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Approximately 10% of thunderstorms are considered severe, which means they produce hail at least three-quarters of an inch in diameter, have winds of at least 58 miles per hour, or produce a tornado. Lightning often strikes outside of heavy rain and may occur as far as 10 miles from any rainfall. Most lightning deaths and injuries occur when people are caught outdoors in the summer months during the evening or afternoon. The chances of being struck by lightning are about 1 in 600,000. Below are tips from the National Fire Protection Association on what to do before, during and after a thunderstorm.