Global Data Assimilation System (GDAS)
![A plot of GDAS output showing the amount of water in snow covering the ground on February 1st, 2012 at 00UTC A plot of GDAS output showing the amount of water in snow covering the ground on February 1st, 2012 at 00UTC](https://webarchive.library.unt.edu/web/20170118232800im_/https://www.ncdc.noaa.gov/sites/default/files/20120201_GSI_Snow_Water_Equiv-small.png)
A plot of GDAS output showing the amount of water in snow covering the ground on February 1st, 2012 at 00UTC. This image was produced by visualizing GDAS output data with NASA’s Panoply visualization tool.
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Product Types
Product | Grid/Scale | Period of Record | Model Cycle | Output Timestep | Data Access Links |
---|---|---|---|---|---|
GDAS Snow, Ice, SST, Satellite, Ship, Aircraft (GRIB and BUFR) | 1° by 1°, 0.5° by 0.5°, 0.25° by 0.25° | 01Jan2001–Present (approx. one year to present online) | 4/day: 00, 06, 12, 18UTC | Anl, +00, +03, +06, +09 hours | FTP HTTPS |
GDAS - Daily Tar Files | 1° by 1° | 01Jan2001–21Feb2012 | 4/day: 00, 06, 12, 18UTC | Anl, +00, +03, +06, +09 hours | HAS |
GDAS - Hourly Tar Files | 1° by 1°, 0.5° by 0.5°, 0.25° by 0.25° | 13Feb2012–Present | 4/day: 00, 06, 12, 18UTC | 4/day: 00, 06, 12, 18UTC | HAS |
GDAS - Daily BUFR Files | 1° by 1°, 0.5° by 0.5°, 0.25° by 0.25° | 13Feb2012–Present | 4/day: 00, 06, 12, 18UTC | Anl, +00, +03, +06, +09 hours | HAS |
Data Usage Notes
None
Publication References
None
Miscellaneous Documentation
NCEP: GFS/GDAS Changes Since 1991
NCEP Global Model and Cycling Analysis Rerun and Retrospective Data, November 2001
NCEP Environmental Modeling Center (EMC) Mesoscale Modeling Branch Publication Listing
Links