{
  "name": "US Aurora Visibility Threshold Reference",
  "version": "2026-08-09",
  "date_modified": "2026-08-09",
  "description": "Model-derived Kp planning thresholds for tracked US cities. These are not aurora observations, forecasts, sightings, or accuracy measurements.",
  "methodology": {
    "threshold_model": "Threshold bands are derived from each stored city magnetic latitude with calculateKpBands(). The model assigns horizon, noticeable, and bright thresholds in discrete Kp bands from 1 to 9.",
    "interpretation": "A threshold is a planning reference only. Actual visibility also depends on current geomagnetic conditions, local darkness, cloud cover, moonlight, observer location, and other conditions.",
    "sources": [
      "https://www.swpc.noaa.gov/content/tips-viewing-aurora",
      "https://www.swpc.noaa.gov/content/aurora-tutorial",
      "https://aurora-forecast-usa.com/methodology"
    ]
  },
  "columns": [
    "city",
    "state",
    "city_slug",
    "latitude_degrees",
    "longitude_degrees",
    "magnetic_latitude_degrees",
    "timezone",
    "kp_horizon_threshold",
    "kp_noticeable_threshold",
    "kp_bright_threshold"
  ],
  "rows": [
    {
      "city": "Adak",
      "state": "Alaska",
      "city_slug": "adak",
      "latitude_degrees": 51.909889,
      "longitude_degrees": -176.598067,
      "magnetic_latitude_degrees": 48.8,
      "timezone": "America/Adak",
      "kp_horizon_threshold": 8,
      "kp_noticeable_threshold": 9,
      "kp_bright_threshold": 9
    },
    {
      "city": "Akhiok",
      "state": "Alaska",
      "city_slug": "akhiok",
      "latitude_degrees": 56.948329,
      "longitude_degrees": -154.215306,
      "magnetic_latitude_degrees": 57.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Akiachak",
      "state": "Alaska",
      "city_slug": "akiachak",
      "latitude_degrees": 60.920984,
      "longitude_degrees": -161.402087,
      "magnetic_latitude_degrees": 59.8,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Akiak",
      "state": "Alaska",
      "city_slug": "akiak",
      "latitude_degrees": 60.909445,
      "longitude_degrees": -161.216002,
      "magnetic_latitude_degrees": 59.8,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Akutan",
      "state": "Alaska",
      "city_slug": "akutan",
      "latitude_degrees": 54.139979,
      "longitude_degrees": -165.763026,
      "magnetic_latitude_degrees": 52.6,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 7,
      "kp_noticeable_threshold": 8,
      "kp_bright_threshold": 9
    },
    {
      "city": "Alakanuk",
      "state": "Alaska",
      "city_slug": "alakanuk",
      "latitude_degrees": 62.710997,
      "longitude_degrees": -164.649719,
      "magnetic_latitude_degrees": 61,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Alatna",
      "state": "Alaska",
      "city_slug": "alatna",
      "latitude_degrees": 66.563794,
      "longitude_degrees": -152.838498,
      "magnetic_latitude_degrees": 66.4,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Aleknagik",
      "state": "Alaska",
      "city_slug": "aleknagik",
      "latitude_degrees": 59.288961,
      "longitude_degrees": -158.664343,
      "magnetic_latitude_degrees": 58.7,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Allakaket",
      "state": "Alaska",
      "city_slug": "allakaket",
      "latitude_degrees": 66.542002,
      "longitude_degrees": -152.583016,
      "magnetic_latitude_degrees": 66.4,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Ambler",
      "state": "Alaska",
      "city_slug": "ambler",
      "latitude_degrees": 67.090944,
      "longitude_degrees": -157.887097,
      "magnetic_latitude_degrees": 66.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Anaktuvuk Pass",
      "state": "Alaska",
      "city_slug": "anaktuvuk-pass",
      "latitude_degrees": 68.149752,
      "longitude_degrees": -151.697066,
      "magnetic_latitude_degrees": 68,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Anchorage",
