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GRAF Reforecast

atmosphere cloud amount ERA5 forecast geoscience geospatial model MPAS near-surface air temperature near-surface relative humidity precipitation visibility weather wind speeds zarr

Description

A zarr-formatted dataset of 1836 reforecast cases (approx. 5 years) from The Weather Company GRAF (Global high-Resolution Atmospheric Forecasting) model, a version of the National Center for Atmospheric Research (NCAR) Model for Predictions Across Scales (MPAS). GRAF is global, but the configuration for this reforecast had a mesh refinement to approx. 4 km over the US, Caribbean Basin, and Europe, and 15 km elsewhere. This model was designed to run much of its computation on graphical processing units, with this development assisted by NVIDIA. The 1836 cases (approx. 5 years) were generated from ECMWF reanalyses (ERA5) for initial condition dates spanning more than 20 years, 2004-2024. These dates of the chosen initial conditions mostly selected based on high-impact weather in the contiguous US (CONUS) and Caribbean. Sampling in this way spanned a wider range of interesting, high-impact weather scenarios than were there five contiguous years of data. GRAF reforecasts were mostly run to +27 h lead time, assuming a 3-h for spin up followed by a full diurnal cycle. Data were saved in zarr format on the native model vertical coordinate. Most fields were saved at 15-min intervals, though several precipitation variables were saved at 5-min cadence.

Update Frequency

One time push only

License

CC BY 4.0

Documentation

Documentation

Managed By

The Weather Company

See all datasets managed by The Weather Company.

Contact

graf.reforecast@weather.com

How to Cite

GRAF Reforecast was accessed on DATE from https://registry.opendata.aws/graf-reforecast.

Usage Examples

Publications

Resources on AWS

  • Description
    GRAF Reforecast dataset
    Resource type
    S3 Bucket
    Amazon Resource Name (ARN)
    arn:aws:s3:::twc-graf-reforecast
    AWS Region
    us-west-2
    AWS CLI Access (No AWS account required)
    aws s3 ls --no-sign-request s3://twc-graf-reforecast/
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