NOAA National Digital Forecast Database (NDFD)

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The National Digital Forecast Database (NDFD) is a suite of gridded forecasts of sensible weather elements (e.g., cloud cover, maximum temperature). Forecasts prepared by NWS field offices working in collaboration with the National Centers for Environmental Prediction (NCEP) are combined in the NDFD to create a seamless mosaic of digital forecasts from which operational NWS products are generated. The most recent data is under the opnl and expr prefixes. A copy is also placed under the wmo prefix. The wmo prefix is structured like so: wmo/<parameter>/<year>/<month>/<day>/<wmo-file-name> The wmo filename codes can be deciphered using the spreadsheet in the root of the bucket.

Update Frequency

As often as once every half hour (varies by forecast element, forecast projection, and domain)


Open Data. There are no restrictions on the use of this data.

Documentation, (For NDFD Product information, instructions, and lookup tables)

Managed By

See all datasets managed by NOAA.


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Usage Examples


Resources on AWS

  • Description
    National Digital Forecast Database (NDFD) Grib2 Format
    Resource type
    S3 Bucket
    Amazon Resource Name (ARN)
    AWS Region
    AWS CLI Access (No AWS account required)
    aws s3 ls s3://noaa-ndfd-pds/ --no-sign-request
    Browse Bucket
  • Description
    New data notifications for NDFD, only Lambda and SQS protocols allowed
    Resource type
    SNS Topic
    Amazon Resource Name (ARN)
    AWS Region

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