I've gone back through my printout charts of SSTA evolution during EL Nino fall's and winter (OND, NDJ, and DJF).
Using my strength breakdown list, I analyzed the SSTA evolution for weak, moderate, and strong events.
I've categorized the evolution of each event (of similar strength) and grouped like categories.
This yields the following
Note: when I say "weakened" I mean anomalies weakened through fall and winter. when I say "strengthened" I mean anomalies strengthened through fall into winter.
Weak EL Nino Fall ---> Winter SSTA Evolution
1. EP (Anomalies did not expand or retrograde west)
2. Late blossoming EP (late blossoming EL Nino)
3. Modoki
4. EP (retrograding and weakening anomalies)
5. EP (Anomalies did not expand or retrograde west, but weakened)
6. EP (Core anomalies were located in the western ENSO region and weakened)
Moderate EL Nino Fall ------> Winter SSTA Evolution
1. EP (Anomalies retrograded and weakened)
2. EP (Anomalies did not retrograde or expand west, but weakened)
3. EP (Anomalies expanded west)
4. EP (Expanded through basin and strengthened)*** (by definition this event was a strong one, but borderline so I may remove)
5. Modoki
Strong EL Nino Fall ----> Winter SSTA Evolution
1. EP (Extended through basin and weakened. Became modoki)
2. EP (Extended through basin)
3. EP (Extended through basin and weakened)
4. Modoki became EP
5. (Expanded through basin and strengthened)