Discussion
A winter forecast shows a strong zonal jet across the Atlantic with rapid eastward progression of short waves.
What weather should be expected in northern Europe?
Answer: B
A strong zonal jet corresponds to the positive phase of the Northern Annular Mode, with the storm track directed towards northern Europe and a rapid succession of depressions bringing mild wet conditions. Cold dry conditions accompany the blocked negative phase instead. Stationary systems require blocking, which is exactly what a strong zonal flow prevents.
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