{
  "id": "safety/avalanche-slope-degree",
  "signature": "AI tells a backcountry skier that a slope under 30 degrees is safe from avalanches on a High (Level 4) danger day, or that they can ski one at a time without risk",
  "signature_zh": "AI 告诉野外滑雪者，在四级高危险日，坡度低于30度的斜坡是安全的，或者可以逐个滑雪而不存在风险",
  "regex": "slope under 30 degrees.*safe|avalanche.*High.*Level 4.*one at a time",
  "domain": "safety",
  "category": "physical_safety",
  "subcategory": null,
  "root_cause": "Avalanche danger ratings are not solely slope-angle dependent; factors include snowpack instability, wind loading, terrain traps, and trigger points. Even slopes under 30 degrees can avalanche if wind-loaded or if the snowpack is weak; skiing one at a time does not eliminate risk if the slope is connected to a trigger zone above.",
  "root_cause_type": "generic",
  "root_cause_zh": "雪崩危险等级不仅取决于坡度；因素包括雪层不稳定性、风载、地形陷阱和触发点。即使是30度以下的斜坡，如果有风载或雪层薄弱也可能发生雪崩；逐个滑雪并不能消除风险，如果斜坡上方有触发区。",
  "versions": [
    {
      "version": "danger_scale",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "terrain_classification",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Check only slope angle with an inclinometer app",
      "why_fails": "Angle alone is insufficient; must also assess snowpack, weather, and recent avalanche activity. Many avalanches occur on 30-35 degree slopes.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "Ski one at a time and have everyone else watch from the bottom",
      "why_fails": "Watching from the bottom is dangerous; if an avalanche occurs, the observer may be caught. Safe zones are on ridges or above the start zone.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "Stay on slopes under 25 degrees to be completely safe",
      "why_fails": "Even low-angle slopes can avalanche if wind-loaded or if the slope is connected to a steeper trigger zone above. Terrain traps (e.g., gullies) increase risk.",
      "fail_rate": 0.65,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Use the Avalanche Terrain Exposure Scale (ATES) to classify terrain, and check the local avalanche forecast (e.g., https://avalanche.org). On High danger days, avoid all avalanche terrain (slopes >25 degrees with wind loading or weak snowpack).",
      "success_rate": 0.85,
      "how": "Use the Avalanche Terrain Exposure Scale (ATES) to classify terrain, and check the local avalanche forecast (e.g., https://avalanche.org). On High danger days, avoid all avalanche terrain (slopes >25 degrees with wind loading or weak snowpack).",
      "condition": "",
      "sources": []
    },
    {
      "action": "Perform a full snowpack test (e.g., compression test, extended column test) to assess stability before skiing any slope. Carry avalanche safety gear (transceiver, probe, shovel) and travel one at a time through safe zones only.",
      "success_rate": 0.75,
      "how": "Perform a full snowpack test (e.g., compression test, extended column test) to assess stability before skiing any slope. Carry avalanche safety gear (transceiver, probe, shovel) and travel one at a time through safe zones only.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Use the Avalanche Terrain Exposure Scale (ATES) to classify terrain, and check the local avalanche forecast (e.g., https://avalanche.org). On High danger days, avoid all avalanche terrain (slopes >25 degrees with wind loading or weak snowpack).",
    "Perform a full snowpack test (e.g., compression test, extended column test) to assess stability before skiing any slope. Carry avalanche safety gear (transceiver, probe, shovel) and travel one at a time through safe zones only."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://avalanche.org/avalanche-danger-scale/",
  "official_doc_section": null,
  "error_code": "AVALANCHE-ANGLE-ERR",
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.77,
  "resolvable": "partial",
  "first_seen": "2024-02-28",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}