What is a severe thunderstorm?

June 10, 2008 8:20:05 AM PDT
article| David Murphy| A severe thunderstorm produces frequent lightning, locally damaging wind with gusts in at least the 50-60 mph range, or hail that is greater than ¾ inches in diameter. Any thunderstorm that produces a tornado is also thought of as severe. Severe thunderstorms are always dangerous and can cause death, injury and property damage, thanks to the strength of their winds, the frequency of their lightning or the size of the hail they produce.