{
 "generated_utc": "2026-08-01T05:27:57Z",
 "gfs_cycle_utc": "2026-08-01T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 494.5,
  "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_20260801_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260801_00Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 252315
 },
 "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": 315.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 29.60068,
    "lon": -139.58547,
    "alt_m": 14253.0
   },
   "member_spread_deg": {
    "lat": 55.72,
    "lon": 198.83
   },
   "member_spread_now_deg": {
    "lat": 35.6,
    "lon": 59.8
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 4.94,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 00:00:00",
    "lat": -43.6958,
    "lon": 114.61,
    "alt_m": 12313.7
   },
   "member_spread_deg": {
    "lat": 13.74,
    "lon": 38.18
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 1.19
   },
   "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": 179.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 49.45387,
    "lon": -77.8967,
    "alt_m": 13192.3
   },
   "member_spread_deg": {
    "lat": 51.86,
    "lon": 148.56
   },
   "member_spread_now_deg": {
    "lat": 27.0,
    "lon": 88.06
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 04:59:18",
   "seed_lat": 63.8125,
   "seed_lon": 65.58333,
   "seed_alt_m": 12690.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 05:00:00",
    "lat": 58.08552,
    "lon": -61.82453,
    "alt_m": 12803.7
   },
   "member_spread_deg": {
    "lat": 23.36,
    "lon": 307.18
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 0.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:16:18",
   "seed_lat": 39.22917,
   "seed_lon": -35.625,
   "seed_alt_m": 14540.0,
   "seed_age_h": 11.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 47.25574,
    "lon": 71.93564,
    "alt_m": 14044.0
   },
   "member_spread_deg": {
    "lat": 20.8,
    "lon": 62.92
   },
   "member_spread_now_deg": {
    "lat": 4.17,
    "lon": 2.15
   },
   "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": 1.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 03:15:00",
    "lat": 42.21751,
    "lon": -53.35535,
    "alt_m": 13046.3
   },
   "member_spread_deg": {
    "lat": 19.57,
    "lon": 107.79
   },
   "member_spread_now_deg": {
    "lat": 0.27,
    "lon": 0.27
   },
   "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": 165.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 69.17525,
    "lon": -41.83734,
    "alt_m": 12713.4
   },
   "member_spread_deg": {
    "lat": 32.07,
    "lon": 187.17
   },
   "member_spread_now_deg": {
    "lat": 22.04,
    "lon": 98.87
   },
   "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 04:23:00",
   "seed_lat": 32.66667,
   "seed_lon": 174.41667,
   "seed_alt_m": 13960.0,
   "seed_age_h": 0.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-08 04:00:00",
    "lat": 37.25467,
    "lon": -41.07985,
    "alt_m": 13729.8
   },
   "member_spread_deg": {
    "lat": 52.16,
    "lon": 353.44
   },
   "member_spread_now_deg": {
    "lat": 0.35,
    "lon": 0.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 04:22:00",
   "seed_lat": 42.08333,
   "seed_lon": 96.79167,
   "seed_alt_m": 13010.0,
   "seed_age_h": 0.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 03:45:00",
    "lat": 57.51636,
    "lon": -120.37464,
    "alt_m": 13147.5
   },
   "member_spread_deg": {
    "lat": 41.66,
    "lon": 319.87
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.34
   },
   "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": 86.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 17.13989,
    "lon": -3.64435,
    "alt_m": 9249.2
   },
   "member_spread_deg": {
    "lat": 41.09,
    "lon": 201.85
   },
   "member_spread_now_deg": {
    "lat": 18.65,
    "lon": 43.43
   },
   "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": 157.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 51.39641,
    "lon": -117.72762,
    "alt_m": 8664.9
   },
   "member_spread_deg": {
    "lat": 33.08,
    "lon": 326.55
   },
   "member_spread_now_deg": {
    "lat": 29.43,
    "lon": 64.72
   },
   "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": 69.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 60.52063,
    "lon": -30.55755,
