‘Watermelon snow’ turning snow pink at Mount St. Helens

Cold-loving green algae can cause snow to have a reddish tint in high elevation environments.

Editor’s note: The above video on “watermelon snow” originally aired in June 2018.

SEATTLE – If you’ve been hiking recently and spotted some red or pink snow, there’s a chance you saw “watermelon snow.”

U.S. Forest Service officials said Monday that the phenomenon, which is also called “red snow” or “blood snow,” has appeared at Mount St. Helens. Although it isn’t a new phenomenon, it triggered a lot of questions recently for park rangers from curious visitors.

Watermelon snow is caused by cold-loving green algae, according to

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