Weather Words: Alpenglow | Weather.com
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Weather Words: Alpenglow

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If you have ever been lucky enough to spend some time near the mountains, more specifically, soaking in a sunrise or sunset near the mountains, you may have been lucky enough to witness Alpenglow.

Alpenglow comes from the German words Alpen (alps) and glühen (to glow). A phenomenon that most definitely occurs in the Alps, as well as other dramatic mountains such as the Rockies and Sierras, this occurs when the sunlight lights up only the mountain peaks in beautiful glowing tones of red and pink.

Denali during sunset at midnight seen from backcountry Unit 13 on June 14, 2019.
Denali during sunset at midnight seen from backcountry on June 14, 2019.
(NPS Photo / Emily Mesner)
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Scientists believe that the reason red colors show up on the mountainside has to do with the different wavelengths of color and how they travel through the atmosphere. Red has one of the longest wavelengths and can travel farthest. Red can also bend through the atmosphere, as opposed to blue light, which is scattered. This is most likely why red tones show up on the mountains even after the sun has disappeared below the horizon.

When pollutants are present in the atmosphere, such as particulate matter from wildfires, the colors may seem even more dramatic.

So next time you are near the mountains during sunrise or sunset, don’t forget to look up, alpenglow might be lighting up the mountainside and you won’t want to miss it.

J​ennifer Gray is a weather and climate writer for weather.com. She has been covering some of the world's biggest weather and climate stories for the last two decades.

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