{
 "generated_utc": "2026-07-28T23:28:20Z",
 "gfs_cycle_utc": "2026-07-28T18:00:00Z",
 "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_20260728_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260728_18Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 262368
 },
 "flights": [
  {
   "callsign": "9A1CTF-16",
   "flight_id": "9A1CTF-16_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 23:22:00",
   "seed_lat": 22.83333,
   "seed_lon": 138.79167,
   "seed_alt_m": 12180.0,
   "seed_age_h": 287.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 19.11922,
    "lon": -28.50923,
    "alt_m": 12299.0
   },
   "member_spread_deg": {
    "lat": 77.3,
    "lon": 302.16
   },
   "member_spread_now_deg": {
    "lat": 76.63,
    "lon": 321.19
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "9A1CTF-18",
   "flight_id": "9A1CTF-18_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 08:00:00",
   "seed_lat": 26.92359,
   "seed_lon": 141.2035,
   "seed_alt_m": 12930.0,
   "seed_age_h": 303.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 17.88294,
    "lon": -23.65672,
    "alt_m": 13052.4
   },
   "member_spread_deg": {
    "lat": 47.76,
    "lon": 250.98
   },
   "member_spread_now_deg": {
    "lat": 43.89,
    "lon": 208.6
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 237.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 39.02886,
    "lon": -127.53944,
    "alt_m": 14251.0
   },
   "member_spread_deg": {
    "lat": 45.73,
    "lon": 92.43
   },
   "member_spread_now_deg": {
    "lat": 43.02,
    "lon": 46.37
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 12:33:40",
   "seed_lat": -53.39584,
   "seed_lon": 48.16668,
   "seed_alt_m": 12420.0,
   "seed_age_h": 10.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": -50.61786,
    "lon": -48.27051,
    "alt_m": 12803.8
   },
   "member_spread_deg": {
    "lat": 16.41,
    "lon": 178.28
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 5.91
   },
   "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": 101.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 43.72901,
    "lon": -107.38683,
    "alt_m": 13413.8
   },
   "member_spread_deg": {
    "lat": 39.4,
    "lon": 334.95
   },
   "member_spread_now_deg": {
    "lat": 24.54,
    "lon": 66.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 19:34:18",
   "seed_lat": 52.58333,
   "seed_lon": -8.08333,
   "seed_alt_m": 12780.0,
   "seed_age_h": 3.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 19:00:00",
    "lat": 58.98865,
    "lon": 92.95332,
    "alt_m": 12869.4
   },
   "member_spread_deg": {
    "lat": 9.8,
    "lon": 289.13
   },
   "member_spread_now_deg": {
    "lat": 0.82,
    "lon": 0.94
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 22:53:19",
   "seed_lat": 47.72917,
   "seed_lon": -91.33333,
   "seed_alt_m": 14080.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-04 23:00:00",
    "lat": 32.48592,
    "lon": -34.91387,
    "alt_m": 14506.1
   },
   "member_spread_deg": {
    "lat": 33.56,
    "lon": 232.21
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 21:34:00",
   "seed_lat": 36.41667,
   "seed_lon": -161.79167,
   "seed_alt_m": 13030.0,
   "seed_age_h": 1.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 21:00:00",
    "lat": 41.57822,
    "lon": -145.60693,
    "alt_m": 12737.1
   },
   "member_spread_deg": {
    "lat": 28.39,
    "lon": 339.48
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 1.53
   },
   "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": 87.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 83.46969,
    "lon": 111.68661,
    "alt_m": 12579.6
   },
   "member_spread_deg": {
    "lat": 39.37,
    "lon": 189.43
   },
   "member_spread_now_deg": {
    "lat": 20.86,
    "lon": 342.11
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 07:28:00",
   "seed_lat": 55.9375,
   "seed_lon": 130.41667,
   "seed_alt_m": 13230.0,
   "seed_age_h": 15.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 47.28085,
    "lon": -69.18073,
    "alt_m": 13199.3
   },
   "member_spread_deg": {
    "lat": 67.63,
    "lon": 350.23
   },
   "member_spread_now_deg": {
    "lat": 7.12,
    "lon": 4.59
   },
   "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": 8.65,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 37.01985,
    "lon": 22.34119,
    "alt_m": 9067.0
   },
   "member_spread_deg": {
    "lat": 50.41,
    "lon": 110.62
   },
   "member_spread_now_deg": {
    "lat": 2.08,
    "lon": 1.3
   },
   "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": 79.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 30.71608,
    "lon": -167.34063,
    "alt_m": 8602.5
   },
   "member_spread_deg": {
    "lat": 41.0,
    "lon": 353.44
   },
   "member_spread_now_deg": {
    "lat": 26.43,
    "lon": 15.62
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:01",
   "seed_lat": 49.625,
   "seed_lon": 25.08333,
   "seed_alt_m": 12400.0,
   "seed_age_h": 55.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 54.12686,
    "lon": -114.2177,
    "alt_m": 12472.5
   },
   "member_spread_deg": {
    "lat": 39.21,
    "lon": 351.77
   },
   "member_spread_now_deg": {
