Current PSD (Web/Data Status). PSD has undergone major URL restructuring so that all URLs start with http://www.esrl.noaa.gov/psd/ (More Info).
OPeNDAP Data access is now open without IP restrictions.
How to Reference Datasets
You can use the plots produced from this page in publications. We ask that you acknowledge the NOAA/ESRL PSD in the publication. For example, "Image provided by the NOAA/ESRL Physical Science Division, Boulder Colorado from their Web site at http://www.esrl.noaa.gov/psd/".You should also reference the NARR BAMS article for the NARR data itself:
NORTH AMERICAN REGIONAL REANALYSIS: A long-term, consistent, high-resolution climate dataset for the North American domain, as a major improvement upon the earlier global reanalysis datasets in both resolution and accuracy, Fedor Mesinger et. al, submitted to BAMS 2004.