      "state": "Alaska",
      "city_slug": "anchorage",
      "latitude_degrees": 61.2181,
      "longitude_degrees": -149.9003,
      "magnetic_latitude_degrees": 61.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Anderson",
      "state": "Alaska",
      "city_slug": "anderson",
      "latitude_degrees": 64.308281,
      "longitude_degrees": -149.163187,
      "magnetic_latitude_degrees": 64.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Angoon",
      "state": "Alaska",
      "city_slug": "angoon",
      "latitude_degrees": 57.441257,
      "longitude_degrees": -134.478357,
      "magnetic_latitude_degrees": 60.8,
      "timezone": "America/Sitka",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Aniak",
      "state": "Alaska",
      "city_slug": "aniak",
      "latitude_degrees": 61.578825,
      "longitude_degrees": -159.547427,
      "magnetic_latitude_degrees": 60.7,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Anvik",
      "state": "Alaska",
      "city_slug": "anvik",
      "latitude_degrees": 62.631627,
      "longitude_degrees": -160.215106,
      "magnetic_latitude_degrees": 61.6,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Atka",
      "state": "Alaska",
      "city_slug": "atka",
      "latitude_degrees": 52.211546,
      "longitude_degrees": -174.213452,
      "magnetic_latitude_degrees": 49.5,
      "timezone": "America/Adak",
      "kp_horizon_threshold": 8,
      "kp_noticeable_threshold": 9,
      "kp_bright_threshold": 9
    },
    {
      "city": "Atqasuk",
      "state": "Alaska",
      "city_slug": "atqasuk",
      "latitude_degrees": 70.480786,
      "longitude_degrees": -157.325459,
      "magnetic_latitude_degrees": 69.2,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Barrow",
      "state": "Alaska",
      "city_slug": "barrow",
      "latitude_degrees": 71.290556,
      "longitude_degrees": -156.788611,
      "magnetic_latitude_degrees": 70,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Beaver",
      "state": "Alaska",
      "city_slug": "beaver",
      "latitude_degrees": 66.362998,
      "longitude_degrees": -147.396705,
      "magnetic_latitude_degrees": 67.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Bethel",
      "state": "Alaska",
      "city_slug": "bethel",
      "latitude_degrees": 60.799444,
      "longitude_degrees": -161.755833,
      "magnetic_latitude_degrees": 59.6,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Bettles",
      "state": "Alaska",
      "city_slug": "bettles",
      "latitude_degrees": 66.913889,
      "longitude_degrees": -151.518056,
      "magnetic_latitude_degrees": 66.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Brevig Mission",
      "state": "Alaska",
      "city_slug": "brevig-mission",
      "latitude_degrees": 65.331111,
      "longitude_degrees": -166.493056,
      "magnetic_latitude_degrees": 63.1,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 3,
      "kp_noticeable_threshold": 4,
      "kp_bright_threshold": 5
    },
    {
      "city": "Buckland",
      "state": "Alaska",
      "city_slug": "buckland",
      "latitude_degrees": 65.981667,
      "longitude_degrees": -161.149167,
      "magnetic_latitude_degrees": 64.6,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Chalkyitsik",
      "state": "Alaska",
      "city_slug": "chalkyitsik",
      "latitude_degrees": 66.645,
      "longitude_degrees": -143.740278,
      "magnetic_latitude_degrees": 67.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Chefornak",
      "state": "Alaska",
      "city_slug": "chefornak",
      "latitude_degrees": 60.149167,
      "longitude_degrees": -164.285833,
      "magnetic_latitude_degrees": 58.6,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Chevak",
      "state": "Alaska",
      "city_slug": "chevak",
      "latitude_degrees": 61.540833,
      "longitude_degrees": -165.584722,
      "magnetic_latitude_degrees": 59.7,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Chicken",
