Choosing the “Right” Isentropic Surface(s)
The “best” isentropic surface to diagnose low-level moisture and vertical motion varies with latitude, season, and the synoptic situation. There are various approaches to choosing the “best” surface(s):
Use the ranges suggested by Namias (1940) :
- Season Low-Level Isentropic Surface
- Winter 290-295 K
- Spring 295-300 K
- Summer 310-315 K
- Fall 300-305 K