From this post on my modern met: "Meteorologists say the colorful sky is a result of “scattering”—a weather phenomenon that occurs when heavy rain washes large molecules from the sky, leaving only small molecules. This causes the light to scatter around the moisture in the air, causing the strange violet hues."

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