Equatorial Pacific/Indian Ocean Five-Day Running Average 925 hPa Zonal Wind Anomaly Hovmöller

This is a Hovmöller diagram (Longitude x Time) showing five-day running average zonal wind anomalies at 925 hPa averaged over 5°S to 5°N, for the past 120 days, across the equatorial Indian and Pacific Oceans.

The zonal wind anomalies are contoured at an interval of 1.0 m/s, and shading starts at +/- 1.0 m/s. Positive anomalies (anomalous westerlies) are in red; negative anomalies (anomalous easterlies) are in blue. The base period used to calculate the anomalies is 1991-2020. The longitude domain extends from 50°E to 80°W. On this chart the last 120 days are shown, and time increases vertically. The vertical black line denotes 180° longitude.

Dataset Documentation

925 hPa Zonal Wind Anomalies

NCEP/NCAR Reanalysis daily zonal wind at 925 hPa on 2.5° lat/lon grid
Data Source
NOAA National Centers for Environmental Prediction (NCEP) (NCEP/NCAR Reanalysis)
Equatorial average of five-day running average daily zonal wind anomalies (1991-2020 base period), displayed as a longitude x time Hovmöller diagram


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