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Attention NOMADS users:
NOAA is migrating all HTTP traffic from HTTP to HTTPS.

Beginning by December 06, 2018, all HTTPS URLs will be available alongside HTTP. Starting as early as December 11, 2018, NCEP will begin to redirect HTTP URLs to HTTPS and disable HTTP access.

More information can be found in the
Service Change Notification
For questions or concerns, please contact:


NOAA Operational Model Archive and Distribution System

Description of NOAA's NOMADS servers hosting NCEP model data

Help Desk: Questions or problems please use the link to submit a service ticket.
Background Background documents about the NOMADS project.
Service Description: OCWWS Service Description Document
Archive of Model Data: Some data sets are archived by NCEI, check availability with the link.
Terms of Data Usage: Use this link to view the Term of Data Usage / Disclaimer.

This server hosts only the parallel data associated with upcoming NCEP model upgrades. This server will host the data through http downloads and on occasion the NOMADS interface services.

NCEP has a subscriber list to make announcements with regards to all of our data servers. Follow this link to subscribe and review the list details.

Click on link in the Data Set field for description and availability info.

Click on the column headings for description of each data access method.

Data Set freq http
Parallel Models
NOAAPORT Data - http
Global Forecast System (GFS) 6 hourly http
Global Data Assimilation System (GDAS) 6 hourly http
AQM hourly http
Blend (National Blend of Models) hourly http
GFSMOS (GMOS) 6 hourly http
EKDMOS 6 hourly http
NWM (National Water Model) 6 hourly http
RTMA (Real-Time Mesoscale Analysis) hourly http
URMA ( UnRestricted Mesoscale Analysis) hourly http

Definitions and Links

EMC Environmental Modeling Center
GRIB WMO standard for encoding gridded fields
NCEP National Centers for Environmental Prediction, part of NWS
NWS National Weather Service, part of the Department of Commerce


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Page last modified: Tuesday, 04-Dec-2018 19:02:10 UTC