APRIL 2009
![](fige8.gif)
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
indicated by shading.
Anomalies are calculated as departures from the
1979-1995 base period monthly means.
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