North American Regional Reanalysis Homepage

North American Regional Reanalysis Homepage


Welcome to the National Centers for Environmental Prediction (NCEP) North American Regional Reanalysis (NARR) Homepage! Here you will see all sorts of information regarding the NARR and some of the results. Currently under construction.

Please read the disclaimer.
Please read the privacy and collection of information policy for this website.

Updated 1:00 pm EDT 12 July 2007

NARR DATA AVAILABLE AT NCDC! ALL YEARS 1979-present!! Click here to download data.

Data also available at NCAR. Click here to get data from there. Note that there is a 1/2 month delay before files are available.

NARR Questions and Answers (updated 27 April 2015)

Have a question about NARR? Click here to see if your question can be answered before you contact us.

Click here for latest updates of presentations and documents.

ALERT: MOLTS not available

MOLTS is Model Output Location Time Series. They are files that contain hourly model soundings interpolated to stations. They are BUFR files.

Unfortunately the MOLTS files were not properly created during the execution of the NARR. As a result they are not available, and there are no plans currently to create new files. We apologize for any problems this may have caused.

Sample Downloading Script for NARR data at NCDC

Click here for a sample script for downloading the data at NCDC.
Click here for a guide and another script for downloading the data at NCDC.
Click here for a pdf file that contains the entire list of variables in the files.

North American Regional Reanalysis Workshop

On 11 January 2005, as part of the 85th AMS Annual Meeting, the North American Regional Reanalysis Workshop was held, with presentations from NCEP scientists as well as NARR users. Below is a list of presentations by NCEP scientists, all in Power Point format.
Below is a list of presentations presented by users of the NARR at the NARR Workshop. Format noted.

NARR Climatologies

North American Regional Reanalysis climatologies are now available, courtesy of the Climate Prediction Center. For more information regarding the climatologies, click one of the following:
The climatologies are archived on UCAR's CISL Research Data Archive system. Three climatologies are available:

NARR Fixed Field Files

For the land-sea mask and the latitude and longitude of our grids, as well as other fixed-fields in the NARR, in GRIB format, RIGHT click with your mouse below. After saving these files, if you would like to plot these fields using GrADS, plase use this control file. Note that you can only use this control file on the AWIP32.fixed file.

NARR Production Plots and Files

Updated on 18 November 2004! Data is now available at the National Climatic Data Center (NCDC)! Click here.

Files are now available! Only daily tar files are now available.
Continue to check back to this site frequently for updates. Data is continually being downloaded to the nomad4 server.

What data are on these files? There are two files for each 3-hr time period. Scroll down and click on the sample.a.ctl and the sample.b.ctl files for a list of what is available. These files also serve as GrADS control files should you wish to make plots of the grib files.

The main file (the "a" file, though there is no "a" in the file name) contains the complete archive of all analysis variables valid at the time indicated in the filename. In addition, the "a" file has 3-hr accumulations (e.g. precipitation) and averages (e.g. sensible and latent heat fluxes).

The "b" file contains the instantaneous values of items that were averaged in the "a" file, such as the heat fluxes.

This file here lists the contents of the "merged" files. Note that this is an inventory of our "original" merged files, and the content and organization of files at the two archiving centers differ.

We are in the process of moving the data from our Mass Storage system here at NCEP to our data centers at NCAR, NCDC, and the San Diego Supercomputing Center. That effort is ongoing, since it is a very large dataset that we have to move. When the entire 24-year dataset is available, we will let users know.

To inquire about receiving NARR data, send an email to Fedor Mesinger.

NARR Team Members

Click here to see the NARR team members.

NARR Production System Design

We ran the NARR on an IBM-SP. To keep production on schedule, the NARR was divided into four streams. Here is the time frame of each stream:
Note that there is at least 15 months of overlap between streams. That is due to spin-up issues.

North American Regional Reanalysis CD-ROM

Many of you received a CD-ROM at the 84th AMS Annual Meeting in January 2004 in Seattle, WA. Here is a list of the contents of that CD-ROM.

Eta 32-km/45-layer topography for NARR Production Runs

Here is the topography for the production runs. The plot is courtesy of Matt Pyle of EMC.

Previous Update and Conference Presentations


Email comments to Perry Shafran, administrator of this web page.