{
 "generated_utc": "2026-07-30T11:28:18Z",
 "gfs_cycle_utc": "2026-07-30T06:00:00Z",
 "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_20260730_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260730_06Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 261324
 },
 "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": 323.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 44.90353,
    "lon": 92.60076,
    "alt_m": 12027.6
   },
   "member_spread_deg": {
    "lat": 68.75,
    "lon": 251.99
   },
   "member_spread_now_deg": {
    "lat": 78.28,
    "lon": 316.07
   },
   "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": 273.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 33.49932,
    "lon": -96.7444,
    "alt_m": 14265.9
   },
   "member_spread_deg": {
    "lat": 60.97,
    "lon": 120.95
   },
   "member_spread_now_deg": {
    "lat": 35.15,
    "lon": 50.07
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:28:40",
   "seed_lat": -63.27084,
   "seed_lon": 131.16668,
   "seed_alt_m": 12240.0,
   "seed_age_h": 6.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": -52.84254,
    "lon": 39.51397,
    "alt_m": 12419.3
   },
   "member_spread_deg": {
    "lat": 13.57,
    "lon": 92.65
   },
   "member_spread_now_deg": {
    "lat": 2.06,
    "lon": 3.06
   },
   "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": 137.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 49.39219,
    "lon": -81.05211,
    "alt_m": 13220.6
   },
   "member_spread_deg": {
    "lat": 33.13,
    "lon": 343.53
   },
   "member_spread_now_deg": {
    "lat": 21.75,
    "lon": 72.27
   },
   "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": 22.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 84.46601,
    "lon": -21.40148,
    "alt_m": 12470.0
   },
   "member_spread_deg": {
    "lat": 35.96,
    "lon": 299.54
   },
   "member_spread_now_deg": {
    "lat": 3.45,
    "lon": 3.36
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 21:52:33",
   "seed_lat": 37.5,
   "seed_lon": -74.0,
   "seed_alt_m": 14050.0,
   "seed_age_h": 13.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 40.22474,
    "lon": -8.99065,
    "alt_m": 14168.1
   },
   "member_spread_deg": {
    "lat": 25.28,
    "lon": 156.09
   },
   "member_spread_now_deg": {
    "lat": 7.64,
    "lon": 6.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 02:49:00",
   "seed_lat": 29.64583,
   "seed_lon": -162.625,
   "seed_alt_m": 13040.0,
   "seed_age_h": 8.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 49.40518,
    "lon": -70.13525,
    "alt_m": 13015.5
   },
   "member_spread_deg": {
    "lat": 35.36,
    "lon": 337.04
   },
   "member_spread_now_deg": {
    "lat": 0.88,
    "lon": 2.48
   },
   "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": 123.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 75.35741,
    "lon": -78.99313,
    "alt_m": 12571.6
   },
   "member_spread_deg": {
    "lat": 39.92,
    "lon": 228.78
   },
   "member_spread_now_deg": {
    "lat": 26.49,
    "lon": 327.29
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 05:58:00",
   "seed_lat": 50.35417,
   "seed_lon": 151.79167,
   "seed_alt_m": 13390.0,
   "seed_age_h": 5.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 43.90819,
    "lon": -140.72532,
    "alt_m": 13745.6
   },
   "member_spread_deg": {
    "lat": 31.54,
    "lon": 328.28
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 2.08
   },
   "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": 44.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 53.26758,
    "lon": 75.32867,
    "alt_m": 9270.2
   },
   "member_spread_deg": {
    "lat": 26.17,
    "lon": 193.29
   },
   "member_spread_now_deg": {
    "lat": 8.3,
    "lon": 25.06
   },
   "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": 115.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 43.44954,
    "lon": -167.2161,
    "alt_m": 8648.7
   },
   "member_spread_deg": {
    "lat": 33.72,
    "lon": 343.65
   },
   "member_spread_now_deg": {
    "lat": 25.96,
    "lon": 41.88
   },
   "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": 27.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 54.97267,
