Functions

• Average lightning stroke is 6 miles long
• Average thunderstorm is 6-10 miles wide
• Average thunderstorm travels at a rate of 25 miles per hour
• On average, thunder can be heard over a distance of 3-4 miles depending on humidity, terrain and other factors
• Approximately 100,000 thunderstorms occur in the United States each year.
• Approximately 10% of all thunderstorms are severe enough to produce high winds, flash floods and tornados