Top figure:
Dynamic Tropopause (1.5 PVU theta every 5 K), with winds in m/s. Levels of theta are drawn
from the top-down, so PV > 1.5 in the lower troposphere is drawn over the tropopause theta.
Bottom figure:
925-hPa theta (every 3 K), sea level pressure (hPa), and 750-mb relative humidity (green fill,
every 10% starting at 70%)