    "lon": -164.0602,
    "alt_m": 12171.5
   },
   "member_spread_deg": {
    "lat": 47.83,
    "lon": 35.22
   },
   "member_spread_now_deg": {
    "lat": 5.81,
    "lon": 9.21
   },
   "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": 27.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 54.39179,
    "lon": -163.93919,
    "alt_m": 12171.2
   },
   "member_spread_deg": {
    "lat": 44.67,
    "lon": 47.37
   },
   "member_spread_now_deg": {
    "lat": 5.79,
    "lon": 9.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 10:53:00",
   "seed_lat": 56.04167,
   "seed_lon": 0.25,
   "seed_alt_m": 12270.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 11:00:00",
    "lat": 60.07732,
    "lon": -110.14916,
    "alt_m": 12394.7
   },
   "member_spread_deg": {
    "lat": 30.05,
    "lon": 252.53
   },
   "member_spread_now_deg": {
    "lat": 0.27,
    "lon": 0.35
   },
   "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": 143.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 83.28402,
    "lon": 40.01458,
    "alt_m": 14809.0
   },
   "member_spread_deg": {
    "lat": 30.7,
    "lon": 321.05
   },
   "member_spread_now_deg": {
    "lat": 7.48,
    "lon": 303.44
   },
   "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": 5.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 48.25363,
    "lon": -94.94554,
    "alt_m": 12964.8
   },
   "member_spread_deg": {
    "lat": 37.48,
    "lon": 75.29
   },
   "member_spread_now_deg": {
    "lat": 3.08,
    "lon": 13.71
   },
   "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": 167.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 36.20298,
    "lon": 165.49124,
    "alt_m": 14126.9
   },
   "member_spread_deg": {
    "lat": 45.51,
    "lon": 352.93
   },
   "member_spread_now_deg": {
    "lat": 15.73,
    "lon": 298.22
   },
   "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 10:35:37",
   "seed_lat": 27.20828,
   "seed_lon": -23.16667,
   "seed_alt_m": 13465.0,
   "seed_age_h": 0.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 10:00:00",
    "lat": 30.3453,
    "lon": 104.78631,
    "alt_m": 13234.1
   },
   "member_spread_deg": {
    "lat": 22.73,
    "lon": 126.69
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.17
   },
   "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": 76.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": 34.34335,
    "lon": 121.60723,
    "alt_m": 13092.0
   },
   "member_spread_deg": {
    "lat": 74.39,
    "lon": 288.43
   },
   "member_spread_now_deg": {
    "lat": 26.74,
    "lon": 64.48
   },
   "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": 253.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:30:00",
    "lat": -28.81322,
    "lon": 139.53692,
    "alt_m": 14432.2
   },
   "member_spread_deg": {
    "lat": 54.61,
    "lon": 300.58
   },
   "member_spread_now_deg": {
    "lat": 23.45,
    "lon": 276.72
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 10:57:03",
   "seed_lat": 72.60417,
   "seed_lon": -173.33333,
   "seed_alt_m": 13120.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:00:00",
    "lat": 55.21061,
    "lon": -88.87171,
    "alt_m": 13240.0
   },
   "member_spread_deg": {
    "lat": 34.1,
    "lon": 341.37
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.79
   },
   "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": 50.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:45:00",
    "lat": 65.70367,
    "lon": 84.82502,
    "alt_m": 12832.6
   },
   "member_spread_deg": {
    "lat": 10.59,
    "lon": 246.11
   },
   "member_spread_now_deg": {
    "lat": 20.14,
    "lon": 5.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 10:55:43",
   "seed_lat": 53.95828,
   "seed_lon": 0.50003,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:00:00",
    "lat": 72.35209,
    "lon": 125.05643,
    "alt_m": 12984.8
   },
   "member_spread_deg": {
    "lat": 18.71,
    "lon": 82.93
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.23
   },
   "display_as": "track",
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 ]
}