What about using empirical techniques or composites?
The Garcia technique
- Fairly subjective, does not take into account the slope of the isentrope or the movement of the system
The Cook Method
- Probably works because the warm advection at upper levels can be correlated with cyclogenesis.
- Does not measure moisture available for the system or vertical motion.
The Magic Chart
- Uses net vertical displacement and 850 temperature (-3 to -5oC ribbon).
- Does not take into account available moisture or whether there might be a warm layer.
Composites (Goree and Younkin), Browne and Younkin, etc.
- Some cases do not fit the mean patterns. If you rely strickly on composites you’ll miss the outliers.