|Data: NCEP reanalysis monthly geopotential height
(250, 500, and 925 hPa) on a 2.5 x 2.5 deg. lat/lon grid.
Base Period: 1971-2000
Data Source: NCEP
The maps above show the seasonal geopotential height climatology (grey
contours) and anomalies standardized by the standard
deviation for the 3-month season shown, over the base period 1971-2000
at 250 (top), 500 (middle), and 925 hPa (bottom).
The shading for the anomalies starts at +/-1 standard deviation; the color contour
interval is 0.5 s.d. Positive anomalies are shown in yellow and
orange; negative anomalies in shades of blue. The climatology contour interval in the
250 and 500 hPa maps is 60 gpm, and in the 925 hPa map is 30 gpm. NCEP is an acronym for
National Centers for Environmental Prediction.