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HOME > Monitoring and Data > Monitoring Weather & Climate > Blocking > Observed Southern Hemisphere Atmospheric Blocking

All colored regions in the hovmoller plot below depict regions where the flow is blocked according to the blocking index. The color scheme denotes the strength of the blocked flow as determined from the 500 hPa geopotential height gradient measured from the blocking ridge equatorward (denoted GHGN in blocking index definition). The presence of an intense cutoff low equatorward of the blocking ridge can act to enhance the blocking strength..

Blocking Strength Observations.
500 hecto Pascals Geoopotential height and Anomalies.

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