Life Cycle of a Thunderstorm Developing Stage Towering cumulus cloud indicates rising air. Usually little if any rain during this stage. Lasts about 10 minutes. Occasional lightning during this stage. Most likely time for hail, heavy rain, frequent lightning, strong winds, and tornadoes.
Storm occasionally has a black or dark green appearance.
Lasts an average of 10 to 20 minutes but may last much longer in some storms. Dissipating Stage Rainfall decreases in intensity. Some thunderstorms produce a burst of strong winds during this stage. Lightning remains a danger during this stage. Thunderstorms are most likely to happen in the spring and summer months and during the afternoon and evening hours but can occur year-round and at all hours.