One day last week we had a really blue sky. It had been awhile since we'd had one. Instead of blue, sometimes they were kind ...

Noctilucent clouds (NLCs), or polar mesospheric clouds, are breathtaking to see. And these are no ordinary clouds. They form in the highest part of our atmosphere, at an altitude of 80 kilometres.

Cloud computing and blue-sky thinking: An atmospheric scientist illuminates the science of clouds in Earth’s sky and beyond Studying the physics and microphysics of cloud formation and behavior in the ...

Arctic observers got a rare festive treat when rainbow-colored clouds appeared in the skies. So-called polar stratospheric clouds were seen over Norway, Sweden, Finland, Alaska, and Scotland.