NOMADS: NCEP server 1 nomad3

Plots, Data, Points of Contact


last update to this web page:20080226

The following table list several data sets. By clicking on the appropriate command, you can (1) make plots, (2) FTP the files to your computer -- slice, dice and subset large files or (3) obtain documentation or (4) use the DODS(OPeN-DAP)/GDS server to get data values directly from our matrix of holdings. At this time, some options are not available.

Nomad3 is running the "development" version of the plotting package.

Data Set freq plot ftp http doc gds contact 1 contact 2
NCEP/DOE Reanalysis (Reanalysis-2)
Reanalysis-2 pressure level 4x daily plot ftp2u |ftp http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 non-pressure level 4x daily plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 spectral sigma analyses 4x daily   N/A http doc   Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 sfcanl (to run model) 4x daily   N/A http doc   Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 pressure level monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 non-pressure level monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 diabatic heating etc monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
NCEP/DOE Reanalysis (Reanalysis-2) Rotating Archive, latest analyses
Reanalysis-2 pressure level 4x daily rotating plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 non-pressure level 4x daily rotating plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Reanalysis-2 model init conditions 4x daily rotating   N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
CDAS-NCEP/NCAR Reanalysis
N/N Reanalysis pressure level 4x daily plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis non-pressure level 4x daily plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis pressure level monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis Gaussian grid non-pressure level monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis lat-lon non-pressure level monthly mean plot N/A http doc DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis rotating 4x daily plot N/A http doc   Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis rotating daily mean plot N/A http doc   Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
N/N Reanalysis obsevation counts monthly mean plot N/A http     Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
NARR: North America Regional Reanalysis - BAMS dvd update
CONUS (grib2) daily mean plot g2sub http doc   Wesley.Ebisuzaki@noaa.gov  
GDAS: FNL Operational Analysis (real time)
GDAS (FNL) analyses (grib2) 4x daily rotating plot g2sub http N/A DODS Wesley.Ebisuzaki@noaa.gov Jun.Wang@noaa.gov
Climate Monitoring (real time)
SST (Reynolds) weekly/monthly means plot N/A http     Diane.Stokes@noaa.gov Wesley.Ebisuzaki@noaa.gov
OLR monthly means plot N/A http     John.Janowiak@noaa.gov Wesley.Ebisuzaki@noaa.gov
OLR/OLRA pentad means plot N/A http     John.Janowiak@noaa.gov Wesley.Ebisuzaki@noaa.gov
CAMS-OPI precipitation monthly plot         John.Janowiak@noaa.gov Wesley.Ebisuzaki@noaa.gov
Climate Monitoring (delayed updates)
AMIP 12 hours plot N/A http   DODS Jordan.Alpert@noaa.gov Suranjana.Saha@noaa.gov
Observations
Clouds from AVhrR (CLAVR) 0.5 deg daily 6-h plot ftp2u http doc DODS jordan.alpert@noaa.gov Kenneth.Campana@noaa.gov
Forecasts
GFS 1x1 (rotating) 6 hours plot g2sub http doc DODS Jordan.Alpert@noaa.gov Wesley.Ebisuzaki@noaa.gov
GFS 0.5x0.5 (rotating) grib2 3 hours plot g2sub http doc DODS Jordan.Alpert@noaa.gov Wesley.Ebisuzaki@noaa.gov
GFS High Resolution 1x1 to 7 days 3 hours plot ftp2u N/A http doc DODS Jordan.Alpert@noaa.gov N/A
GFS High Resolution (0.5 degree, 1 week) 6 hours plot ftp2u N/A http doc DODS Jordan.Alpert@noaa.gov N/A
GFS Low Resolution (2 month archive) 1 day plot N/A http doc DODS Jordan.Alpert@noaa.gov N/A
NAM (WRF-NMM) 6 hours plot ftp2u http doc DODS Jordan.Alpert@noaa.gov Jun.Wang@noaa.gov
SREF 12 hours plot N/A http   DODS Jordan.Alpert@noaa.gov Jun.Wang@noaa.gov
RSM 1 month plot N/A http   DODS Henry.Juang@noaa.gov Jun.Wang@noaa.gov

Definitions and Links

GFS(AVN) Aviation run, now called GFS Global Forecast Model
CDAS Climate Data Assimilation System (Reanalysis), Global T62 Reanalysis model
CAMS Climate anomaly monitoring system
CERES NASA Cloud and Earth Radiant Energy System
CMB Climate modeling branch (EMC)
CMF Coupled model forecast
CPC Climate Prediction Center
EMC Environmental Modeling Center
ERBE NASA Earth Radiation Budget Experiment
ETA high resolution regional model
FNL final analysis, used as initial conditions for the GFS(AVN) and GFS(MRF)
GDAS Global Data Assimilation System, global T126 operational model
GRIB WMO standard for encoding gridded fields
ISCCP International Satellite Cloud Climatology Project
LaRC NASA Langley Research Center
GFS(MRF) Medium Range Forecast, Global operational Forecast System, run at 00Z
MMAB Marine Modeling and Analysis Branch (EMC)
NAM North American Mesoscale
NCEP National Centers for Environmental Prediction, part of NWS
NGM Nested Grid Model, an older regional model
NMM Nonhydrostatic Mesoscale Model
NVAP NASA Water Vapor Project
NWS National Weather Service, part of the Department of Commerce
OI Optimal interpolation
OLR Outgoing Long-wave Radiation
OMB Ocean Modeling Branch (EMC)
PATMOS/CLAVR Pathfinder Atmospheric data/Cloud from AVHRR
RSM Regional Spectral Model
SST Sea surface temperature
TOA Top of atmosphere
TRMM NASA Tropical Rainfall Measurement Mission
WRF Weather Research & Forecasting

Fair Share

Some users apparently don't understand computers. Certain users have overloaded the computer by making a hundred requests at one time. Our software sees that a hundred jobs are running rejects all hundred requests. The user's software sees that all the requests were rejected instantly sends off another hundered requests. His hundred requests come faster than the web server can remove the old jobs and the system eventually crashes. As a bandaid, a 10 second delay was added to the "reject" message. Consequently we only had to reject a 100 requests every 10 seconds. The system didn't crash but the a few users were making the system difficult to use for everybody else.

After many attempts of trying to tune the application software, a different tack was taken. Not nice people had their IP addresses turned off by the firewall for upto five minute at a time. Reasons to get rejected are,

  1. Too many bad requests - 404 missing file (10/minute)
  2. Too many ftp2u requests (10/minute)
  3. Too many hits (100/minute)
  4. Too many bytes transferred (50,000,000 bytes / minute)

The limits are per IP address and the limits will decrease when the machine gets too busy. Have noticed some attempts to get around the limits by using multiple IP addresses. Not a good idea.

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The NWS would like to be acknowledged when the above data/plots are published.
Plots created using GrADS

comments, suggestions: Wesley.Ebisuzaki@noaa.gov