NOAA_Enso_fig3 Published September 12, 2009 at 569 × 321 in El Niño is expected to strengthen and last through the Northern Hemisphere winter 2009-2010 ← Previous Next → Figure 3. Area-averaged upper-ocean heat content anomalies (°C) in the equatorial Pacific (5°N-5°S, 180º-100ºW). Heat content anomalies are computed as departures from the 1982-2004 base period pentad means.