{
  "siteId": "isle-royale-np",
  "siteName": "Isle Royale National Park",
  "region": "Lake Superior, MI",
  "bortle": 2,
  "generatedAt": "2026-08-15T02:05:08.392Z",
  "tonight": {
    "date": "2026-08-14T21:10",
    "nightStartIso": "2026-08-14T21:10",
    "nightEndIso": "2026-08-15T06:51",
    "moonPhase": "New moon",
    "moonIlluminationPct": 2,
    "verdict": "Fair",
    "verdictReason": "Short 2h window, otherwise mean cloud 54%. Worth a look if you're nearby.",
    "confidence": "Medium",
    "meanCloudPct": 54,
    "minCloudPct": 1,
    "bestWindow": {
      "startIso": "2026-08-14T22:00:00.000Z",
      "endIso": "2026-08-14T23:00:00.000Z",
      "hours": 2,
      "meanCloudPct": 14
    }
  },
  "citations": [
    {
      "label": "Open-Meteo Forecast API (cloud, humidity, wind, visibility)",
      "url": "https://open-meteo.com/en/docs"
    },
    {
      "label": "Open-Meteo astronomical data (sunrise, sunset, moon)",
      "url": "https://open-meteo.com/en/docs"
    },
    {
      "label": "Bortle scale reference for site darkness",
      "url": "https://en.wikipedia.org/wiki/Bortle_scale"
    }
  ]
}