{
 "generated_utc": "2026-07-31T17:28:14Z",
 "gfs_cycle_utc": "2026-07-31T12:00:00Z",
 "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_20260731_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260731_12Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 261711
 },
 "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": 303.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 26.66231,
    "lon": -104.89504,
    "alt_m": 14199.4
   },
   "member_spread_deg": {
    "lat": 53.86,
    "lon": 104.75
   },
   "member_spread_now_deg": {
    "lat": 29.7,
    "lon": 58.07
   },
   "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": 14.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": -54.50636,
    "lon": 82.88394,
    "alt_m": 12767.7
   },
   "member_spread_deg": {
    "lat": 16.82,
    "lon": 114.64
   },
   "member_spread_now_deg": {
    "lat": 2.47,
    "lon": 3.87
   },
   "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": 167.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 57.6892,
    "lon": -60.22491,
    "alt_m": 13273.2
   },
   "member_spread_deg": {
    "lat": 72.61,
    "lon": 172.15
   },
   "member_spread_now_deg": {
    "lat": 18.18,
    "lon": 81.59
   },
   "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": 52.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 65.29701,
    "lon": -159.03837,
    "alt_m": 12918.5
   },
   "member_spread_deg": {
    "lat": 51.3,
    "lon": 350.69
   },
   "member_spread_now_deg": {
    "lat": 11.27,
    "lon": 15.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 17:00:19",
   "seed_lat": 40.0,
   "seed_lon": -36.33333,
   "seed_alt_m": 14490.0,
   "seed_age_h": 0.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:00:00",
    "lat": 46.00345,
    "lon": 52.48341,
    "alt_m": 14203.7
   },
   "member_spread_deg": {
    "lat": 23.13,
    "lon": 78.32
   },
   "member_spread_now_deg": {
    "lat": 0.3,
    "lon": 0.3
   },
   "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": 14.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 27.35285,
    "lon": -161.81162,
    "alt_m": 12841.2
   },
   "member_spread_deg": {
    "lat": 35.32,
    "lon": 123.43
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 8.85
   },
   "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": 153.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 60.83396,
    "lon": 15.34184,
    "alt_m": 12720.7
   },
   "member_spread_deg": {
    "lat": 22.73,
    "lon": 237.76
   },
   "member_spread_now_deg": {
    "lat": 20.26,
    "lon": 92.6
   },
   "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": 12.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 43.3465,
    "lon": -107.13369,
    "alt_m": 13632.0
   },
   "member_spread_deg": {
    "lat": 51.3,
    "lon": 337.17
   },
   "member_spread_now_deg": {
    "lat": 3.5,
    "lon": 6.46
   },
   "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": 13.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 34.63187,
    "lon": -141.56096,
    "alt_m": 13520.3
   },
   "member_spread_deg": {
    "lat": 39.94,
    "lon": 326.96
   },
   "member_spread_now_deg": {
    "lat": 3.18,
    "lon": 3.74
   },
   "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": 74.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 39.76889,
    "lon": 39.14125,
    "alt_m": 9085.0
   },
   "member_spread_deg": {
    "lat": 43.04,
    "lon": 210.81
   },
   "member_spread_now_deg": {
    "lat": 18.72,
    "lon": 31.72
   },
   "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": 145.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 84.51151,
    "lon": -60.45728,
    "alt_m": 8649.3
   },
   "member_spread_deg": {
    "lat": 47.81,
    "lon": 349.64
   },
   "member_spread_now_deg": {
    "lat": 29.11,
    "lon": 57.2
   },
   "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": 57.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 80.4313,
    "lon": -33.44166,
    "alt_m": 12157.1
   },
   "member_spread_deg": {
    "lat": 65.04,
    "lon": 170.59
   },
   "member_spread_now_deg": {
    "lat": 11.02,
    "lon": 31.11
   },
   "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": 57.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 52.82007,
    "lon": -72.43695,
    "alt_m": 12313.2
   },
   "member_spread_deg": {
    "lat": 64.09,
    "lon": 156.66
   },
   "member_spread_now_deg": {
    "lat": 11.19,
    "lon": 31.33
   },
   "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": 11.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 85.92131,
    "lon": -148.11849,
    "alt_m": 11952.7
   },
   "member_spread_deg": {
    "lat": 37.78,
    "lon": 303.84
   },
   "member_spread_now_deg": {
    "lat": 2.83,
    "lon": 9.6
   },
   "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": 173.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 68.82451,
    "lon": -114.38291,
    "alt_m": 15295.9
   },
   "member_spread_deg": {
    "lat": 35.68,
    "lon": 295.84
   },
   "member_spread_now_deg": {
    "lat": 17.5,
    "lon": 358.51
   },
   "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": 9.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 53.45222,
    "lon": -169.13069,
    "alt_m": 12952.7
   },
   "member_spread_deg": {
    "lat": 60.69,
    "lon": 160.71
   },
   "member_spread_now_deg": {
    "lat": 2.17,
    "lon": 1.93
   },
   "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": 197.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 48.37911,
    "lon": -140.78026,
    "alt_m": 13665.0
   },
   "member_spread_deg": {
    "lat": 57.79,
    "lon": 334.22
   },
   "member_spread_now_deg": {
    "lat": 38.77,
    "lon": 299.69
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 16:35:37",
   "seed_lat": 31.33328,
   "seed_lon": -13.375,
   "seed_alt_m": 13390.0,
   "seed_age_h": 0.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 16:00:00",
    "lat": 53.97181,
    "lon": 118.21395,
    "alt_m": 13211.8
   },
   "member_spread_deg": {
    "lat": 20.61,
    "lon": 31.65
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.13
   },
   "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": 106.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": 30.53397,
    "lon": 119.24964,
    "alt_m": 12997.5
   },
   "member_spread_deg": {
    "lat": 75.86,
    "lon": 309.7
   },
   "member_spread_now_deg": {
    "lat": 29.19,
    "lon": 343.02
   },
   "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": 283.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:30:00",
    "lat": -27.26767,
    "lon": -156.18117,
    "alt_m": 14319.6
   },
   "member_spread_deg": {
    "lat": 42.18,
    "lon": 237.63
   },
   "member_spread_now_deg": {
    "lat": 31.9,
    "lon": 291.87
   },
   "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 16:33:48",
   "seed_lat": 71.02083,
   "seed_lon": -144.875,
   "seed_alt_m": 13260.0,
   "seed_age_h": 0.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 16:00:00",
    "lat": 63.4444,
    "lon": -63.59297,
    "alt_m": 13232.9
   },
   "member_spread_deg": {
    "lat": 14.49,
    "lon": 127.88
   },
   "member_spread_now_deg": {
    "lat": 0.39,
    "lon": 0.56
   },
   "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": 80.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 74.16666,
    "lon": 67.34184,
    "alt_m": 12656.4
   },
   "member_spread_deg": {
    "lat": 17.34,
    "lon": 305.96
   },
   "member_spread_now_deg": {
    "lat": 18.17,
    "lon": 18.75
   },
   "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": 7.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 11:45:00",
    "lat": 66.91468,
    "lon": 155.12579,
    "alt_m": 12605.6
   },
   "member_spread_deg": {
    "lat": 23.07,
    "lon": 339.75
   },
   "member_spread_now_deg": {
    "lat": 2.49,
    "lon": 6.11
   },
   "display_as": "track",
   "display_reason": "fresh"
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 ]
}