FIGURE E9. Northern Hemisphere mean and anomalous
500-hPa geopotential height (CDAS/Reanalysis). Mean heights are
denoted by solid contours drawn at an interval of 8 dam. Anomaly
contour interval is 3 dam with values less (greater) than -3 dam (3
dam) indicated by dark (light) shading. Anomalies are calculated as
departures from the 1981-2010 base period monthly means.