According to USA TODAY, the difference between isolated and scattered thunderstorms is determined by the probability of precipitation. If the chance of precipitation is less than 30 percent, then the National Weather Ser... More » Science Weather & Tides Storms

Hailstorms occur anywhere thunderstorms do, but in the United States, they occur with the greatest frequency in the southern and central-plains states. "Hail alley," an area lying predominantly within the states of Texas... More »

Tornadoes form out of thunderstorms, where moist air rises, cools and condenses into clouds that release heat and force cooler air back down. If the updrafts are strong enough, the feedback loop forms an air vortex that ... More »

Types of storms include blizzards, hail storms, heavy rain storms, ice storms, lightning storms and thunderstorms. Each type of storm requires a certain level of preparation to keep people and animals safe and minimize d... More »

Hurricane Katrina started in the Bahamas initially as an area of thunderstorms. On August 23, 2005, this was upgraded to a tropical depression, meaning that it had become more organized as a storm. More » Science Weather & Tides Storms

Thunderstorms and tornadoes are related because tornadoes always form out of thunderstorms. Specifically, tornadoes develop when there's a steady upward flow of warm air, which is generally lower in pressure than cool ai... More »

Most tornadoes are created as a result of thunderstorms that form at the meeting point between humid air from the Gulf of Mexico and dry, cooler air from Canada. At that point, instability occurs in the atmosphere, and a... More »