A Warning is issued when severe weather is actually occurring. For instanace, a tornado warning means a tornado has actually been sighted or has been indicated by radar. The warning usually encompasses a relatively small geographic area. Remember that you can helpl, too, by reporting all severe weather to your local county sheriff or state police. Strong winds of 55 mph or more can cause significant damage even though no tornado is present.
Lightning claims more lives every year than tornadoes.
When lightning is a threat, stay indoors and don't use electrical appliances. If you're caught outside, keep a safe distance from tall objects, and try to stay lower than anything nearby. A safe distance from a tree is twice its height. Mid-afternoon through early evening is the most likely time for a tornado, but they can strike at any time. They can travel at speeds up to 70 miles per hour and contain winds estimated at over 200 miles per hour.