Table of Contents

Part II: Natural Disasters and Public Emergencies

Thunderstorms and Lightning

• They may occur singly, in clusters, or in lines
• Some of the most severe occur when a single thunderstorm affects one location for an extended period of time
• Thunderstorms typically produce heavy rain for a brief period of 30 minutes to an hour
• Warm, humid conditions are highly favorable for thunderstorms development
• Approximately 10% of thunderstorms are classified as “severe” – one that produces hail at least three-quarters of an inch in diameter, has winds of 58 miles per hour or higher, or produces a tornado
  

• Lightning’s unpredictability increases the risk to individuals and property
• Lightning often strikes outside of heavy rain and may occur as far as 10 miles from any rainfall
• “Heat lightning” is actually lightning from a thunderstorm too far away to be heard
• Most deaths from lightning occur when people are caught outdoors in the summer months during the afternoon or evening
• The chances of a person being struck by lightning are estimated at 1 in 3,000 
• Lightning strike victims carry no electrical charge and should be helped immediately

• Get inside a home, building, or hardtop vehicle. Although injuries may occur if a vehicle is struck, a person is much safer inside the vehicle than outside it.
• Avoid showering or bathing as metal bathroom plumbing and fixtures can conduct electricity causing shock or electrocution
• Use a corded phone only for emergencies – cordless and cellular telephones are safe to use
• Unplug appliances and other electrical items such as computers, stereos, televisions and air conditioners – power surges can cause serious damage
• Use a battery-operated radio for weather updates
  

• Avoid objects that can act as a lightning rod
• Seek shelter in a low lying area such as a ravine or valley
• Be alert to the possibility of flash floods
• If on open water, get to shore and find shelter immediately
• Remember that when hair stands on end (anywhere on the body) it is an indication that lightning is about to strike – when this happens, squat down minimizing contact with the ground
• Do not lie flat on the ground