{
 "generated_utc": "2026-08-01T17:27:44Z",
 "gfs_cycle_utc": "2026-08-01T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 498.0,
  "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_20260801_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260801_12Z.geojson.gz"
 },
 "counts": {
  "flights": 45,
  "members": 9,
  "rows": 231390
 },
 "flights": [
  {
   "callsign": "AE0SS-9",
   "flight_id": "AE0SS-9_2026-07-12",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 01:40:35",
   "seed_lat": 33.85425,
   "seed_lon": -115.42858,
   "seed_alt_m": 14321.0,
   "seed_age_h": 327.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 36.84774,
    "lon": -139.59091,
    "alt_m": 14260.6
   },
   "member_spread_deg": {
    "lat": 57.79,
    "lon": 210.92
   },
   "member_spread_now_deg": {
    "lat": 42.27,
    "lon": 67.49
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 00:23:40",
   "seed_lat": -58.52084,
   "seed_lon": -143.99999,
   "seed_alt_m": 12120.0,
   "seed_age_h": 16.94,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": -38.10214,
    "lon": 129.60187,
    "alt_m": 12419.4
   },
   "member_spread_deg": {
    "lat": 13.0,
    "lon": 11.46
   },
   "member_spread_now_deg": {
    "lat": 7.83,
    "lon": 2.28
   },
   "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": 191.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 45.18454,
    "lon": -86.90901,
    "alt_m": 13398.2
   },
   "member_spread_deg": {
    "lat": 37.38,
    "lon": 145.04
   },
   "member_spread_now_deg": {
    "lat": 24.27,
    "lon": 349.41
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 15:13:17",
   "seed_lat": 65.89583,
   "seed_lon": 75.75,
   "seed_alt_m": 12750.0,
   "seed_age_h": 2.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 14:45:00",
    "lat": 42.1893,
    "lon": -84.99716,
    "alt_m": 13269.7
   },
   "member_spread_deg": {
    "lat": 30.28,
    "lon": 90.57
   },
   "member_spread_now_deg": {
    "lat": 0.32,
    "lon": 3.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 16:56:48",
   "seed_lat": 29.3125,
   "seed_lon": -39.0,
   "seed_alt_m": 14670.0,
   "seed_age_h": 0.39,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 17:00:00",
    "lat": 39.97709,
    "lon": 65.41121,
    "alt_m": 14309.0
   },
   "member_spread_deg": {
    "lat": 30.69,
    "lon": 147.82
   },
   "member_spread_now_deg": {
    "lat": 0.01,
    "lon": 0.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 03:49:00",
   "seed_lat": 28.29167,
   "seed_lon": -171.25,
   "seed_alt_m": 13130.0,
   "seed_age_h": 13.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 52.09563,
    "lon": -30.4575,
    "alt_m": 12936.3
   },
   "member_spread_deg": {
    "lat": 25.83,
    "lon": 141.14
   },
   "member_spread_now_deg": {
    "lat": 1.21,
    "lon": 2.74
   },
   "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": 177.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 61.55147,
    "lon": 11.26115,
    "alt_m": 12664.8
   },
   "member_spread_deg": {
    "lat": 19.09,
    "lon": 165.26
   },
   "member_spread_now_deg": {
    "lat": 24.33,
    "lon": 100.95
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 04:48:00",
   "seed_lat": 32.35417,
   "seed_lon": 174.20833,
   "seed_alt_m": 13950.0,
   "seed_age_h": 12.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 33.94785,
    "lon": -42.27748,
    "alt_m": 13717.4
   },
   "member_spread_deg": {
    "lat": 55.91,
    "lon": 352.38
   },
   "member_spread_now_deg": {
    "lat": 3.03,
    "lon": 5.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 09:02:00",
   "seed_lat": 43.9375,
   "seed_lon": 102.125,
   "seed_alt_m": 13020.0,
   "seed_age_h": 8.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 78.77802,
    "lon": -117.44586,
    "alt_m": 12546.1
   },
   "member_spread_deg": {
    "lat": 49.6,
    "lon": 291.38
   },
   "member_spread_now_deg": {
    "lat": 2.18,
    "lon": 2.96
   },
   "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": 98.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 12.78157,
    "lon": -14.47147,
    "alt_m": 9252.9
   },
   "member_spread_deg": {
    "lat": 48.36,
    "lon": 189.1
   },
   "member_spread_now_deg": {
    "lat": 26.78,
    "lon": 57.85
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 169.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 51.99674,
    "lon": 9.9608,
    "alt_m": 8614.1
   },
   "member_spread_deg": {
    "lat": 25.31,
    "lon": 329.91
   },
   "member_spread_now_deg": {
    "lat": 31.0,
    "lon": 69.38
   },
   "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": 81.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 53.61128,
    "lon": -0.72504,
    "alt_m": 12489.8
   },
   "member_spread_deg": {
    "lat": 44.23,
