Explanation#

Why the diagram is the shape it is. Nothing here is needed to use tephpy — the tutorials and how-to guides stand on their own — but a tephigram is an unusual chart, and its oddities all follow from decisions worth understanding.

Where a convention comes from a published chart rather than from the mathematics, the page says so and cites it; References collects those sources.

Why the Axes Are Rotated

The coordinate choice, the perpendicular grid, and the missing pressure axis.

Parcel Ascent and Normand’s Point

What happens to a lifted parcel, and why the energies are areas.