In order to help ensure that this web analysis page remains available, we would greatly appreciate feedback on its use, particularily in the clasroom, for presentations or for research. Mail to Cathy Smith at (

Background Information
Related Plot/Analysis
  At this time, the NCEP/NCAR Reanalysis is not being updated at PSD as NCEP has discontinued their distribution. Any of our products or web-tools that use this data will be impacted. Data will be updated once if it becomes available.

We will be transitioning the data files from netCDF3 to netCDF4-classic format. As a result, the files will be compressed instead of being packed with a scale and offset. As with any netCDF4 file, the NetCDF library will perform the uncompression. We expect the files to be read faster, depending on the application you are using. Values may differe slightly because of precision issues. Please let us know if you run into any problems after first reading our netCDF4 doc . We are also changing the time acces to use 1800 as a reference date for udunits. This should prove easier for users.

Monthly/Seasonal Climate Composites

Plot seasonal composites (averages) of the mean or anomalies (mean - total mean) of variables from the NCEP reanalysis and other datasets. NCEP data is available from Jan 1948 to Aug 2014 . Other datasets have different time ranges. Note the climatology used for the anomaly and long term mean plots is now 1981-2010 to match the new climate normal timeperiod.

? Which variable? Level?
? Beginning month of season: Ending month:
? Enter years for composites (from 1 to 20): e.g. 1972. For seasons that span a year (e.g. DJF), please enter year of the LAST month.

To subtract one set of years from another, use a minus sign (-) before the years that are to be subtracted.

? OR Enter range of years: to (optional minus to )
? OR List of years: Enter filename:
? OR Years from values in Time Series:

If CUSTOM Time Series:

? Value to composite on:

Type of comparison:

? Lag: Plot composites for months before or after dates chosen
? Color? Shading:
? Plot type? Mean Anomaly Long Term Mean
? Scale plot size (%)   Plot contour labels? No Yes
? Reverse colorbar? No Yes
? Override default contour interval? Interval: Range: low high
? Map projection

If CUSTOM projection:
Lowest lat: (-90 to 90) Highest lat:
Western-most longitude (0 to 360): Eastern-most longitude:
CUSTOM projection:

Choose height range if CROSSECTION:

Lower level Upper level

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This is a Research and Development Application