PPT Slide
Computing Isentropic Omegas
Essentially there are three approaches to computing isentropic omegas:
- Ground-Relative Method (V ? ?P) :
- Okay for slow-moving systems (?P/ ?t term is small)
- Assumes that the advection term dominates (not always a good assumption)
- System-Relative Method ( (V-C) ? ?P ) :
- Good for situations in which the system is not deepening or filling rapidly
- Also useful when the time step between map times is large (e.g., greater than 3 hours)
- S-R velocity vectors are useful in computing S-R MTVs
- Brute-Force Computational Method ( ?P/ ?t + V ? ?P ):
- Best for situations in which the system is rapidly deepening or filling
- Good approximation when data are available at 3 h or less interval, allowing for good estimation of local time tendency of pressure