Alpenglow happens when low-angle sunlight lights up a mountain summit after the valley below has gone dark. It needs a clear summit and clear sky toward the setting sun.
This is a weather-based forecast, and a visible summit glow is never certain.
Get the Mountain Visibility Forecast app for $1.99 to check summit visibility hour by hour.
Is South Sister out right now?
Low-angle sunlight travels through more atmosphere, scattering shorter wavelengths and leaving more red and orange light to reach the summit.
Yes, if the summit and the sky toward the setting sun remain clear enough for sunlight to reach the mountain.
No. Cloud conditions can change before sunset, and even a clear summit does not guarantee visible alpenglow.
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