Type II polar stratospheric clouds (PSCs) are known as one of the most beautiful cloud types in Earth's repertoire, appearing above the Arctic and Antarctic as softly glowing whisps with a ...

a phenomenon known as a sudden stratospheric warming (SSW). The SSW more powerfully weakens the polar vortex, slowing the spin that keeps frigid air at home in the Arctic and allowing it to spill ...

Professor Toon has helped conceive, develop and lead many NASA airborne field missions aimed at understanding stratospheric ... of cloud-related physical processes in models. Professor Randall's ...

The polar vortex could be reversing in a sudden stratospheric warming event, with the potential to send Arctic air and storms to the central and eastern U.S.

"The stratosphere polar vortex is now weakening rapidly. Over the last few days, the forecasts have become very confident and we are almost certain there will be a sudden stratospheric warming in ...

"The next stratospheric event looks stronger than the previous one, and will probably weaken the jet stream pattern. This may allow a release of cold air from the polar regions to move southwards ...

A sudden stratospheric warming occurs when the layer between 10 and 50km above Earth's surface heats up by 50 degrees in just two days. The weather event weakens the polar vortex, which is a large ...