Omega (vertical velocity) anomaly plot for analogue seasons used for the late Feb-April forecast

Figure 3: Omega (vertical velocity) anomaly plot for analogue seasons used for the 2011-12 seasonal forecast for the late season (February – April). The pattern suggests the SPCZ is likely to be displaced southwest of normal, aligning to the southwestern edge of the Solomon Islands and extending to the southeast over New Caledonia. Despite the normal or reduced TC numbers expected for the late season, the SPCZ position could also generate anomalously high rainfall for island groups like the Solomons, Vanuatu, and New Caledonia. Plotting tools and data kindly provided by the NOAA/CIRES 20th Century reanalysis.