"I've been on the lookout for polar stratospheric clouds (PSCs) all winter," Broms told spaceweather.com. "This morning, I caught a split-second glimpse of some really colourful PSCs, and within ...

Nacreous clouds are also called Type II polar stratospheric clouds (PSCs), which are clouds that form in the winter polar stratosphere. However, whereas nacreous clouds are composed only of ice ...

"The clouds brighten up the winter, lingering in the sky an hour ... Tuomas Olkkonen snapped these photographs of the polar stratospheric clouds above Jyväskylä, Finland. "Earlier that day ...

The clouds, known as polar stratospheric clouds (PSC), only form ... normally during the colder winter months, according to Spacewaether.com. However, experts believe that both types of PSCs ...

WASHINGTON (7News) — Early indications of a weakening polar vortex could send Arctic air into North America next month. Much of the U.S. is overdue for some cold air and winter-like temperatures ...

At least qualitatively, it does seem like the stratospheric polar vortex has extended over North America more than it normally does this winter. However, there are a few reasons we feel like that ...

"Don't put your winter ... to the Polar Vortex Blog. The polar vortex might not recover its strong west-to-east winds after ...

The United States has been experiencing severe winter storms ... There are two types of polar vortexes – tropospheric and stratospheric. The tropospheric polar vortex occurs at the lowest ...

The polar vortex forms in the Arctic Circle in the winter months due to the lack ... It's called "Sudden Stratospheric Warming," when the region where the polar vortex resides begins to warm.