{
 "generated_utc": "2026-08-04T05:27:39Z",
 "gfs_cycle_utc": "2026-08-04T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 497.0,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260804_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260804_00Z.geojson.gz"
 },
 "counts": {
  "flights": 38,
  "members": 9,
  "rows": 190530
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 21:43:40",
   "seed_lat": -43.64584,
   "seed_lon": -84.62499,
   "seed_alt_m": 12360.0,
   "seed_age_h": 7.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": -50.44554,
    "lon": 175.69884,
    "alt_m": 12772.0
   },
   "member_spread_deg": {
    "lat": 15.22,
    "lon": 345.01
   },
   "member_spread_now_deg": {
    "lat": 0.95,
    "lon": 1.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 251.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 67.46948,
    "lon": -139.14149,
    "alt_m": 13100.2
   },
   "member_spread_deg": {
    "lat": 43.29,
    "lon": 167.86
   },
   "member_spread_now_deg": {
    "lat": 32.48,
    "lon": 336.3
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 23:50:19",
   "seed_lat": 78.27083,
   "seed_lon": -178.45833,
   "seed_alt_m": 12360.0,
   "seed_age_h": 5.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 32.79409,
    "lon": -77.74649,
    "alt_m": 13275.1
   },
   "member_spread_deg": {
    "lat": 37.24,
    "lon": 156.39
   },
   "member_spread_now_deg": {
    "lat": 0.82,
    "lon": 12.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 18:59:49",
   "seed_lat": 28.125,
   "seed_lon": -33.70833,
   "seed_alt_m": 14500.0,
   "seed_age_h": 10.34,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 46.05845,
    "lon": 114.34193,
    "alt_m": 14067.3
   },
   "member_spread_deg": {
    "lat": 11.36,
    "lon": 81.21
   },
   "member_spread_now_deg": {
    "lat": 4.63,
    "lon": 7.01
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:01:30",
   "seed_lat": 28.33333,
   "seed_lon": -171.70833,
   "seed_alt_m": 13070.0,
   "seed_age_h": 1.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 03:30:00",
    "lat": 36.86082,
    "lon": -129.65882,
    "alt_m": 13074.1
   },
   "member_spread_deg": {
    "lat": 19.55,
    "lon": 94.65
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 237.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 69.55868,
    "lon": 61.54268,
    "alt_m": 12696.3
   },
   "member_spread_deg": {
    "lat": 34.62,
    "lon": 287.32
   },
   "member_spread_now_deg": {
    "lat": 38.95,
    "lon": 202.69
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 01:23:00",
   "seed_lat": 24.875,
   "seed_lon": -146.33333,
   "seed_alt_m": 13840.0,
   "seed_age_h": 3.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 01:00:00",
    "lat": 33.24726,
    "lon": -123.45404,
    "alt_m": 13997.0
   },
   "member_spread_deg": {
    "lat": 46.81,
    "lon": 35.16
   },
   "member_spread_now_deg": {
    "lat": 1.13,
    "lon": 2.47
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:37:00",
   "seed_lat": 46.70833,
   "seed_lon": 164.625,
   "seed_alt_m": 13380.0,
   "seed_age_h": 0.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 04:30:00",
    "lat": 27.24653,
    "lon": -142.94114,
    "alt_m": 13604.4
   },
   "member_spread_deg": {
    "lat": 23.27,
    "lon": 83.67
   },
   "member_spread_now_deg": {
    "lat": 0.41,
    "lon": 0.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 158.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 31.59795,
    "lon": 57.60154,
    "alt_m": 9146.6
   },
   "member_spread_deg": {
    "lat": 27.88,
    "lon": 144.27
   },
   "member_spread_now_deg": {
    "lat": 43.02,
    "lon": 131.78
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 229.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 34.33237,
    "lon": -34.99915,
    "alt_m": 8699.5
   },
   "member_spread_deg": {
    "lat": 41.34,
    "lon": 322.26
   },
   "member_spread_now_deg": {
    "lat": 27.61,
    "lon": 299.26
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 141.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 66.09699,
    "lon": -19.25729,
    "alt_m": 12113.9
   },
   "member_spread_deg": {
    "lat": 45.01,
    "lon": 260.94
   },
   "member_spread_now_deg": {
    "lat": 31.65,
    "lon": 347.16
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 141.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 34.69793,
    "lon": -66.29843,
    "alt_m": 12799.6
   },
   "member_spread_deg": {
    "lat": 29.6,
    "lon": 148.32
   },
   "member_spread_now_deg": {
    "lat": 26.41,
    "lon": 353.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:13:00",
   "seed_lat": 58.72917,
   "seed_lon": 124.875,
   "seed_alt_m": 12250.0,
   "seed_age_h": 1.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 03:45:00",
    "lat": 63.79253,
