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NCEP North American Regional Reanalysis: NARR Pressure level

Main Page | Pressure | Monolevel | Subsurface

The data were updated to add data for 2006/07 - 2009/07/31

See the PSD NARR webpage for more information on PSD's involvement in the NARR project

Brief Description:

  • Very High Resolution Reanalysis of the North American region including assimilated precipitation.

Temporal Coverage:

  • 8-times, Daily and Monthly vaslues for 1979/01/01 to Dec 31, 2013
  • Long Term Daily, Monthly means for years 1979 - 2000.

Spatial Coverage:

  • The native model grid is converted to a Northern Lambert Conformal Conic grid which is what we archive. Corners of this grid are 12.2N;133.5W, 54.5N; 152.9W, 57.3N; 49.4W ,14.3N;65.1W (essentially, North America). The grid resolution is 349x277 which is approximately 0.3 degrees (32km) resolution at the lowest latitude. A page describing the coverage along with information on reading the projection is available.

Levels:

  • 29 pressure levels (hPa):
    1000, 975, 950, 925, 900, 875, 850, 825, 800, 775, 750, 725, 700, 650, 600, 550, 500, 450, 400, 350, 300, 275, 250, 225, 200, 175, 150, 125, 100.
  • Turbulent Kinetic Energy has 1000-600mb.

Update Schedule:

  • Static

Download/Plot Data: Pressure Level Data

Variable Statistic Level Download File Create Plot/Subset
Geopotential Height 3-hourly value 1000-100mb hgt.yyyymm.nc N/A
Geopotential Height Daily Mean 1000-100mb hgt.yyyymm.nc N/A
Geopotential Height Long Term Daily Mean '' hgt.day.ltm.nc N/A
Geopotential Height Monthly Mean '' hgt.mon.mean.nc N/A
Geopotential Height Long Term Monthly Mean '' hgt.mon.ltm.nc N/A
Zonal Wind 3-hourly value '' uwnd.yyyymm.nc N/A
Zonal Wind Daily Mean '' uwnd.yyyymm.nc N/A
Zonal Wind Monthly Mean '' uwnd.mon.mean.nc N/A
Zonal Wind Long Term Daily Mean '' uwnd.day.ltm.nc N/A
Zonal Wind Long Term Monthly Mean '' uwnd.mon.ltm.nc N/A
Meridional Wind 3-hourly value '' vwnd.yyyymm.nc N/A
Meridional Wind Daily Mean '' vwnd.yyyymm.nc N/A
Meridional Wind Monthly Mean '' vwnd.mon.mean.nc N/A
Meridional Wind Long Term Daily Mean '' vwnd.day.ltm.nc N/A
Meridional Wind Long Term Monthly Mean '' vwnd.mon.ltm.nc N/A
Omega 3-hourly value '' omega.yyyymm.nc N/A
Omega Daily Mean '' omega.yyyymm.nc N/A
Omega Monthly Mean '' omega.mon.mean.nc N/A
Omega Long Term Daily Mean '' omega.day.ltm.nc N/A
Omega Long Term Monthly Mean '' omega.mon.ltm.nc N/A
Air Temperature 3-hourly value '' air.yyyymm.nc N/A
Air Temperature Daily Mean '' air.yyyymm.nc N/A
Air Temperature Monthly Mean '' air.mon.mean.nc N/A
Air Temperature Long Term Daily Mean '' air.day.ltm.nc N/A
Air Temperature Long Term Monthly Mean '' air.mon.ltm.nc N/A
Specific Humidity 3-hourly value '' shum.yyyymm.nc N/A
Specific Humidity Daily Mean '' shum.yyyymm.nc N/A
Specific Humidity Monthly Mean '' shum.mon.mean.nc N/A
Specific Humidity Long Term Daily Mean '' shum.day.ltm.nc N/A
Specific Humidity Long Term Monthly Mean '' shum.mon.ltm.nc N/A
Turbulent Kinetic Energy 3-hourly value '' tke.yyyymm.nc N/A
Turbulent Kinetic Energy Daily Mean '' tke.yyyymm.nc N/A
Turbulent Kinetic Energy Monthly Mean '' tke.mon.mean.nc N/A
Turbulent Kinetic Energy Long Term Daily Mean '' tke.day.ltm.nc N/A
Turbulent Kinetic Energy Long Term Monthly Mean '' tke.mon.ltm.nc N/A

Also Available Plotting Pages:

Usage Restrictions:

  • None

Detailed Description:

  • These variables are instantaneous values at the reference time
  • The NARR project is an extension of the NCEP Global Reanalysis which is run over the North American Region. The NARR model uses the very high resolution NCEP Eta Model (32km/45 layer) together with the Regional Data Assimilation System (RDAS) which, significantly, assimilates precipitation along with other variables. The improvements in the model/assimilation have resulted in a dataset with substantial improvements in the accuracy of temperature, winds and precipitation compared to the NCEP-DOE Global Reanalysis 2. We have the model output from Jan 1, 1979-Jun 30 which includes 8 times daily data plus daily and monthly averages. For a complete list of model output variables, see NCEP's variable list.
  • Additional information can be found at NCEP's NARR page.

Caveats:

Related File Naming & Structure Information:

File Names:

  • 8-times daily and daily File names are composed of variable abbreviations and year/month: (variable).(year)(mm).nc(In directory: /Datasets/NARR/ or /Datasets/NARR/Dailies/)
  • Monthly means/ltms are (variable).mon.mean.nc in /Datasets/NARR/Monthlies/

Dataset Format and Size:

  • All data are stored in PSD standard NetCDF files and are (packed).
  • The data are divided by variable and year and month into separate files
  • There are 2100 files currently
  • Size of file is about 1.4G per variable per year/month for 8xdaily data
  • Size of file is about 68M per variable per /month for monthly data
  • Current total of 29.4 Tbytes for 8xDaily.
  • PSD standard NetCDF 68M Mbyte file for each monthly file (packed).
  • PSD standard NetCDF 5 Mbyte file for each long term mean file (packed).
  • 8x daily data are available from ftp.cdc.noaa.gov in /Datasets/NARR/.
  • The 8x data files are quite large, so you may only be able to download them if you have a fast network connection.

Missing Data:

  • Missing data is flagged with a value of 32767s.

Citation:

  • Please note: If you acquire NARR data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as NARR data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the NARR data set freely available online in the future. Thank you!
  • 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.

References:

  • 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.

Original Source:

  • Dataset was originally produced at NOAA's National Center for Atmospheric Prediction (NCEP) and is available in it's original grib format through NOAA NCDC's access page. It is also available in the same format from NCAR.

Contact:

  • Physical Sciences Division: Data Management
    NOAA/ESRL/PSD
    325 Broadway
    Boulder, CO 80305-3328
    esrl.psd.data@noaa.gov