What is the polar vortex and how does it affect US weather?

The polar vortex is a large-scale atmospheric pattern, a circulating pool of frigid air high above the Arctic. When it weakens or distorts, Arctic cold can travel southward into the US, leading to sharp temperature drops and snow.

How many people are affected by the current winter storm?

At least 177 million people across the United States have been impacted by the snowstorm and harsh winter weather.

Is the polar vortex a storm?

No, according to the National Weather Service, the polar vortex is not a storm but a large-scale atmospheric pattern of frigid air. Its disruptions can influence weather patterns, but day-to-day weather is shaped by other factors.

Home / Weather / Millions Hit by Arctic Blast

Millions Hit by Arctic Blast

24 Jan

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Summary

Winter storm impacts 177 million across the US.
Polar vortex influences Arctic cold reaching the US.
NWS: Vortex is misunderstood, not a single storm.

A widespread snowstorm and severe winter weather conditions have affected at least 177 million individuals throughout the United States. Multiple states in the Northeastern and Mid-Atlantic regions are currently under watches or warnings for icy and snowy conditions.

Forecasters are referencing the polar vortex, a significant atmospheric pattern, in relation to the current winter system. This vortex is a large-scale circulation of frigid air high above the Arctic.

When the polar vortex weakens or becomes distorted, its usual containment of Arctic cold near the North Pole can fail. This allows frigid air to spill southward into the US, potentially causing dramatic temperature drops and increasing the likelihood of snow.