      "state": "Alaska",
      "city_slug": "chicken",
      "latitude_degrees": 64.073056,
      "longitude_degrees": -141.932222,
      "magnetic_latitude_degrees": 65.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Chignik",
      "state": "Alaska",
      "city_slug": "chignik",
      "latitude_degrees": 56.305556,
      "longitude_degrees": -158.401389,
      "magnetic_latitude_degrees": 55.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 6,
      "kp_noticeable_threshold": 7,
      "kp_bright_threshold": 8
    },
    {
      "city": "Chignik Lagoon",
      "state": "Alaska",
      "city_slug": "chignik-lagoon",
      "latitude_degrees": 56.311111,
      "longitude_degrees": -158.536111,
      "magnetic_latitude_degrees": 55.8,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 6,
      "kp_noticeable_threshold": 7,
      "kp_bright_threshold": 8
    },
    {
      "city": "Chignik Lake",
      "state": "Alaska",
      "city_slug": "chignik-lake",
      "latitude_degrees": 56.255556,
      "longitude_degrees": -158.775,
      "magnetic_latitude_degrees": 55.8,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 6,
      "kp_noticeable_threshold": 7,
      "kp_bright_threshold": 8
    },
    {
      "city": "Chistochina",
      "state": "Alaska",
      "city_slug": "chistochina",
      "latitude_degrees": 62.567222,
      "longitude_degrees": -144.669444,
      "magnetic_latitude_degrees": 64,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Chitina",
      "state": "Alaska",
      "city_slug": "chitina",
      "latitude_degrees": 61.515556,
      "longitude_degrees": -144.439167,
      "magnetic_latitude_degrees": 63.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 3,
      "kp_noticeable_threshold": 4,
      "kp_bright_threshold": 5
    },
    {
      "city": "Chuathbaluk",
      "state": "Alaska",
      "city_slug": "chuathbaluk",
      "latitude_degrees": 61.579167,
      "longitude_degrees": -159.220833,
      "magnetic_latitude_degrees": 60.7,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Circle",
      "state": "Alaska",
      "city_slug": "circle",
      "latitude_degrees": 65.827778,
      "longitude_degrees": -144.064167,
      "magnetic_latitude_degrees": 67.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Clark's Point",
      "state": "Alaska",
      "city_slug": "clarks-point",
      "latitude_degrees": 58.836389,
      "longitude_degrees": -158.555278,
      "magnetic_latitude_degrees": 58.3,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Coffman Cove",
      "state": "Alaska",
      "city_slug": "coffman-cove",
      "latitude_degrees": 56.009722,
      "longitude_degrees": -132.833056,
      "magnetic_latitude_degrees": 59.7,
      "timezone": "America/Sitka",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Cold Bay",
      "state": "Alaska",
      "city_slug": "cold-bay",
      "latitude_degrees": 55.206111,
      "longitude_degrees": -162.721389,
      "magnetic_latitude_degrees": 54.1,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 6,
      "kp_noticeable_threshold": 7,
      "kp_bright_threshold": 8
    },
    {
      "city": "Cordova",
      "state": "Alaska",
      "city_slug": "cordova",
      "latitude_degrees": 60.542222,
      "longitude_degrees": -145.7575,
      "magnetic_latitude_degrees": 61.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Craig",
      "state": "Alaska",
      "city_slug": "craig",
      "latitude_degrees": 55.478056,
      "longitude_degrees": -133.148611,
      "magnetic_latitude_degrees": 59.1,
      "timezone": "America/Sitka",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Crooked Creek",
      "state": "Alaska",
      "city_slug": "crooked-creek",
      "latitude_degrees": 61.868056,
      "longitude_degrees": -158.135556,
      "magnetic_latitude_degrees": 61.2,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Deering",
      "state": "Alaska",
      "city_slug": "deering",
      "latitude_degrees": 66.069167,
