Skip Navigation Links www.nws.noaa.gov 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
Climate Prediction Center

 
  HOME > Climate & Weather Linkage > Teleconnections > North Atlantic Oscillation
 
NAO Banner

  • Current Conditions
  • Outlooks
  • Expert Discussions
  • Composites
  • Linkage to Weather
  • Educational Materials
  • Publications
     
  • Current Conditions

  • The daily NAO index is constructed by projecting the daily (00Z) 500mb height anomalies over the Northern Hemsiphere onto the loading pattern of the NAO.  Please note that year-round monthly mean anomaly data has been used to obtain the loading pattern of the NAO (Methodology).  Since the NAO has the largest variability during the cold sesaon, the loading pattern primarily captures characteristics of the cold season NAO pattern.

    The daily NAO 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 NAO index from 1950 to 2000. A 3-day running mean is applied for the forecast indices.
     
    • Observations
    Observed Daily North Stlantic Oscillation Index.

    [Back to the Top]

     
    • Monthly mean NAO index since January 1950
    • Animations (circulations)

    [Back to the Top]

     
  • Outlooks

  • [Back to the Top]

     
  • Expert Discussions

  • [Back to the Top]

     
  • Composites

  • [Back to the Top]

     
  • Linkage to Weather

  • [Back to the Top]

     
  • Educational Materials

  • [Back to the Top]

     
  • Publications

  • Barnston, A. G., and R. E. Livezey, 1987: Classification, seasonality and persistence of low-frequency atmospheric circulation patterns. Mon. Wea. Rev., 115, 1083-1126.

    Chen, W. Y., and H. van den Dool, 2003: Sensitivity of Teleconnection Patterns to the Sign of Their Primary Action Center, Mon. Wea. Rev., 131, 2885-2899.

    van den Dool, H. M., S. Saha, and Å. Johansson, 2000: Empirical Orthogonal Teleconnections. J. Climate, 13, 1421-1435.

    [Back to the Top]


    NOAA/ National Weather Service
    National Centers for Environmental Prediction
    Climate Prediction Center
    5200 Auth Road
    Camp Springs, Maryland 20746
    Page Author: Climate Prediction Center Internet Team
    Page last modified: December 12, 2005
    Disclaimer
    Information Quality
    Credits
    Glossary
    Privacy Policy
    Freedom of Information Act (FOIA)
    About Us
    Career Opportunities