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396 - ATPL - What is the main cause for the formation of a polar front jet stream?

Question 396 - Meteorology - ATPL - Airline Transport Pilot license

The pressure difference, close to the ground, between a high over the Azores and a low over Iceland
The varied elevations of the tropopause in the polar front region
The north-south horizontal temperature gradient at the polar front
Strong winds in the upper atmosphere

Training tests and timed exam simulations ATPL - Airline Transport Pilot license