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          "field": "reflectivity_horizontal",
          "label": "Reflectivity",
          "units": "dBZ",
          "sweep_index": 0,
          "elevation_deg": 0.5,
          "sweep_start_utc": "2015-12-15T23:48:03Z",
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          "image_encoding": "lossless WebP"
        },
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          "image": "radar-images/kurnell-2015/54_20151215_234803.pvol.h5_VEL.webp",
          "field": "velocity_horizontal",
          "label": "Radial velocity",
          "units": "m/s",
          "sweep_index": 0,
          "elevation_deg": 0.5,
          "sweep_start_utc": "2015-12-15T23:48:03Z",
          "sweep_end_utc": "2015-12-15T23:48:03Z",
          "valid_gates": 74407,
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          "image_encoding": "lossless WebP"
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        "CC": null
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      "volume_start_utc": "2015-12-15T23:48:03Z"
    },
    {
      "file": "54_20151215_235408.pvol.h5",
      "source_url": "https://thredds.nci.org.au/thredds/fileServer/rq0/54/2015/vol/54_20151215.pvol.zip",
      "archive_member": "54_20151215_235408.pvol.h5",
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      "key": "54_20151215_235408.pvol.h5",
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          "field": "reflectivity_horizontal",
          "label": "Reflectivity",
          "units": "dBZ",
          "sweep_index": 0,
          "elevation_deg": 0.5,
          "sweep_start_utc": "2015-12-15T23:54:08Z",
          "sweep_end_utc": "2015-12-15T23:54:08Z",
          "valid_gates": 83526,
          "minimum": -30.0,
          "maximum": 53.5,
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          "original_image": "radar-images/kurnell-2015/54_20151215_235408.pvol.h5_REF.png",
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          "image_encoding": "lossless WebP"
        },
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          "image": "radar-images/kurnell-2015/54_20151215_235408.pvol.h5_VEL.webp",
          "field": "velocity_horizontal",
          "label": "Radial velocity",
          "units": "m/s",
          "sweep_index": 0,
          "elevation_deg": 0.5,
          "sweep_start_utc": "2015-12-15T23:54:08Z",
          "sweep_end_utc": "2015-12-15T23:54:08Z",
          "valid_gates": 82412,
          "minimum": -19.860469818115234,
          "maximum": 19.860414505004883,
          "image_sha256": "82b6af52380d0ffb53d1c3386a6a5abd49a1e911aca807539efb42a7aaaf046f",
          "original_image": "radar-images/kurnell-2015/54_20151215_235408.pvol.h5_VEL.png",
          "original_image_sha256": "29f0f31cc9eed6f253ac6c2effa0400676829fbe2361bdd7760acf15af78e267",
          "image_encoding": "lossless WebP"
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      "volume_start_utc": "2015-12-15T23:54:08Z"
    }
  ],
  "method": "Native ODIM polar-volume observations from Kurnell radar (AU54), 0.5\u00b0 sweep, roughly six-minute cadence. Raw radial velocity, not dealiased or storm-relative. No RhoHV in these historical files. Town crosses are geographic references; the image does not show the tornado itself.",
  "archive_note": "19 real scans \u00b7 approximately 6 minutes apart \u00b7 RhoHV unavailable. Local event date: 16 December; these UTC scans are on 15 December.",
  "built_utc": "2026-10-12T09:21:21.592918+00:00",
  "tornado_track": null
}