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Zonal Wind Index: Observations and Forecasts at 200mb from NOAA/Climate Prediction Center

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Abstract: [Source: NOAA Climate Prediction Center, ]

The zonal wind indices are obtained by averaging the daily (00Z) zonal wind anomalies over the indicated area. Note that positive values of the 200 hPa zonal wind indices imply easterly anomalies.

The zonal wind indices and their forecasts using MRF and Enesmble mean forecast data are available for the previous 120 days and they are normalized by standard deviation using 1979-1995 base period. A 3-day running mean is applied for the forecast indices.

Wind anomalies are based on the 1979-1995 period.
Related URL
Description: Access to 200mb zonal wind indices graphs and data.
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Geographic Coverage
Spatial coordinates   
  N: 5.0   S: -5.0   E: -110.0   W: -165.0
Min Altitude: 200 MB Max Altitude: 200 MB

Data Set Citation
Dataset Originator/Creator: NOAA/NWS/CPC
Dataset Title: 200 hPa Zonal wind index: Observation and Forecasts
Dataset Series Name: NOAA/NWS/CPC Indices and Forecasts
Dataset Release Date: ongoing
Dataset Release Place: Camp Springs, MD
Dataset Publisher: NOAA National Weather Service, Center for Climate Prediction
Online Resource:
Temporal Coverage
Start Date: 1979-01-01
Data Resolution
Temporal Resolution: Daily, Monthly
Data Set Progress
Originating Center
Distribution Media: online www
Distribution Format: ASCII, graphs
Fees: none
Email: Donald.Garrett at
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-02-14
Last DIF Revision Date: 2017-08-24