Which year is associated with polar vortex collapse as mentioned?

Which year is associated with polar vortex collapse as mentioned?

• A. 2017
• B. 2018
• C. 2019
• D. 2020

Answer: (B)

A polar vortex collapse is when the strong winter circulation around the North Pole in the upper atmosphere weakens or breaks apart, often due to a sudden stratospheric warming. When this happens, the cold Arctic air can spill farther south, producing unusual and severe winter weather in mid-latitudes. In the material you're studying, that breakdown is associated with the year 2018. This link helps you see how changes high in the atmosphere can drive cold outbreaks far from the poles, not just surface weather patterns. The other years aren’t described in that context, so the material points to 2018 as the year of the collapse.

A polar vortex collapse is when the strong winter circulation around the North Pole in the upper atmosphere weakens or breaks apart, often due to a sudden stratospheric warming. When this happens, the cold Arctic air can spill farther south, producing unusual and severe winter weather in mid-latitudes.

In the material you're studying, that breakdown is associated with the year 2018. This link helps you see how changes high in the atmosphere can drive cold outbreaks far from the poles, not just surface weather patterns. The other years aren’t described in that context, so the material points to 2018 as the year of the collapse.