One of which is a weak polar vortex. This could lead to other big cool downs later this month. The polar vortex is a large circulation of lower pressure and cooler air that's constantly rotating ...

Some winters have a few large polar vortex disruptions. Some winters only have one weak polar vortex disruption. This is one of the factors that creates either a harsh winter or mild winter in the ...

The polar vortex is like a giant ... making places like the United States suddenly feel bone-chillingly cold. A weak vortex allows more arctic air and stormy patterns to develop here in the ...

In summary, a strong polar vortex usually corresponds with a strong and stable jet stream, while a weak polar vortex leads to a weaker and wavier jet stream. The Met Office explains ...

The polar vortex refers to a large area of cold air ... However, sometimes the jet stream can become weak, and this causes some of the arctic air in the upper atmosphere to push further south.

When it’s weak, the cold air frequently spills south. The polar vortex has been “considerably stronger” than usual this year, according to Laura Ciasto, a meteorologist with NOAA’s Climate ...

The polar vortex is an expansive area of low ... However, as revealed by Climate.gov, when the vortex is weak, “strong atmospheric waves” in the troposphere are capable of breaching the ...

This wobbly or weak pattern in the jet stream means that more arctic air and stormy weather are in the forecast. However, the polar vortex is hard to predict past two weeks. There is no need for ...

Several frigid days in Rochester in January were attributed to an intrusion of arctic air caused by a weak polar vortex.

Several frigid days in Rochester in January were attributed to an intrusion of arctic air caused by a weak polar vortex. — Steve Howe reports on weather, climate and the Great Lakes for the ...