The first attachment shows the TAO plots of subsurface temperature means and anomalies for data ending January 28. Per this data, the new downwelling Kelvin wave has continued to slowly evolve with a small pocket of positive anomalies now up to +3.0 deg C.
The second attachment shows the GFS forecast of zonal wind anomalies, updated January 29th (courtesy Carl Schreck). A New WWB is projected to develop between ~140E and ~170E around January 31st, and persist through the first week of February. This would support further strengthening of the developing downwelling Kelvin wave under the Dateline and Central equatorial Pacific.
The third attachment shows the CDAS global SSTA 7-day change, updated January 29th at 12z (courtesy Levi Cowan/tropicaltidbits.com). NOTE: This chart does not depict actual SSTA, just the change in SSTA. Per CDAS data, SSTA in the eastern equatorial Pacific have decreased during the past week, likely associated with the upwelling Kelvin wave in that region. SSTA in the Nino 3.4 region have generally continued to increase during the past week, likely associated with continued westerly wind anomalies in that region (CDAS Nino 3.4 index is up to just about +0.8 as of Jan 29). However, easterly wind anomalies/enhanced trades are projected to re-develop across the central equatorial Pacific during the next several days, and thus it's very likely that SSTA in the Nino 3.4 region will soon begin to decrease (if the forecast develops as advertised). It's interesting to note that most of the BOM's El Nino indicators have at least temporarily returned to borderline El Nino or weak El Nino levels. Such as, cloudiness near the Dateline, SSTA in the Nino 3.4 region, SOI values, and trade winds (I suspect that the active MJO has played a large role in this). The only BOM indicators not inline with weak El Nino conditions are subsurface temps and their ENSO model outlooks.