Discussion
Which tropospheric consequence can follow a sudden stratospheric warming?
Answer: A
The weakened stratospheric vortex is often followed within a few weeks by a negative phase of the Northern Annular Mode, with the storm track shifted equatorward and cold outbreaks over northern Europe and eastern North America. This downward influence is one route by which stratospheric prediction contributes to extended range surface forecasting, and the surface effect is cooling rather than warming.
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