Monthly Standardized Streamfunction Anomaly and Climatology
LATEST MONTH 250 hPa
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LATEST MONTH 925 hPa

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

Description:
The plot indicates the anomaly in the monthly streamfunction at 250 (top) and 925 hPa (bottom) standardized by dividing by the standard deviation for the base period 1971-2000.  Grey (unlabelled) contours indicate the climatological value of the streamfunction.  Contour interval for anomalies is 0.5 standard deviations.  Positive anomalies shown in red; negative anomalies in blue.   NCEP is an acronym for the National Centers for Environmental Prediction, US.