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HOME > Monitoring and Data > Monitoring Weather & Climate > Indices and Forecasts > Daily Arctic Oscillation Index

1. Current Conditions
2. Forecasts
3. Expert Discussions
4. Composites
5. Linkage to Weather
6. FAQ's
7. Publications

1. Current Conditions

The daily AO index is constructed by projecting the daily (00Z) 1000mb height anomalies poleward of 20°N onto the loading pattern of the AO.

The daily AO index and its forecasts using MRF and Ensemble mean forecast data are shown for the previous 120 days as indicated and they are normalized by standard deviation of the monthly AO index from 1979 to 2000. A 3-day running mean is applied for the forecast indices.

Observations

Observed Daily Arctic Oscillation Index.

Vertical cross section of NH polar vortex

Monthly mean AO index since January 1950

Graphical format (All calendar months, JFM Seasonal mean)

Tabular format

Ascii format for downloading

Animations (circulations)

30-day 200-hPa Heights

30-day NH 500-hPa Heights

30-day NH 10-hPa Temperatures

30-day NH 30-hPa Temperatures

30-day NH 50-hPa Temperatures

Time-Longitude Sections (circulations)

500-hPa Height Anomalies (45°N-60°N)

500-hPa Height Anomalies (60°N-90°N)

2. Forecasts

3. Expert Discussions

4. Composites

AO composites

5. Linkage to Weather

6. FAQ's

7. Publications


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