    "lat": 5.59,
    "lon": 15.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:02",
   "seed_lat": 49.63134,
   "seed_lon": 25.11007,
   "seed_alt_m": 12400.0,
   "seed_age_h": 55.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 57.17949,
    "lon": -120.87303,
    "alt_m": 12436.6
   },
   "member_spread_deg": {
    "lat": 30.14,
    "lon": 346.88
   },
   "member_spread_now_deg": {
    "lat": 4.86,
    "lon": 16.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 20:23:00",
   "seed_lat": 56.22917,
   "seed_lon": -36.875,
   "seed_alt_m": 12440.0,
   "seed_age_h": 2.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 20:00:00",
    "lat": 62.45624,
    "lon": 144.48996,
    "alt_m": 12299.1
   },
   "member_spread_deg": {
    "lat": 33.72,
    "lon": 320.35
   },
   "member_spread_now_deg": {
    "lat": 0.66,
    "lon": 0.66
   },
   "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": 107.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 84.87917,
    "lon": -88.68903,
    "alt_m": 14719.5
   },
   "member_spread_deg": {
    "lat": 45.2,
    "lon": 277.85
   },
   "member_spread_now_deg": {
    "lat": 7.78,
    "lon": 310.61
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 08:23:00",
   "seed_lat": 66.16667,
   "seed_lon": 33.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 14.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": 43.09897,
    "lon": -104.58931,
    "alt_m": 13263.6
   },
   "member_spread_deg": {
    "lat": 33.99,
    "lon": 92.17
   },
   "member_spread_now_deg": {
    "lat": 1.97,
    "lon": 2.43
   },
   "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": 131.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 60.52359,
    "lon": 158.03253,
    "alt_m": 13547.1
   },
   "member_spread_deg": {
    "lat": 39.07,
    "lon": 341.6
   },
   "member_spread_now_deg": {
    "lat": 22.13,
    "lon": 273.94
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 19:05:37",
   "seed_lat": 48.83328,
   "seed_lon": -42.83333,
   "seed_alt_m": 13180.0,
   "seed_age_h": 4.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 18:30:00",
    "lat": 45.47836,
    "lon": 109.60976,
    "alt_m": 12989.2
   },
   "member_spread_deg": {
    "lat": 34.93,
    "lon": 191.94
   },
   "member_spread_now_deg": {
    "lat": 2.37,
    "lon": 4.87
   },
   "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": 40.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": -26.11599,
    "lon": 106.34954,
    "alt_m": 12948.5
   },
   "member_spread_deg": {
    "lat": 73.05,
    "lon": 269.72
   },
   "member_spread_now_deg": {
    "lat": 9.47,
    "lon": 23.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 217.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:30:00",
    "lat": -27.48096,
    "lon": 97.92625,
    "alt_m": 14394.2
   },
   "member_spread_deg": {
    "lat": 28.83,
    "lon": 270.15
   },
   "member_spread_now_deg": {
    "lat": 12.0,
    "lon": 305.8
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 22:09:03",
   "seed_lat": 73.35417,
   "seed_lon": 143.54167,
   "seed_alt_m": 13120.0,
   "seed_age_h": 1.18,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 21:45:00",
    "lat": 74.88179,
    "lon": -76.75653,
    "alt_m": 13269.7
   },
   "member_spread_deg": {
    "lat": 41.67,
    "lon": 217.94
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.29
   },
   "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": 14.2,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": 52.025,
    "lon": 75.23022,
    "alt_m": 12842.7
   },
   "member_spread_deg": {
    "lat": 17.29,
    "lon": 190.08
   },
   "member_spread_now_deg": {
    "lat": 2.72,
    "lon": 4.44
   },
   "display_as": "track",
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  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-14 23:39:00",
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   "seed_lon": -136.75,
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   "float_reliable": true,
   "dead_reckoned": true,
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   },
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   },
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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   "seed_lon": 8.375,
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   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:45:00",
    "lat": -20.18475,
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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   "display_as": "track",
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  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
   "payload_type": "WSPR",
   "seed_time": "2026-07-20 01:53:00",
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   "seed_lon": -151.29167,
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   "seed_age_h": 213.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": -40.89226,
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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    "lon": 124.74
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   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}