This is a great question that does not get asked enough. The definition of a severe thunderstorm is any thunderstorm that produces hail of 3/4" in diameter or greater, and/or has winds at 58 miles per hour or greater.

Many people think that the amount of lightning in a storm can play a factor in weather or not a storm is severe. This is not the case. Lightning is not a prerequisite.

Here is my disclaimer: Even though a thunderstorm may not have the attributes to be considered "severe", they should be taken seriously. Any thunderstorm has the potential to do damage!

Ray Petelin,
WSEE Storm Team Meteorologist