{
  "schemaVersion": 1,
  "verifiedAt": "2026-11-01T04:56:21Z",
  "browserFetchesAtUseTime": true,
  "sources": [
    {"id":"nws-forecasts","publisher":"National Weather Service","kind":"official forecast","url":"https://www.weather.gov/documentation/services-web-api","endpoint":"https://api.weather.gov/points/{latitude},{longitude}","cacheMinutes":15,"notes":"Forecast and hourly endpoints are discovered from the point response. The roughly 2.5 km forecast grid and its elevation are disclosed; these are not measurements at the selected position."},
    {"id":"nws-observations","publisher":"National Weather Service and station providers","kind":"official station observation feed","url":"https://www.weather.gov/documentation/services-web-api","endpoint":"https://api.weather.gov/stations/{stationId}/observations/latest","cacheMinutes":5,"maximumObservationAgeMinutes":120,"notes":"Up to six nearby stations within 50 km are checked. The nearest usable recent observation is selected; actual station distance, altitude, timestamp and units are preserved. Fresh HTTP retrieval does not make an old observation current."},
    {"id":"nws-regional-alerts","publisher":"National Weather Service","kind":"official current alert feed","url":"https://www.weather.gov/media/documentation/docs/NWS_Geolocation.pdf","endpoint":"https://api.weather.gov/alerts/active?area=CA","cacheMinutes":2,"notes":"All California active alerts are queried, then actual warning polygons or official affected-zone boundaries are intersected with the entire 11-mile summit circle and the town rectangle. This covers warnings away from summit and town sample points. Unresolved zone geometries produce an explicitly partial coverage state. The circle is conservatively approximated with 192 vertices, adding less than three meters."},
    {"id":"msac-nac-map-layer","publisher":"Mount Shasta Avalanche Center / National Avalanche Center","kind":"official regional avalanche forecast metadata","url":"https://www.shastaavalanche.org/advisories/avalanche-advisory/#/mount-shasta","endpoint":"https://api.avalanche.org/v2/public/products/map-layer/MSAC","cacheMinutes":5,"notes":"The source provides a regional maximum danger rating and its forecast coverage geometry. This is not an avalanche-path inventory or a local slope assessment. No-rating and expired responses never become low danger. Full danger roses and avalanche problems remain in the original bulletin."},
    {"id":"usfs-current-alerts","publisher":"USDA Forest Service, Shasta-Trinity National Forest","kind":"official current index","url":"https://www.fs.usda.gov/r05/shasta-trinity/alerts","liveIntegrated":false,"notes":"Open the current agency index to verify current closures, forest orders and restrictions. Linked order records in this static atlas are dated source records, not a continuous closure-status service."},
    {"id":"usfs-current-conditions","publisher":"USDA Forest Service, Shasta-Trinity National Forest","kind":"official current conditions index","url":"https://www.fs.usda.gov/r05/shasta-trinity/conditions","liveIntegrated":false},
    {"id":"airnow-fire-smoke","publisher":"US EPA / US Forest Service and partners","kind":"official fire, smoke and air-quality reference","url":"https://fire.airnow.gov/","liveIntegrated":false,"notes":"Air quality is checked in the official external map; this atlas does not interpolate air-quality readings to a campsite or infer conditions from the absence of a sensor."},
    {"id":"inciweb","publisher":"National Interagency Fire Center and incident agencies","kind":"official incident information reference","url":"https://inciweb.wildfire.gov/","liveIntegrated":false},
    {"id":"calfire-incidents","publisher":"CAL FIRE","kind":"official California incident information reference","url":"https://www.fire.ca.gov/incidents","liveIntegrated":false},
    {"id":"nifc-fire-perimeters","publisher":"National Interagency Fire Center / WFIGS","kind":"official reported fire perimeter feed","url":"https://data-nifc.opendata.arcgis.com/datasets/nifc::wfigs-current-interagency-fire-perimeters/about","endpoint":"https://services3.arcgis.com/T4QMspbfLg3qTGWY/ArcGIS/rest/services/WFIGS_Interagency_Perimeters_Current/FeatureServer/0/query","liveIntegrated":true,"cacheMinutes":5,"notes":"A bounding-envelope query retrieves published current-service polygons, then actual geometries are intersected with the summit circle and town rectangle. Original perimeter timestamp and incident update timestamp are retained. Wildfire and prescribed fire remain distinct. A perimeter is not a live fire edge or an evacuation zone. Service truncation produces a partial state; no returned perimeter does not mean no fire."},
    {"id":"usgs-mount-shasta","publisher":"US Geological Survey, California Volcano Observatory","kind":"official volcano status service and hazard reference","url":"https://www.usgs.gov/volcanoes/mount-shasta","documentationUrl":"https://volcanoes.usgs.gov/vsc/api/volcanoApi/","endpoint":"https://volcanoes.usgs.gov/vsc/api/volcanoApi/vhpstatus/323010","liveIntegrated":true,"cacheMinutes":5,"notes":"The documented USGS service reports volcano alert level and aviation color code. The provider may omit an alert issuance timestamp, which remains unknown. Long-term volcanic hazard scenarios are separate from present alert level and from weather or avalanche forecasts."},
    {"id":"siskiyou-emergency","publisher":"Siskiyou County Office of Emergency Services","kind":"official emergency information reference","url":"https://www.co.siskiyou.ca.us/emergencyservices","liveIntegrated":false}
  ],
  "nacTimestampEvidence": {
    "scope":"Only start_date and end_date fields of the NAC public products/map-layer feed",
    "convention":"Naive ISO date-time strings are interpreted as UTC before conversion to the feature.timezone display zone.",
    "evidenceType":"Observed first-party production implementation, not a written API specification",
    "entryPage":"https://www.shastaavalanche.org/advisories/avalanche-advisory/",
    "loader":"https://du6amfiq9m9h7.cloudfront.net/loader/nac-widget-loader.min.js",
    "bundle":"https://du6amfiq9m9h7.cloudfront.net/public/v2/20261014/danger-map.js",
    "sha256":"ffc2bea53ca1d69baafdc6d872e30b80fb15e8a3c75ca5f710a9cf2089150891",
    "retrievedAt":"2026-11-01T04:56:21Z",
    "issueCodeExcerpt":"ky.utc(this.feature.start_date)",
    "expiryCodeExcerpt":"ky.utc(this.feature.end_date)",
    "displayCodeExcerpt":"ky(a).tz(this.feature.timezone).format(this.format)",
    "fallbackPolicy":"Unknown or malformed timestamp formats suppress a current numeric rating. Expired, future and stale products also suppress it. Unrelated feeds still require explicit UTC offsets."
  },
  "limitations":["No complete hazard inventory is claimed.","Absence of alerts, ratings, fire polygons or reports does not establish safe conditions.","Public APIs may be unavailable, delayed or blocked by a visitor’s network; each product reports its own status.","Regional alert and avalanche geometries retain the source’s actual geographic meaning."]
}