A Severe Thunderstorm Watch means weather conditions are such that a severe thunderstorm could develop, but has not at this time. A Severe Thunderstorm Warning means a severe thunderstorm has developed and will probably affect those areas stated in the alert message. A Tornado Watch means weather conditions are such that a tornado could develop, but has not at this time. A Tornado Warning means a tornado has formed and was indicated by weather radar or sighted, and may affect those areas stated in the alert. Although thunder- storms can occur during any month, the more violent storms occur in the Spring and Summer months.
Thunderstorms can be single cell, multicell cluster, multicell line, and super cell.
Supercells always form severe thunderstorms. Thunderstorms typically consist of very high winds, rain, lightning, and in many cases hail. Typically the larger the hail is, the stronger the thunderstorm is. Tornado formation is most likely to occur where the hail falls. Another dangerous aspect of a thunderstorm is lightning.