{
 "generated_utc": "2026-07-31T11:28:05Z",
 "gfs_cycle_utc": "2026-07-31T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.5,
  "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_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260731_06Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 257670
 },
 "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": 297.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 26.68264,
    "lon": -114.48556,
    "alt_m": 14335.5
   },
   "member_spread_deg": {
    "lat": 66.7,
    "lon": 120.89
   },
   "member_spread_now_deg": {
    "lat": 28.73,
    "lon": 57.59
   },
   "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": 8.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": -58.28119,
    "lon": 75.06788,
    "alt_m": 12727.5
   },
   "member_spread_deg": {
    "lat": 16.58,
    "lon": 107.6
   },
   "member_spread_now_deg": {
    "lat": 1.09,
    "lon": 3.59
   },
   "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": 161.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 49.65966,
    "lon": -61.82323,
    "alt_m": 13522.4
   },
   "member_spread_deg": {
    "lat": 61.35,
    "lon": 349.83
   },
   "member_spread_now_deg": {
    "lat": 15.23,
    "lon": 80.55
   },
   "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": 46.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 45.75404,
    "lon": -149.12531,
    "alt_m": 12938.7
   },
   "member_spread_deg": {
    "lat": 31.0,
    "lon": 323.87
   },
   "member_spread_now_deg": {
    "lat": 9.51,
    "lon": 17.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 11:01:48",
   "seed_lat": 43.97917,
   "seed_lon": -40.16667,
   "seed_alt_m": 14340.0,
   "seed_age_h": 0.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:00:00",
    "lat": 41.5915,
    "lon": 16.60949,
    "alt_m": 14313.1
   },
   "member_spread_deg": {
    "lat": 29.79,
    "lon": 62.31
   },
   "member_spread_now_deg": {
    "lat": 0.28,
    "lon": 0.47
   },
   "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": 8.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 32.28937,
    "lon": -161.53006,
    "alt_m": 12963.6
   },
   "member_spread_deg": {
    "lat": 57.02,
    "lon": 119.51
   },
   "member_spread_now_deg": {
    "lat": 1.92,
    "lon": 5.24
   },
   "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": 147.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 66.5226,
    "lon": -10.37271,
    "alt_m": 12847.3
   },
   "member_spread_deg": {
    "lat": 44.7,
    "lon": 204.02
   },
   "member_spread_now_deg": {
    "lat": 21.29,
    "lon": 89.4
   },
   "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 05:18:00",
   "seed_lat": 49.0625,
   "seed_lon": 176.45833,
   "seed_alt_m": 13560.0,
   "seed_age_h": 6.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 49.29255,
    "lon": -110.37666,
    "alt_m": 13605.1
   },
   "member_spread_deg": {
    "lat": 60.22,
    "lon": 355.96
   },
   "member_spread_now_deg": {
    "lat": 2.63,
    "lon": 5.39
   },
   "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": 7.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 63.15487,
    "lon": -160.29794,
    "alt_m": 12789.0
   },
   "member_spread_deg": {
    "lat": 39.04,
    "lon": 320.68
   },
   "member_spread_now_deg": {
    "lat": 1.7,
    "lon": 1.73
   },
   "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": 68.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 36.8531,
    "lon": 64.72234,
    "alt_m": 9059.8
   },
   "member_spread_deg": {
    "lat": 30.44,
    "lon": 216.83
   },
   "member_spread_now_deg": {
    "lat": 17.84,
    "lon": 29.56
   },
   "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": 139.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 55.73569,
    "lon": -104.43468,
    "alt_m": 8595.7
   },
   "member_spread_deg": {
    "lat": 41.79,
    "lon": 350.11
   },
   "member_spread_now_deg": {
    "lat": 27.72,
    "lon": 54.66
   },
   "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": 51.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 57.53324,
    "lon": -101.36345,
