What is the significance of high versus low contours?
From the first paragraph, in cold air the ‘column’ of the infinite number of slices collapses downwards, and in warm air, the ‘column’ expands upwards: So, in summary: a cold troposphere is associated with low contour values. a warm troposphere is associated with high contour values. And further, as a very rough/first approximation: higher contour values are associated with warmer weather; lower contour values with colder weather, or Polar/low contours vs. Sub-Tropical/high contours. (This doesn’t always hold true right at the bottom of the atmosphere of course: it is not unusual for cold, low level air to undercut warmer air aloft with high contour values, and vice-versa.
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