Thermal Wind Relationship in Isentropic Coordinates
Usually only the wind component normal to the plane of the cross section is plotted; positive (negative) values indicate wind components into (out of) the plane of the cross section.
With north to the left and south to the right:
- when isentropes slope down, the thermal wind is into the paper, i.e, the wind component into the cross-sectional plane increases with height
- when isentropes slope up, the thermal wind is negative, i.e., the wind component out of the cross-sectional plane increases with height.