      "longitude_degrees": -162.766111,
      "magnetic_latitude_degrees": 64.4,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Delta Junction",
      "state": "Alaska",
      "city_slug": "delta-junction",
      "latitude_degrees": 64.037222,
      "longitude_degrees": -145.734167,
      "magnetic_latitude_degrees": 65.2,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Dillingham",
      "state": "Alaska",
      "city_slug": "dillingham",
      "latitude_degrees": 59.039444,
      "longitude_degrees": -158.4575,
      "magnetic_latitude_degrees": 58.5,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Diomede",
      "state": "Alaska",
      "city_slug": "diomede",
      "latitude_degrees": 65.759167,
      "longitude_degrees": -168.958056,
      "magnetic_latitude_degrees": 63.2,
      "timezone": "Asia/Anadyr",
      "kp_horizon_threshold": 3,
      "kp_noticeable_threshold": 4,
      "kp_bright_threshold": 5
    },
    {
      "city": "Dot Lake",
      "state": "Alaska",
      "city_slug": "dot-lake",
      "latitude_degrees": 63.661667,
      "longitude_degrees": -144.070556,
      "magnetic_latitude_degrees": 65.1,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "Eagle",
      "state": "Alaska",
      "city_slug": "eagle",
      "latitude_degrees": 64.787778,
      "longitude_degrees": -141.199722,
      "magnetic_latitude_degrees": 66.6,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 1,
      "kp_noticeable_threshold": 2,
      "kp_bright_threshold": 3
    },
    {
      "city": "Eek",
      "state": "Alaska",
      "city_slug": "eek",
      "latitude_degrees": 60.213611,
      "longitude_degrees": -162.026944,
      "magnetic_latitude_degrees": 59,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Egegik",
      "state": "Alaska",
      "city_slug": "egegik",
      "latitude_degrees": 58.215556,
      "longitude_degrees": -157.375556,
      "magnetic_latitude_degrees": 57.8,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Ekwok",
      "state": "Alaska",
      "city_slug": "ekwok",
      "latitude_degrees": 59.350556,
      "longitude_degrees": -157.475278,
      "magnetic_latitude_degrees": 58.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 5,
      "kp_noticeable_threshold": 6,
      "kp_bright_threshold": 7
    },
    {
      "city": "Elim",
      "state": "Alaska",
      "city_slug": "elim",
      "latitude_degrees": 64.620278,
      "longitude_degrees": -162.261389,
      "magnetic_latitude_degrees": 63.1,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 3,
      "kp_noticeable_threshold": 4,
      "kp_bright_threshold": 5
    },
    {
      "city": "Emmonak",
      "state": "Alaska",
      "city_slug": "emmonak",
      "latitude_degrees": 62.784444,
      "longitude_degrees": -164.533056,
      "magnetic_latitude_degrees": 61.1,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Eyak",
      "state": "Alaska",
      "city_slug": "eyak",
      "latitude_degrees": 60.542222,
      "longitude_degrees": -145.7575,
      "magnetic_latitude_degrees": 61.9,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 4,
      "kp_noticeable_threshold": 5,
      "kp_bright_threshold": 6
    },
    {
      "city": "Fairbanks",
      "state": "Alaska",
      "city_slug": "fairbanks",
      "latitude_degrees": 64.8378,
      "longitude_degrees": -147.7164,
      "magnetic_latitude_degrees": 65.6,
      "timezone": "America/Anchorage",
      "kp_horizon_threshold": 2,
      "kp_noticeable_threshold": 3,
      "kp_bright_threshold": 4
    },
    {
      "city": "False Pass",
      "state": "Alaska",
      "city_slug": "false-pass",
      "latitude_degrees": 54.848056,
      "longitude_degrees": -163.410556,
      "magnetic_latitude_degrees": 53.7,
      "timezone": "America/Nome",
      "kp_horizon_threshold": 7,
      "kp_noticeable_threshold": 8,
      "kp_bright_threshold": 9
    },
    {
      "city": "Fort Yukon",
      "state": "Alaska",
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