National Digital Guidance Database

www.nws.noaa.gov

Status of NDGD Elements as of November 5, 2008

Access Data

NDFD Home

National Digital Guidance Database

You can access NDGD elements via file transfer protocol (ftp), http, eXtensible Markup Language (XML), or web browser. Links to the data, supporting information and software are listed below:

Request grids in Gridded Binary (GRIB2) format via:

Anonymous ftp over the Internet

For the coterminous U.S. (CONUS), Puerto Rico/the Virgin Islands, Hawaii, and Guam.

Need faster, more reliable ftp access to GRIB2 files? Subscribe to Server Access Service of the Family of Services (ftp via dedicated line–cost-recovery fee)
http over the Internet
Supporting documentation:

NDFD GRIB2 Encoding - how NDFD products are encoded
Data Formats and free GRIB2 decoding software (DeGRIB)
Tutorial: NDFD DeGRIB, Data Download, and Image Generation (pdf), courtesy of NOAA's Coastal Services Center

Pages http://www.weather.gov/ndfd/anonymous_ftp.shtml http://www.weather.gov/ndgd/access_http.shtml can easily be created by examining the appropriate NDGD directories. GT indicates guidance type (e.g., aq, mosgfs, lampgfs, rtma, slosh

Description of NDGD Database Contents

Elements

The NDGD contains data representing the following weather elements. Elements will be added as development of the NDGD progresses. Click here for the latest status.

Elements	No. of Grids	Projections
Gridded Model Output Statistics (GMOS) [00z and 12z GFS model cycles]
Maximum Temperature	8	Every 24 hours, out to 192 hours
Minimum Temperature	8	Every 24 hours, out to 192 hours
Temperature	63	Every 3 hours from 6 to 192 hours
Dewpoint	63	Every 3 hours from 6 to 192 hours
Relative Humidity	63	Every 3 hours from 6 to 192 hours
Wind Direction	63	Every 3 hours from 6 to 192 hours
Wind Speed	63	Every 3 hours from 6 to 192 hours
6-hour Probability of Precipitation	31	Every 6 hours from 12 to 192 hours
12-hour Probability of Precipitation	30	Every 6 hours, from 18 to 192 hours
3-hour Probability of Thunderstorms	26	Every 3 hours from 9 to 84 hours
6-hour Probability of Thunderstorms	31	Every 6 hours from 12 to 192 hours (156 for Alaska )
12-hour Probability of Thunderstorms	30	Every 12 hours, from 18 to 192 hours (156 for Alaska )
Wind Gust	63	Every 3 hours from 6 to 192 hours
Sky Cover	63	Every 3 hours from 6 to 192 hours
6-hour Quantitative Precipitation Forecast	25	Every 6 hours from 12 to 156 hours
12-hour Quantitative Precipitation Forecast	31	Every 6 hours from 18 to 192 hours
24-hour Snowfall Amount	9	Every 12h from 36 to 132 hours
Weather	63	Every 3 hours from 6 to 192 hours
Air Quality [06z and 12z GFS model cycles]
1-hour Average Ozone Concentration	37	Every hour from 6 to 42 hours
8-hour Average Ozone Concentration	37	Every hour from 6 to 42 hours
1-hour Average Surface Smoke	37	Every hour from 6 to 42 hours
1-hour Average Vertical Smoke Integration	37	Every hour from 6 to 42 hours
Local Aviation MOS Program (LAMP) [00z through 23z]
2-hour Probability of Thunderstorms	14	Every hour from 2 to 6 hours, every 2 hours from 7 to 25 hours
2-hour Thunderstorm Best Category	14	Every hour from 2 to 6 hours, every 2 hours from 7 to 25 hours
Ceiling Height	25	Every hour from 1 to 25 hours
SLOSH [Hurricane 04z, 10z, 16z, 22z; Extratropical 00z and 12z GFS model cycle]
Probability of hurricane storm surge >2 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >3 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >4 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >5 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >6 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >7 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >8 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >9 feet	1	Cumulative through 72 hours
Probability of hurricane storm surge >10 feet	1	Cumulative through 72 hours
10% Exceedance hurricane storm surge height	1	Cumulative through 72 hours
Extratropical storm surge height	97	Every hour from 0 hours to 96 hours
Real Time Mesoscale Analysis [00z through 23z]
Temperature	1	Every hour
Dewpoint	1	Every hour
Sky Cover	1	Every hour
Wind Direction	1	Every hour
Wind Speed	1	Every hour
1-hour Precipitation Amount	1	Every hour
Temperature Uncertainty	1	Every hour
Dewpoint Uncertainty	1	Every hour
Wind Direction Uncertainty	1	Every hour
Wind Speed Uncertainty	1	Every hour
Ensemble Kernel Density MOS [00z and 12z GFS model cycles]
Maximum Temperature CDF05	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF10	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF20	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF25	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF30	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF40	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF50	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF60	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF70	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF75	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF80	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF90	16	Every 24 hours from 30 hours to 390 hours
Maximum Temperature CDF95	16	Every 24 hours from 30 hours to 390 hours
Minimum Temperature CDF05	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF10	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF20	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF25	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF30	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF40	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF50	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF60	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF70	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF75	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF80	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF90	15	Every 24 hours from 42 hours to 378 hours
Minimum Temperature CDF95	15	Every 24 hours from 42 hours to 378 hours
Temperature CDF05	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF10	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF20	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF25	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF30	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF40	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF50	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF60	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF70	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF75	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF80	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF90	63	Every 3 hours from 6 hours to 192 hours
Temperature CDF95	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF05	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF10	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF20	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF25	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF30	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF40	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF50	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF60	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF70	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF75	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF80	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF90	63	Every 3 hours from 6 hours to 192 hours
Dewpoint CDF95	63	Every 3 hours from 6 hours to 192 hours

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Office of Climate, Water, and Weather Services
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Silver Spring, MD 20910
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