Every thunderstorm has lightning.
In fact there are more than 40 million lightning strikes every year in the contiguous United States, with more than 100 fatalities due to lightning. Here in Colorado, lightning is the number one life threatening weather hazard. In the past 10 years there have been an average of 3 fatalities and 15 injuries reported each year from lightning. The toll may be worse, as recent studies have shown that many lightning accidents are not reported. Lightning heats the surrounding air to 50,000 degrees.