Stargazers in parts of Europe were stunned by an unusual sight on Monday evening: a large, glowing blue spiral in the sky.

But think of dark clouds behind which the sun is hidden. As a cloud comes out from behind the dark clouds into a bright blue sky, it is edged with a silvery lining. Thus we are moving from ...

Sunday turns much colder, with highs in the low to mid-30s. After a few morning clouds, nearly total blue sky is expected in ...

Sunset tonight will feature mostly clear skies with only a few fair weather clouds. No more than about 20% of the sky will ...