Seasonal Streamfunction Anomaly
PAST 3 MONTHS 250 hPa
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PAST 3 MONTHS 500 hPa

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PAST 3 MONTHS 925 hPa

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Data:  NCEP reanalysis monthly streamfunction (250, 500, and 925 hPa) on a 2.5 x 2.5 deg. lat/lon grid.
Base Period:  1971-2000
Data Source:  NCEP

Description:
The maps above show the seasonal streamfunction climatology (grey contours) and anomalies with respect to the base period 1971-2000 at 250 (top), 500 (middle), and 925 hPa (bottom) for the 3-month season indicated.  Positive anomalies are shown in yellow and orange; negative anomalies in shades of blue. The contour interval for the climatological streamfunction values is 10E+06 m2/s at 250 and 500 hPa and 5E+06 m2/s at 925 hPa. Dashed contours represent negative values, solid contours represent positive values. NCEP is an acronym for the U.S. National Centers for Environmental Prediction.