If a tornado can form, it expends much more energy lifting cold, dense air. By definition, all thunderstorms produce lightning and it does not necessarily have to be raining for lightning to strike. These lightning strikes come out of the upper portions or anvil region of the storm which can easily extend 10 miles or so up into the atmosphere. In general, lightning bolts will travel the easiest route from the cloud to the ground which means that it often strikes the tallest object in an area. Therefore, a simple rule is to avoid making yourself the tallest object and never stand near the tallest object in your immediate area.
Lightning bolts can be miles in length, but the channel is usually quite narrow.
Thunder is caused by intense heating of the air along the lightning channel. The rapid expansion of the heated air causes it to explode into sound waves. Thunder can be heard up to 20 miles away from the center of the storm. Those who have been struck by lightning and survive often recall tingling sensations in their hands and feet, hair standing on end and a sulphur smell. If you realize that you are about to be struck by lightning, immediately drop to your knees , cover your head with your hands and make yourself as small of a target as possible.