The fleeting glow of noctilucent clouds is once again making its appearance in Earth’s upper atmosphere, signaling the start ...

Noctilucent clouds, Earth's highest clouds, shine blue in the twilight sky from late May to August in the northern hemisphere ...

As the long bands of clouds seemed to lie one atop the other, the western sky became for a few minutes a vast display ... the glories of late autumn, with blue skies, strong winds, swift-sailing ...

Plan for a better outdoor forecast this weekend with highs in the 80s and spotty rain chances Saturday afternoon. Sunday will ...