Northern Hemisphere (NH) Available Potential Energy (APE) 1950-2007:
Scroll to the right ----> Daily averaged APE values with shaded standardized anomaly: Grey: +/- 0 to 1 std dev.; Light red or light blue: +/- 1 to 2 std dev.; Dark red or dark blue: greater than 2 std dev.) Data: 2.5-degree NCEP/NCAR Reanalysis. Climatology based on the 58-year dataset.