~ National Lightning Safety Institute ~

Section 4.10

Lightning safety awareness is a priority at all outdoor activities. No place outdoors is 100% safe from lightning. The important thing to remember is to "Anticipate a high-risk situation and move to a low-risk location." A comprehensive lightning safety program consists of the following details:

1. Detection. Lightning conditions are to be monitored continuously. In most cases, a combination of a lightning network subscription service, a professional-grade lightning warning system, and a high-quality hand-held detector is suggested. However, if thunder is heard, the danger is close enough to suspend operations and to seek refuge.
2. Notification. Suspension and resumption of work activities are planned in advance:
   • Yellow condition: 20-40 miles (30-60 km). Threat may exist.
   • Amber condition: 10-20 miles (16-30 km). Threat is nearby
   • Red alert: 0-10 miles (0-16 km). No one is permitted outdoors.
3. Designation of lightning-safe shelters. Safe evacuation sites include:
   • Fully enclosed all-metal vehicles
   • Permanent, substantial buildings
   • Designated metal shelters especially designed
   • Other locations as identified by ES&H personnel
   Unsafe areas during thunderstorms include proximity to all metal objects, such as power poles, fences and gates, light poles, metal machinery, electrical equipment, hauling machinery, and radio equipment. Avoid rooftops. Avoid water. Avoid all open areas.
4. Re-assessment of the threat. Wait until thunder is no longer heard before resuming activities. Be extra cautious during this storm phase, as the lightning danger still may be a significant hazard.
5. Corporate lightning safety policies and procedures.
6. Lightning safety training for outdoor workers.

People who have been struck by lightning do not carry an electrical charge and are safe to assist. Apply first aid immediately if you are qualified to do so. Get emergency help promptly.