{
 "generated_utc": "2026-07-31T05:27:57Z",
 "gfs_cycle_utc": "2026-07-31T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 482.5,
  "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_20260731_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260731_00Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 254160
 },
 "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": 291.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 36.89906,
    "lon": -126.3492,
    "alt_m": 14265.0
   },
   "member_spread_deg": {
    "lat": 65.0,
    "lon": 126.09
   },
   "member_spread_now_deg": {
    "lat": 29.09,
    "lon": 56.1
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 03:13:40",
   "seed_lat": -60.3125,
   "seed_lon": 178.33334,
   "seed_alt_m": 12030.0,
   "seed_age_h": 2.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 02:45:00",
    "lat": -58.41797,
    "lon": 78.60937,
    "alt_m": 12712.3
   },
   "member_spread_deg": {
    "lat": 12.34,
    "lon": 86.28
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 1.24
   },
   "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": 155.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 53.03911,
    "lon": -75.01784,
    "alt_m": 13199.5
   },
   "member_spread_deg": {
    "lat": 59.56,
    "lon": 347.17
   },
   "member_spread_now_deg": {
    "lat": 14.11,
    "lon": 79.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 12:50:18",
   "seed_lat": 56.52083,
   "seed_lon": 13.66667,
   "seed_alt_m": 12770.0,
   "seed_age_h": 40.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 54.98936,
    "lon": -164.84072,
    "alt_m": 12905.0
   },
   "member_spread_deg": {
    "lat": 35.2,
    "lon": 335.52
   },
   "member_spread_now_deg": {
    "lat": 5.61,
    "lon": 16.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 21:05:48",
   "seed_lat": 47.625,
   "seed_lon": -55.20833,
   "seed_alt_m": 14230.0,
   "seed_age_h": 8.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": 52.87485,
    "lon": 43.11908,
    "alt_m": 14014.0
   },
   "member_spread_deg": {
    "lat": 16.64,
    "lon": 113.95
   },
   "member_spread_now_deg": {
    "lat": 2.17,
    "lon": 8.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 02:49:00",
   "seed_lat": 35.02083,
   "seed_lon": -157.58333,
   "seed_alt_m": 13050.0,
   "seed_age_h": 2.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 02:15:00",
    "lat": 58.48806,
    "lon": -149.11813,
    "alt_m": 12698.7
   },
   "member_spread_deg": {
    "lat": 56.24,
    "lon": 101.31
   },
   "member_spread_now_deg": {
    "lat": 0.33,
    "lon": 1.16
   },
   "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": 141.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 65.13211,
    "lon": -10.03991,
    "alt_m": 12766.4
   },
   "member_spread_deg": {
    "lat": 18.22,
    "lon": 178.29
   },
   "member_spread_now_deg": {
    "lat": 24.41,
    "lon": 87.15
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:38:00",
   "seed_lat": 49.45833,
   "seed_lon": 175.54167,
   "seed_alt_m": 13560.0,
   "seed_age_h": 0.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 04:15:00",
    "lat": 47.18325,
    "lon": -123.72233,
    "alt_m": 13619.1
   },
   "member_spread_deg": {
    "lat": 57.54,
    "lon": 322.11
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 03:57:00",
   "seed_lat": 52.0,
   "seed_lon": 80.625,
   "seed_alt_m": 13010.0,
   "seed_age_h": 1.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 03:30:00",
    "lat": 17.04999,
    "lon": -165.32138,
    "alt_m": 13558.7
   },
   "member_spread_deg": {
    "lat": 49.1,
    "lon": 329.48
   },
   "member_spread_now_deg": {
    "lat": 0.38,
    "lon": 0.22
   },
   "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": 62.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 30.24194,
    "lon": 14.14652,
    "alt_m": 9184.3
   },
   "member_spread_deg": {
    "lat": 25.37,
    "lon": 176.24
   },
   "member_spread_now_deg": {
    "lat": 15.92,
    "lon": 26.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 133.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": 55.46271,
    "lon": -122.03999,
    "alt_m": 8662.3
   },
   "member_spread_deg": {
    "lat": 45.25,
    "lon": 334.73
   },
   "member_spread_now_deg": {
    "lat": 26.1,
    "lon": 51.92
