I find this type of study fascinating. Jamstec used to have a lot of information on their website but much of it seems to have left after a reported breach a couple of years back. They have literature on Modoki La Ninas. Events were the coldest temps are in the central pacific and warmer temps in the east. Their study states these types of events result in a different atmospheric response. Their precip map show wetter that normal conditions for California during these types of events. As far as ENSO goes the one difference this winter seems to be the east tropical Pacific was not as cold as the prior years when the SSTs in the Nino 1.2 at times were from -2 to -.2.5 while the western tropical pacific was near neutral. This winter it seems the temps were fairly uniform across the equator. Not sure how much that was a factor.