Pentad Observed and Anomalous Zonal Wind
OBSERVED ZONAL WIND (m/s) ANOMALOUS ZONAL WIND (m/s)
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Data:   Daily zonal (east-west) wind component on a 2.5 x 2.5 deg. lat/lon grid
Base Period for Climatology:  1961-1990
Data Source:  NCEP, Reanalysis

Description:  Pentad (5-day average) zonal (east-west) wind component averaged from 5S to 5N in units of m/s.  Contours are drawn at intervals of 2 m/s.  For observed winds, negative values indicate easterlies; positive values westerlies.  NCEP is an acronym for the US NAtional Centers for Environmental Prediction.