    "alt_m": 12168.2
   },
   "member_spread_deg": {
    "lat": 28.86,
    "lon": 111.01
   },
   "member_spread_now_deg": {
    "lat": 9.61,
    "lon": 34.76
   },
   "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": 51.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 64.72151,
    "lon": -170.37999,
    "alt_m": 12335.9
   },
   "member_spread_deg": {
    "lat": 32.19,
    "lon": 72.0
   },
   "member_spread_now_deg": {
    "lat": 9.81,
    "lon": 35.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 05:28:00",
   "seed_lat": 66.8125,
   "seed_lon": 24.20833,
   "seed_alt_m": 12380.0,
   "seed_age_h": 5.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 67.52542,
    "lon": 150.29003,
    "alt_m": 12178.2
   },
   "member_spread_deg": {
    "lat": 36.56,
    "lon": 207.65
   },
   "member_spread_now_deg": {
    "lat": 0.6,
    "lon": 5.95
   },
   "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": 167.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 56.38184,
    "lon": -105.28693,
    "alt_m": 15230.1
   },
   "member_spread_deg": {
    "lat": 33.02,
    "lon": 123.05
   },
   "member_spread_now_deg": {
    "lat": 15.24,
    "lon": 347.86
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 08:03:00",
   "seed_lat": 64.1875,
   "seed_lon": 136.58333,
   "seed_alt_m": 12790.0,
   "seed_age_h": 3.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 07:30:00",
    "lat": 52.80087,
    "lon": -75.76192,
    "alt_m": 12890.8
   },
   "member_spread_deg": {
    "lat": 28.62,
    "lon": 93.93
   },
   "member_spread_now_deg": {
    "lat": 0.98,
    "lon": 0.35
   },
   "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": 191.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 30.0209,
    "lon": 155.99355,
    "alt_m": 14112.7
   },
   "member_spread_deg": {
    "lat": 53.73,
    "lon": 337.28
   },
   "member_spread_now_deg": {
    "lat": 36.15,
    "lon": 303.14
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 10:55:37",
   "seed_lat": 29.60411,
   "seed_lon": -16.5,
   "seed_alt_m": 13450.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:00:00",
    "lat": 54.24259,
    "lon": 113.05378,
    "alt_m": 13262.3
   },
   "member_spread_deg": {
    "lat": 15.95,
    "lon": 31.56
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.18
   },
   "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": 100.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": 42.20828,
    "lon": -177.89159,
    "alt_m": 13141.7
   },
   "member_spread_deg": {
    "lat": 68.9,
    "lon": 356.02
   },
   "member_spread_now_deg": {
    "lat": 28.73,
    "lon": 341.33
   },
   "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": 277.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:30:00",
    "lat": -26.31818,
    "lon": 175.88816,
    "alt_m": 14363.3
   },
   "member_spread_deg": {
    "lat": 48.34,
    "lon": 310.9
   },
   "member_spread_now_deg": {
    "lat": 29.27,
    "lon": 288.0
   },
   "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 10:57:03",
   "seed_lat": 71.64583,
   "seed_lon": -147.95833,
   "seed_alt_m": 13210.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:00:00",
    "lat": 59.06592,
    "lon": -50.45185,
    "alt_m": 13424.8
   },
   "member_spread_deg": {
    "lat": 20.97,
    "lon": 85.42
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.3
   },
   "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": 74.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 05:45:00",
    "lat": 68.547,
    "lon": 109.54578,
    "alt_m": 13086.6
   },
   "member_spread_deg": {
    "lat": 23.41,
    "lon": 328.62
   },
   "member_spread_now_deg": {
    "lat": 20.25,
    "lon": 15.16
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 1.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 09:15:00",
    "lat": 72.49978,
    "lon": 166.42302,
    "alt_m": 12608.3
   },
   "member_spread_deg": {
    "lat": 36.59,
    "lon": 337.17
   },
   "member_spread_now_deg": {
    "lat": 0.31,
    "lon": 1.88
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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 ]
}