{
  "id": "safety/avalanche-slope-30-degrees",
  "signature": "AI tells a backcountry skier that a slope under 30 degrees is safe from avalanches on a High (Level 4) danger day",
  "signature_zh": "AI告诉野外滑雪者，在高等（4级）危险日，30度以下的斜坡是安全的，不会发生雪崩",
  "regex": "avalanche.*(?:30.degree|safe.*slope|low.*angle|level.4)",
  "domain": "safety",
  "category": "physical_safety",
  "subcategory": null,
  "root_cause": "On High (Level 4) avalanche danger days, avalanches can run out onto lower-angle terrain (25-30 degrees) from steeper start zones above; remotely triggered avalanches are common from flat areas.",
  "root_cause_type": "generic",
  "root_cause_zh": "在高等（4级）雪崩危险日，雪崩可以从上方更陡的起始区域蔓延到较低角度（25-30度）的地形；从平坦区域远程触发的雪崩很常见。",
  "versions": [
    {
      "version": "standard",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "software",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "tool",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Assuming 30 degrees is safe ignores that avalanches can propagate from steeper terrain above; even 20-degree slopes can slide with persistent weak layers.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Checking only slope angle without evaluating snowpack stability (e.g., ignoring buried weak layers) leads to false confidence.",
      "fail_rate": 0.65,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Relying on a single avalanche beacon check without companion rescue training gives a false sense of security.",
      "fail_rate": 0.55,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "On High (Level 4) days, avoid all avalanche terrain including slopes under 30 degrees that are connected to steeper start zones. Use the CAIC danger rating: `python3 -c \"import requests; r=requests.get('https://api.avalanche.org/v2/forecasts?zone=CO').json(); print('Danger level:', r['danger_rating'])\"`",
      "success_rate": 0.85,
      "how": "On High (Level 4) days, avoid all avalanche terrain including slopes under 30 degrees that are connected to steeper start zones. Use the CAIC danger rating: `python3 -c \"import requests; r=requests.get('https://api.avalanche.org/v2/forecasts?zone=CO').json(); print('Danger level:', r['danger_rating'])\"`",
      "condition": "",
      "sources": []
    },
    {
      "action": "Perform a compression test and ECT (Extended Column Test) on any slope you plan to ski. If the test fails (ECTP or ECTX), abort. Command: `python3 -c \"test=input('ECT result (ECTP/ECTX/ECTN): '); print('DO NOT ski' if test in ['ECTP','ECTX'] else 'Proceed with caution')\"`",
      "success_rate": 0.8,
      "how": "Perform a compression test and ECT (Extended Column Test) on any slope you plan to ski. If the test fails (ECTP or ECTX), abort. Command: `python3 -c \"test=input('ECT result (ECTP/ECTX/ECTN): '); print('DO NOT ski' if test in ['ECTP','ECTX'] else 'Proceed with caution')\"`",
      "condition": "",
      "sources": []
    },
    {
      "action": "Travel one at a time on all slopes, even low-angle ones. Use safe island zones (trees, ridges) for regrouping. Verify with: `python3 -c \"print('On High danger: ski only slopes <25 deg with no overhead hazard, one at a time')\"`",
      "success_rate": 0.78,
      "how": "Travel one at a time on all slopes, even low-angle ones. Use safe island zones (trees, ridges) for regrouping. Verify with: `python3 -c \"print('On High danger: ski only slopes <25 deg with no overhead hazard, one at a time')\"`",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "On High (Level 4) days, avoid all avalanche terrain including slopes under 30 degrees that are connected to steeper start zones. Use the CAIC danger rating: `python3 -c \"import requests; r=requests.get('https://api.avalanche.org/v2/forecasts?zone=CO').json(); print('Danger level:', r['danger_rating'])\"`",
    "Perform a compression test and ECT (Extended Column Test) on any slope you plan to ski. If the test fails (ECTP or ECTX), abort. Command: `python3 -c \"test=input('ECT result (ECTP/ECTX/ECTN): '); print('DO NOT ski' if test in ['ECTP','ECTX'] else 'Proceed with caution')\"`",
    "Travel one at a time on all slopes, even low-angle ones. Use safe island zones (trees, ridges) for regrouping. Verify with: `python3 -c \"print('On High danger: ski only slopes <25 deg with no overhead hazard, one at a time')\"`"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.avalanche.org/avalanche-danger-scale",
  "official_doc_section": null,
  "error_code": "AVALANCHE-009",
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.84,
  "resolvable": "partial",
  "first_seen": "2024-02-14",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}