{
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  "provenance": {
    "model": "GFS",
    "dataset": "NOAA GFS 0.25 degree pressure levels",
    "model_run_at": "2026-09-08T00:00:00Z",
    "forecast_hour": 12,
    "quality": "forecast",
    "is_final": false,
    "retrieved_at": "2026-09-13T03:09:27.174917Z",
    "sampled_latitude": 35,
    "sampled_longitude": -118,
    "grid_spacing_degrees": 0.25,
    "source_sha256": "c8d49bd89754f422a25933701f712ef8a830a062d50c8d28c92acaaed30b1a87",
    "processing_version": "atmosphere-0.1.0",
    "spatial_interpolation": "nearest_grid_point",
    "temporal_interpolation": "nearest_available_model_step",
    "vertical_interpolation": "linear_u_v_temperature_specific_humidity_log_pressure_in_geometric_height",
    "height_convention": "spherical_geometric_above_model_geoid_R6371229m",
    "humidity_convention": "relative_to_liquid_water_murphy_koop2005",
    "density_method": "ideal_moist_gas_from_specific_humidity_excludes_condensate",
    "attribution": "Derived from NOAA/NCEP GFS model data; interpolated by this service",
    "source_url": "https://www.nco.ncep.noaa.gov/pmb/products/gfs/",
    "licence_url": "https://www.weather.gov/disclaimer"
  }
}