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 45.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": 61.52325,
    "lon": -154.35277,
    "alt_m": 12006.2
   },
   "member_spread_deg": {
    "lat": 48.47,
    "lon": 88.09
   },
   "member_spread_now_deg": {
    "lat": 7.17,
    "lon": 38.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 45.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": 57.24349,
    "lon": -158.98182,
    "alt_m": 12292.8
   },
   "member_spread_deg": {
    "lat": 50.5,
    "lon": 90.38
   },
   "member_spread_now_deg": {
    "lat": 7.07,
    "lon": 39.47
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:53:00",
   "seed_lat": 66.625,
   "seed_lon": 23.70833,
   "seed_alt_m": 12370.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 05:00:00",
    "lat": 81.28216,
    "lon": -61.9586,
    "alt_m": 12312.1
   },
   "member_spread_deg": {
    "lat": 34.93,
    "lon": 291.81
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.49
   },
   "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": 161.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 67.1793,
    "lon": -102.74433,
    "alt_m": 15070.0
   },
   "member_spread_deg": {
    "lat": 33.36,
    "lon": 274.25
   },
   "member_spread_now_deg": {
    "lat": 13.17,
    "lon": 348.5
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 05:43:00",
   "seed_lat": 76.0625,
   "seed_lon": 95.45833,
   "seed_alt_m": 12560.0,
   "seed_age_h": 23.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 47.81756,
    "lon": -111.49757,
    "alt_m": 12983.4
   },
   "member_spread_deg": {
    "lat": 64.68,
    "lon": 86.94
   },
   "member_spread_now_deg": {
    "lat": 10.65,
    "lon": 9.74
   },
   "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": 185.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 29.7602,
    "lon": 157.37732,
    "alt_m": 14061.7
   },
   "member_spread_deg": {
    "lat": 67.31,
    "lon": 311.9
   },
   "member_spread_now_deg": {
    "lat": 32.36,
    "lon": 303.69
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 18:13:07",
   "seed_lat": 27.22911,
   "seed_lon": -21.79166,
   "seed_alt_m": 13480.0,
   "seed_age_h": 11.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 27.71612,
    "lon": 105.36833,
    "alt_m": 13305.4
   },
   "member_spread_deg": {
    "lat": 28.0,
    "lon": 120.1
   },
   "member_spread_now_deg": {
    "lat": 3.3,
    "lon": 3.95
   },
   "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": 94.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": 35.46243,
    "lon": 122.16091,
    "alt_m": 13026.3
   },
   "member_spread_deg": {
    "lat": 61.8,
    "lon": 302.49
   },
   "member_spread_now_deg": {
    "lat": 27.79,
    "lon": 342.45
   },
   "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": 271.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:30:00",
    "lat": -25.85494,
    "lon": 164.14182,
    "alt_m": 14323.3
   },
   "member_spread_deg": {
    "lat": 51.54,
    "lon": 309.48
   },
   "member_spread_now_deg": {
    "lat": 25.14,
    "lon": 285.6
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 01:22:33",
   "seed_lat": 72.60417,
   "seed_lon": -155.29167,
   "seed_alt_m": 13240.0,
   "seed_age_h": 3.96,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 01:00:00",
    "lat": 57.00603,
    "lon": -71.91223,
    "alt_m": 13436.8
   },
   "member_spread_deg": {
    "lat": 43.52,
    "lon": 129.62
   },
   "member_spread_now_deg": {
    "lat": 1.59,
    "lon": 3.02
   },
   "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": 68.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 69.71634,
    "lon": 76.84374,
    "alt_m": 12758.8
   },
   "member_spread_deg": {
    "lat": 31.38,
    "lon": 286.8
   },
   "member_spread_now_deg": {
    "lat": 21.64,
    "lon": 11.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 15:50:43",
   "seed_lat": 57.08328,
   "seed_lon": 7.00003,
   "seed_alt_m": 12720.0,
   "seed_age_h": 13.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:45:00",
    "lat": 71.86003,
    "lon": 150.50697,
    "alt_m": 12859.9
   },
   "member_spread_deg": {
    "lat": 35.59,
    "lon": 73.83
   },
   "member_spread_now_deg": {
    "lat": 1.01,
    "lon": 10.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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 ]
}