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I’m studying meteorology for PPL and after learning the big differences between cyclones and anticyclones, I came across a question that flipped all my knowledge on its head:

What pressure pattern may result from cold-air inflow in high tropospheric layers?

A: Formation of a low in the upper troposphere

I’ve spent hours on all facets of this question and I still don’t understand how cold air inflow can create a low in the upper tropospheric layers.

Apparently this cold air inflow at high tropospheric layers triggers a through, which would be a catalyst for ts and cb.

But at the same time it doesn’t make it clear how cold air can create a low, cyclone, which is actually characterized by rising warm air that cools.

There is a variation of this q that talks about what weather conditions should be expected in an upper level through and it suggests that‘s development of showers and thunderstorms.

But I thought throughs in lows happen at ground level, because air rises in lows.

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  • $\begingroup$ These days when we can just check the near-term forecasts on the internet, it seems odd to have that kind of detailed theoretical meteorological question on the PPL exam! $\endgroup$
    – quiet flyer
    Mar 13 at 10:12
  • $\begingroup$ I agree, and what’s worse is many questions only make more sense once you tap into ATPL resources. It’s either books need updating or questions need to be less ambiguous. $\endgroup$
    – GANoob4eva
    Mar 13 at 10:54
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    $\begingroup$ Best book on aviation weather theory, bar none, is the manual published for Royal Canadian Air Force pilot training. It's a fundamental part of the ATPL knowledge base. Extremely well written. publications.gc.ca/site/eng/9.652598/…. $\endgroup$
    – John K
    Mar 13 at 14:24

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