    "lon": -35.67359,
    "alt_m": 12063.4
   },
   "member_spread_deg": {
    "lat": 28.44,
    "lon": 90.89
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 257.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 68.2613,
    "lon": -84.86412,
    "alt_m": 15045.4
   },
   "member_spread_deg": {
    "lat": 37.65,
    "lon": 338.74
   },
   "member_spread_now_deg": {
    "lat": 25.98,
    "lon": 283.53
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:03:00",
   "seed_lat": 64.5625,
   "seed_lon": -157.70833,
   "seed_alt_m": 12700.0,
   "seed_age_h": 1.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 03:30:00",
    "lat": 29.31092,
    "lon": -79.94154,
    "alt_m": 13514.6
   },
   "member_spread_deg": {
    "lat": 46.67,
    "lon": 130.96
   },
   "member_spread_now_deg": {
    "lat": 1.45,
    "lon": 1.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 281.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 43.46747,
    "lon": -30.32635,
    "alt_m": 13858.7
   },
   "member_spread_deg": {
    "lat": 101.0,
    "lon": 263.97
   },
   "member_spread_now_deg": {
    "lat": 35.65,
    "lon": 249.22
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 14:10:37",
   "seed_lat": 43.77078,
   "seed_lon": 25.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 15.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 32.54326,
    "lon": -170.45901,
    "alt_m": 13319.9
   },
   "member_spread_deg": {
    "lat": 54.98,
    "lon": 313.57
   },
   "member_spread_now_deg": {
    "lat": 3.08,
    "lon": 5.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 190.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 21.76892,
    "lon": -162.90758,
    "alt_m": 13222.6
   },
   "member_spread_deg": {
    "lat": 60.89,
    "lon": 336.42
   },
   "member_spread_now_deg": {
    "lat": 63.38,
    "lon": 298.38
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 03:40:33",
   "seed_lat": 57.0,
   "seed_lon": -112.875,
   "seed_alt_m": 13280.0,
   "seed_age_h": 1.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 03:15:00",
    "lat": 61.84195,
    "lon": -6.60583,
    "alt_m": 13450.9
   },
   "member_spread_deg": {
    "lat": 28.9,
    "lon": 81.22
   },
   "member_spread_now_deg": {
    "lat": 0.49,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 164.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:45:00",
    "lat": 69.13962,
    "lon": -165.72912,
    "alt_m": 12997.7
   },
   "member_spread_deg": {
    "lat": 26.01,
    "lon": 353.64
   },
   "member_spread_now_deg": {
    "lat": 17.72,
    "lon": 235.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 41.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 67.35211,
    "lon": 49.8622,
    "alt_m": 12416.7
   },
   "member_spread_deg": {
    "lat": 37.05,
    "lon": 348.46
   },
   "member_spread_now_deg": {
    "lat": 7.04,
    "lon": 27.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:00:00",
   "seed_lat": 37.02083,
   "seed_lon": -150.04167,
   "seed_alt_m": 12800.0,
   "seed_age_h": 1.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 03:30:00",
    "lat": 43.8113,
    "lon": 2.63596,
    "alt_m": 12845.2
   },
   "member_spread_deg": {
    "lat": 42.69,
    "lon": 221.34
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 23:36:00",
   "seed_lat": 52.47917,
   "seed_lon": -108.5,
   "seed_alt_m": 12260.0,
   "seed_age_h": 5.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 23:30:00",
    "lat": 57.75452,
    "lon": -92.06774,
    "alt_m": 12137.5
   },
   "member_spread_deg": {
    "lat": 9.47,
    "lon": 49.62
   },
   "member_spread_now_deg": {
    "lat": 0.93,
    "lon": 0.88
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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  },
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  },
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  },
  {
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   "flight_id": "N0MPM-31_2026-04-16",
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   "seed_time": "2026-07-21 23:53:19",
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  },
  {
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  },
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  },
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   "seed_time": "2026-07-22 14:00:27",
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  },
  {
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  },
  {
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  {
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  },
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  {
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  {
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   "payload_type": "WSPR",
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  }
 ]
}