# AI tells a backcountry skier that a slope under 30 degrees is safe from avalanches on a High (Level 4) danger day, ignoring that persistent weak layers can fail on slopes as low as 25 degrees

- **ID:** `safety/avalanche-safety-thirty-degree-myth`
- **Domain:** safety
- **Category:** physical_safety
- **Error Code:** `AVALANCHE-30DEG-MYTH-001`
- **Verification:** ai_generated
- **Fix Rate:** 82%

## Root Cause

Avalanche danger is determined by snowpack instability, not just slope angle; persistent weak layers (e.g., depth hoar, surface hoar) can trigger avalanches on slopes as low as 25 degrees, especially under High danger ratings where human-triggered avalanches are likely

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Avalanche Danger Scale 1.0 | active | — | — |
| CAIC 2024 | active | — | — |
| NWAC 2024 | active | — | — |

## Workarounds

1. **Check daily avalanche forecast from local avalanche center (e.g., CAIC, NWAC, Avalanche Canada) and avoid slopes over 25 degrees on High danger days when persistent weak layers are present. Use the 'Avaluator' decision-making tool or 'SnowPilot' app for terrain assessment.** (88% success)
   ```
   Check daily avalanche forecast from local avalanche center (e.g., CAIC, NWAC, Avalanche Canada) and avoid slopes over 25 degrees on High danger days when persistent weak layers are present. Use the 'Avaluator' decision-making tool or 'SnowPilot' app for terrain assessment.
   ```
2. **Perform a snowpit test (e.g., compression test, extended column test) to assess slab stability before entering any slope over 20 degrees on High danger days** (75% success)
   ```
   Perform a snowpit test (e.g., compression test, extended column test) to assess slab stability before entering any slope over 20 degrees on High danger days
   ```
3. **Use the 'Red Flag' criteria: if any avalanche advisory mentions 'persistent weak layer' or 'deep slab problem', treat all slopes over 20 degrees as suspect** (82% success)
   ```
   Use the 'Red Flag' criteria: if any avalanche advisory mentions 'persistent weak layer' or 'deep slab problem', treat all slopes over 20 degrees as suspect
   ```

## Dead Ends

- **Check slope angle with inclinometer but ignore avalanche forecast for that day** — User assumes any slope under 30 degrees is safe based on general rule of thumb, ignoring specific snowpack conditions (85% fail)
- **Use slope angle app alone to determine safety** — User relies on smartphone app that only shows slope angle without integrating danger rating (70% fail)
- **Assume 30-35 degree slopes are safe because they are 'moderate'** — User thinks High danger only affects slopes over 35 degrees, a common misbelief from outdated training (90% fail)