During the Storm

Indoors
Secure outdoor objects such as lawn furniture that could blow away or cause damage or injury.
Take light objects inside.
Shutter windows securely and brace outside doors.
Listen to a battery operated radio or television for the latest storm information.
Do not handle any electrical equipment or telephones because lightning could follow the wire. Television sets are particularly dangerous at this time.
Avoid bathtubs, water faucets, and sinks because metal pipes can transmit electricity.

Outdoors
Attempt to get into a building or car.
If no structure is available, get to an open space an squat low to the ground as quickly as possible. (If in the woods, find an area protected by low clump of trees--never stand underneath a single large tree in the open.) Be aware of the potential for flooding in low-lying areas. crouch with hands on knees.
Avoid tall structures such as towers, tall trees, fences, telephone lines, or power lines.
Stay away from natural lightning rods such as golf clubs, tractors, fishing rods, bicycles, or camping equipment.
Stay from rivers, lakes, or other bodies of water. If you are isolated in a level field or prairie and you feel your hair stand on end (which indicates that lightning is about to strike), bend forward, putting your hands on your knees. A position with feet together and crouching while removing all metal objects is recommended. Do not lie flat on the ground.

In a Car
Pull safely onto the shoulder of the road away from any trees that could fall on the vehicle.
Stay in the car and turn on the emergency flashers until the heavy rains subside.
Avoid flooded roadways.

Estimating the Distance
Because light travels much faster than sound, lightning flashes can be seen long before the resulting thunder is heard. Estimate the number of miles you are from a thunderstorm by counting the number of seconds between a flash of lightning and the next clap of thunder. Divide this number by five.
Important: You are in danger from lightning if you can hear thunder. Knowing how far away a storm is does not mean that you're in danger only when the storm is overhead.