# AI tells someone caught in a thunderstorm outdoors to crouch low to the ground with feet together, or to lie flat, to avoid lightning strikes

- **ID:** `safety/lightning-safety-crouch-myth`
- **Domain:** safety
- **Category:** physical_safety
- **Error Code:** `LIGHTNING-SAFETY-002`
- **Verification:** ai_generated
- **Fix Rate:** 95%

## Root Cause

The 'lightning crouch' (feet together, crouch low) was previously recommended by some safety organizations but has been deprecated because it provides negligible protection compared to moving to a substantial building or hard-topped vehicle; lying flat increases ground current exposure and is dangerous; the only effective mitigation is to get inside a safe structure as quickly as possible

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| NOAA Lightning Safety Guidelines 2023 | active | — | — |
| NFPA 780 Standard for Lightning Protection 2023 | active | — | — |

## Workarounds

1. **Immediately move to a substantial building (with plumbing and wiring) or a hard-topped metal vehicle. If no shelter is available, avoid open fields, hilltops, and isolated trees. Crouching is a last resort only if you are in a group and cannot reach shelter, but it is not recommended as a primary strategy.** (95% success)
   ```
   Immediately move to a substantial building (with plumbing and wiring) or a hard-topped metal vehicle. If no shelter is available, avoid open fields, hilltops, and isolated trees. Crouching is a last resort only if you are in a group and cannot reach shelter, but it is not recommended as a primary strategy.
   ```
2. **Follow the 30-30 rule: if time between seeing lightning and hearing thunder is less than 30 seconds, go indoors. Stay indoors for 30 minutes after the last thunderclap.** (90% success)
   ```
   Follow the 30-30 rule: if time between seeing lightning and hearing thunder is less than 30 seconds, go indoors. Stay indoors for 30 minutes after the last thunderclap.
   ```

## Dead Ends

- **Crouch low with feet together to minimize height and step potential** — Crouching does not significantly reduce risk; step potential is a minor factor compared to direct strike; the primary danger is being the tallest object, which crouching does not solve (85% fail)
- **Lie flat on the ground to present a lower profile** — Lying flat increases the area of contact with the ground, raising the risk of ground current injury; it also exposes more of the body to a direct strike (90% fail)