• Observations

• Vertical cross section of NH polar vortex

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• 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)

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• MRF AO outlooks
• Ensemble mean AO outlooks

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• AO composites

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Higgins, R. W., A. Leetmaa, and V. E. Kousky, 2002: Relationships between climate variability and winter temperature extremes in the United States. J. Climate, 15, 1555-1572.

Higgins, R.W., Y. Zhou and H.-K. Kim, 2001: Relationships between El Niño-Southern Oscillation and the Arctic Oscillation: A Climate-Weather Link. NCEP/Climate Prediction Center ATLAS 8. ( Link to Atlas )

Higgins, R. W., A. Leetmaa, Y. Xue, and A. Barnston, 2000: Dominant factors influencing the seasonal predictability of U.S. precipitation and surface air temperature. J. Climate, 13, 3994-4017.

Larson, J., Y. Zhou and R. W. Higgins, 2004: Characteristics of landfalling tropical cyclones in the United States and Mexico: Climatology and Interannual Variability J. Climate (submitted)

Zhou, S., A. J. Miller, J. Wang, and J. K. Angell, 2001: Trends of NAO and AO and their associations with stratospheric processes. Geophys. Res. Lett., 28, 4107-4110.

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