FIGURE E8. Northern Hemisphere mean and anomalous
sea level pressure (CDAS/Reanalysis). Mean values are denoted by solid
contours drawn at an interval of 4 hPa. Anomaly contour interval is 2
hPa with values less (greater) than -2 hPa (2 hPa) indicated by dark
(light) shading. Anomalies are calculated as departures from the
1981-2010 base period monthly means.