I don't know if this has been mentioned before.. but beware of taking any heart in SST anomalies that happen on a daily basis. Too much can happen from day to day that doesn't give any real representation of what is occurring.. more like noise for sure. I would take a longer average... at least a week... to get a sense of what is really going on. For example, the Madden-Julian Oscillation is well-known to change wind/pressure patterns and affect SSTs in that way. For that reason I would typically recommend averaging over the past month (anomaly-wise) to get a real sense of what is happening. The shelf waters in the GOM warm up no matter what is happening with fronts... the sun angle gets brutal in the next month or two. I expect the monday weekly SST analyses to show some warming in the tropical Atlantic Ocean... which is the area to watch for those who like tropical cyclones
As far as La Nina goes.. it has weakened some over the past month.. they typically do at this time of the year as the sun moves directly over the equator and has a tendency to warm the waters no matters what. i think once the southern pacific itcz goes away in late april it may start to cool again (because then the enhanced trades would flow straight to the n pacific itcz rather than being cutoff to the south). that is just speculation though as i haven't seen any research there.