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by polar_low 725 days ago
That is correct, as a longer term trend at least while paradoxically, we are also seeing periods of record strength in the Jet Streams.

The truth is there are many oscillations and teleconnections(themselves being impacted by global warming) which influences this temperature gradient on a local/seasonal basis. QBO, El Nino/La Nina and mountain torque events to name a few can move and shift heat at the tropopause in a short period of time and is why we see this wider variance at both ends of the spectrum.