Severe thunderstorms can bring hail of at least 1 inch in diameter, wind gusts of 58 mph (93 km/h) or higher, and even tornadoes. A warning indicates that these hazards are already occurring or imminent, posing a significant risk to life and property. Lightning, although not a criterion for severe storms, remains a deadly threat, capable of striking up to 15 miles from a storm's center. The NWS reports that lightning kills about 20 people annually in the U.S. and injures hundreds more. Even in the absence of a watch or warning, thunderstorms with lightning can still be dangerous.