What Is a Polar Vortex?

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This NGSS-aligned science passage explains the polar vortex, a swirling mass of cold air that stays near Earth’s poles. Students learn how it strengthens in winter and is held in place by the jet stream. When the jet stream weakens, part of the cold vortex can shift south, causing extreme cold snaps and snow in places far from the poles. The passage also covers how scientists use satellites and weather balloons to study this pattern. With clear vocabulary and real-world examples, this passage supports reading comprehension and Earth and Space Science standards about weather, climate, and atmospheric systems.

Written by Workybooks TeamPublished by Workybooks

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A polar vortex is a large area of swirling cold air that sits over the Earth’s poles—the North Pole and the South Pole. This air is always present, but it becomes stronger in the winter months. The term “vortex” means a spinning motion, like a whirlpool, and in this case, it refers to a spinning mass of cold air high in the stratosphere.

Normally, the polar vortex stays near the poles and is held in place by strong winds called the jet stream. But sometimes, the jet stream weakens or becomes wavy, allowing part of the cold air to break off and move south. When this happens, areas like the United States, Europe, or Asia can experience extremely cold weather.

A polar vortex is not a storm or a snowstorm itself, but it can lead to dangerous cold snaps, snow, and icy conditions. These changes can affect travel, cause school closures, and even lead to power outages.

Scientists monitor the polar vortex using weather balloons and satellites. Understanding it helps meteorologists predict extreme winter weather and prepare people for sudden temperature drops.

Fun Fact: In 2019, a split in the polar vortex brought temperatures as low as –50°F (–45°C) to parts of the U.S.!

What is a polar vortex?

A snowstorm near the polesA spinning mass of cold air over the polesA fast-moving ocean currentA thunderstorm in the Arctic

Where does the polar vortex usually stay?

Near the equatorIn the middle of continentsClose to the polesOver the oceans

What keeps the polar vortex in place?

HurricanesEarth’s rotationJet stream windsThe Moon’s gravity

What can happen when the jet stream weakens?

The polar vortex disappearsWarm air moves to the polesCold air moves south, causing freezing weatherVolcanoes erupt

When is the polar vortex the strongest?

During summerDuring springDuring fallDuring winter

What tools do scientists use to study the polar vortex?

Maps and magnetsWeather balloons and satellitesShips and submarinesCompasses and thermometers

What is the main idea of the passage?

The North Pole is meltingPolar vortexes are the cause of all snowA polar vortex is a swirling cold air mass that can bring extreme winter weatherAll cold air comes from space

What kind of weather can a polar vortex cause?

Hot and sunny daysEarthquakesCold snaps and snowstormsRainy seasons

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