    "alt_m": 12300.6
   },
   "member_spread_deg": {
    "lat": 56.82,
    "lon": 128.23
   },
   "member_spread_now_deg": {
    "lat": 15.28,
    "lon": 31.51
   },
   "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": 69.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 59.55667,
    "lon": -29.99433,
    "alt_m": 12380.0
   },
   "member_spread_deg": {
    "lat": 53.54,
    "lon": 126.66
   },
   "member_spread_now_deg": {
    "lat": 15.79,
    "lon": 31.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 04:53:00",
   "seed_lat": 68.47917,
   "seed_lon": 49.75,
   "seed_alt_m": 12360.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-08 05:00:00",
    "lat": 66.26824,
    "lon": 54.80634,
    "alt_m": 11786.0
   },
   "member_spread_deg": {
    "lat": 55.52,
    "lon": 331.17
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.13
   },
   "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": 185.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 75.33419,
    "lon": -92.65697,
    "alt_m": 15110.6
   },
   "member_spread_deg": {
    "lat": 30.6,
    "lon": 309.16
   },
   "member_spread_now_deg": {
    "lat": 21.87,
    "lon": 355.71
   },
   "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 21:33:00",
   "seed_lat": 59.875,
   "seed_lon": 143.95833,
   "seed_alt_m": 12840.0,
   "seed_age_h": 7.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 60.97662,
    "lon": -50.34102,
    "alt_m": 12728.4
   },
   "member_spread_deg": {
    "lat": 32.31,
    "lon": 100.4
   },
   "member_spread_now_deg": {
    "lat": 1.79,
    "lon": 3.28
   },
   "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": 209.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 31.05002,
    "lon": 149.24052,
    "alt_m": 14040.7
   },
   "member_spread_deg": {
    "lat": 58.55,
    "lon": 349.89
   },
   "member_spread_now_deg": {
    "lat": 42.57,
    "lon": 286.98
   },
   "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 16:35:37",
   "seed_lat": 31.33328,
   "seed_lon": -13.375,
   "seed_alt_m": 13390.0,
   "seed_age_h": 12.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 50.66279,
    "lon": 147.69864,
    "alt_m": 12950.3
   },
   "member_spread_deg": {
    "lat": 19.5,
    "lon": 55.1
   },
   "member_spread_now_deg": {
    "lat": 1.39,
    "lon": 2.88
   },
   "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": 118.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": 50.58276,
    "lon": 153.91314,
    "alt_m": 13032.6
   },
   "member_spread_deg": {
    "lat": 72.27,
    "lon": 320.26
   },
   "member_spread_now_deg": {
    "lat": 31.02,
    "lon": 75.12
   },
   "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": 295.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:30:00",
    "lat": -34.3982,
    "lon": -118.23919,
    "alt_m": 14506.9
   },
   "member_spread_deg": {
    "lat": 51.75,
    "lon": 189.88
   },
   "member_spread_now_deg": {
    "lat": 29.5,
    "lon": 305.32
   },
   "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 04:40:33",
   "seed_lat": 69.41667,
   "seed_lon": -139.08333,
   "seed_alt_m": 13230.0,
   "seed_age_h": 0.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-08 04:15:00",
    "lat": 63.32711,
    "lon": -58.22459,
    "alt_m": 13185.9
   },
   "member_spread_deg": {
    "lat": 18.44,
    "lon": 136.07
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.36
   },
   "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": 92.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 83.62286,
    "lon": 98.64553,
    "alt_m": 12439.9
   },
   "member_spread_deg": {
    "lat": 31.95,
    "lon": 275.12
   },
   "member_spread_now_deg": {
    "lat": 20.75,
    "lon": 43.08
   },
   "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": 19.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:45:00",
    "lat": 73.4209,
    "lon": 152.723,
    "alt_m": 12776.9
   },
   "member_spread_deg": {
    "lat": 32.9,
    "lon": 322.73
   },
   "member_spread_now_deg": {
    "lat": 10.16,
    "lon": 5.99
   },
   "display_as": "track",
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   "member_spread_deg": {
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    "lon": 246.68
   },
   "member_spread_now_deg": {
    "lat": 14.36,
    "lon": 327.79
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}