The inside of the vortex has a lower air pressure. Lower temp inside gets to near dew point and turns it into visible water vapor." User @the_german_aviator agreed, saying: "it's visible water vapor." ...

Unfortunately like the term “Polar Vortex,” atmospheric rivers have ... like rivers in the sky – that transport most of the water vapor outside of the tropics.” The key words in that ...

“Polar vortex” is one term that multiple meteorologists ... Atmospheric river: a concentrated stream of water vapor in the middle and lower levels of the atmosphere that travels across the ...

These “smoke rings," which are called volcanic vortex rings by scientists, are made up of gas and water vapor shot from a newly formed crater, writes the Washington Post’s Leo Sands.

The water vapor contained in the jet exhaust condenses ... sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence ...

One of those factors is cold, of course, but another is water vapor that is available to freeze into snow. Intriguingly, the Southern Hemisphere is also home to a polar vortex, but that system ...