However, we probably won’t revisit an Arctic weather pattern like we had in January. We probably will only have a side-swipe of the polar vortex for a day or two in mid-February.

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

The Vortex Solo R/T has an excellent 393-foot (120 meters) field of view at 1,000 yards (131.4 m/1000 m), and the quality of the multicoatings on the lens allowed for some pretty impressive views.

The animation below shows the development of the vortices downwind of either side of the object. Under specific conditions, the atmosphere can produce Von Karman vortex streets as prevailing winds ...

Miles above the Earth, two bands of fast-moving air – the polar jet stream and the stratospheric polar vortex – sometimes tango together to influence weather in the northern hemisphere.