    "lon": 147.9
   },
   "member_spread_now_deg": {
    "lat": 22.87,
    "lon": 28.41
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 81.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 53.02836,
    "lon": 3.7217,
    "alt_m": 12432.3
   },
   "member_spread_deg": {
    "lat": 47.24,
    "lon": 154.61
   },
   "member_spread_now_deg": {
    "lat": 22.54,
    "lon": 28.39
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 08:53:00",
   "seed_lat": 67.89583,
   "seed_lon": 53.04167,
   "seed_alt_m": 12400.0,
   "seed_age_h": 8.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 51.03139,
    "lon": -175.30331,
    "alt_m": 12628.2
   },
   "member_spread_deg": {
    "lat": 36.51,
    "lon": 120.49
   },
   "member_spread_now_deg": {
    "lat": 3.27,
    "lon": 5.94
   },
   "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": 197.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 71.60543,
    "lon": -67.9534,
    "alt_m": 15004.5
   },
   "member_spread_deg": {
    "lat": 42.69,
    "lon": 270.89
   },
   "member_spread_now_deg": {
    "lat": 26.51,
    "lon": 347.12
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 07:55:30",
   "seed_lat": 57.14583,
   "seed_lon": 146.375,
   "seed_alt_m": 12910.0,
   "seed_age_h": 9.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 56.35252,
    "lon": -31.10604,
    "alt_m": 12818.2
   },
   "member_spread_deg": {
    "lat": 29.0,
    "lon": 145.11
   },
   "member_spread_now_deg": {
    "lat": 1.23,
    "lon": 5.91
   },
   "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": 221.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 49.09766,
    "lon": -109.1312,
    "alt_m": 13887.4
   },
   "member_spread_deg": {
    "lat": 67.95,
    "lon": 330.93
   },
   "member_spread_now_deg": {
    "lat": 44.37,
    "lon": 291.14
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 15:25:37",
   "seed_lat": 40.99994,
   "seed_lon": 4.45834,
   "seed_alt_m": 13180.0,
   "seed_age_h": 1.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 15:00:00",
    "lat": 47.98764,
    "lon": 149.64714,
    "alt_m": 13132.7
   },
   "member_spread_deg": {
    "lat": 22.8,
    "lon": 56.32
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.96
   },
   "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": 130.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": 50.7242,
    "lon": 157.0623,
    "alt_m": 13049.8
   },
   "member_spread_deg": {
    "lat": 77.06,
    "lon": 309.14
   },
   "member_spread_now_deg": {
    "lat": 33.41,
    "lon": 77.8
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-422-10",
   "flight_id": "KC3LBR-422-10_2026-01-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 21:57:02",
   "seed_lat": -26.39583,
   "seed_lon": -68.16667,
   "seed_alt_m": 14380.0,
   "seed_age_h": 307.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:30:00",
    "lat": -33.71352,
    "lon": -110.68932,
    "alt_m": 14462.5
   },
   "member_spread_deg": {
    "lat": 49.61,
    "lon": 206.62
   },
   "member_spread_now_deg": {
    "lat": 30.3,
    "lon": 303.69
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 16:57:03",
   "seed_lat": 66.83333,
   "seed_lon": -131.625,
   "seed_alt_m": 13240.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 17:00:00",
    "lat": 56.07825,
    "lon": 0.70936,
    "alt_m": 13555.8
   },
   "member_spread_deg": {
    "lat": 6.81,
    "lon": 67.49
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.16
   },
   "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": 104.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 72.5584,
    "lon": -155.35183,
    "alt_m": 12799.1
   },
   "member_spread_deg": {
    "lat": 35.35,
    "lon": 339.09
   },
   "member_spread_now_deg": {
    "lat": 22.82,
    "lon": 94.07
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 09:45:43",
   "seed_lat": 65.74995,
   "seed_lon": 26.6667,
   "seed_alt_m": 12780.0,
   "seed_age_h": 31.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 11:45:00",
    "lat": 81.69803,
    "lon": -170.39137,
    "alt_m": 11903.3
   },
   "member_spread_deg": {
    "lat": 37.97,
    "lon": 354.1
   },
   "member_spread_now_deg": {
    "lat": 20.26,
    "lon": 11.83
   },
   "display_as": "track",
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   "payload_type": "WSPR",
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   "seed_time": "2026-08-01 16:55:27",
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  {
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  },
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  },
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  },
  {
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  },
  {
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  }
 ]
}