Land masses affect intensity of a polar vortex significantly

Atmospheric air atoms are bonded in a cohesion manner, similar to water in the ocean. When a polar vortex is generated, all the atmosphere layers at the North Pole driven by rotation force would spin. At the North Pole, when a cyclonic wind current in its path is met with blocking mountain ranges, it tends to move around them, taking easier paths. This would have contributed to the Earth embedded tri-core vortex formation that renders the meandering shape jet stream around the vortex boundary as observed on the satellite image of Arctic polar vortex.

Arctic polar vortex on North Pole

Atmospheric layers of Earth

Although the altitude of stratosphere is from 10 kilometers to 50 kilometers, the higher density troposphere air mass at the bottom blocked by mountain ranges acts as a brake, dragging the air at stratosphere from spinning with full strength. This would absolutely reduce the polar vortex intensity at the North Pole, probably, as the result, the vortex eye could not be formed.

This phenomenon could be understood through a whirlpool experiment. A steady whirlpool on right was generated by a vortex machine that simulates dual-axis forces that would form a free vortex. Some stones were placed at the bottom of the tank to simulate the effect of land masses and the vortex immediately looses its intensity and reduce to a blind vortex (not shown), at times the vortex had even dissipated completely. Played around with the arrangement of those stones at the bottom could get an unstable multiple cores blind vortex to form at the surface. When the stones were removed, the intensity of the vortex was observed to built up quickly and the vortex eye was again formed as shown in image. See Tornado Alley that explain how land masses could have diverted the path of a jet stream in a narrow terrain and form a chain of tornadoes when a strong solar system alignment has occurred.

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Ref:
Image of polar vortex on northern hemisphere - Science Daily
Earth's atmosphere Chart - Nasa