A couple days ago, the London sunrise was basically a fade-in from black to light grey. Today, it was stripes of vibrant pink and orange. In both cases, it was cold but not freezing and lightly cloudy. What other factors are causing the sky to look so different every day?
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Clear skies normally produce sunrises of pink or similar colors. This is because when light travels through atmosphere it loses shorter wavelengths leaving only longer wavelengths (like red). When the Sun is just above the horizon it has a lot atmosphere to travel through at an angle, so that’s when this effect is most visible. “Light grey” sunrise means that there are clouds at or beyond the horizon which absorb and re-emit the incoming sunlight in a different, boring cloudy spectrum.
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