Advice on how to prepare for a severe thunder storm and how to respond afterwards. A thunderstorm is considered sever if it produces hail at least 1 inch in diameter or has wind gusts of at least 58 miles per hour. Every thunderstorm produces lightning, which kills more people each year than tornadoes or hurricanes. Heavy rain from thunderstorms can cause flash flooding and high winds can damage homes and blow down trees and utility poles, causing widespread power outages.Know the Difference Severe Thunderstorm Watch—Severe thunderstorms are possible in and near the watch area. Stay informed and be ready to act if […]