According to the text, what is the relationship between the halo and an approaching storm?

Answer

It is a predictor, not the cause of the storm.

The appearance of the ring signals the approach of the high cloud shield preceding a weather front; the ice crystals do not cause the storm itself.

According to the text, what is the relationship between the halo and an approaching storm?

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What does a moon halo mean for snow chances? - YouTube

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