These maps display the potential temperature on the dynamical
tropopause (color contours), which is defined as the surface having potential
vorticity q of 2.0 PVU (1 PVU = 106 m2 K kg-1 s-1).
The contour interval of potential temperature is 5 K, with the most extreme
purple being 280 K and the most extreme red 375 K. Also shown are the 850 mb saturation equivalent potential temperature (dashed
black contours, with contour interval of 5 K) and the surface pressure (solid
black contours, labelled in hPa).
and interpretation of the maps
Problems, questions, or comments? Contact Neil Zimmerman, nlz at mit edu