What is Mesolow?

A mesolow, also known as a mesocyclone low or meso-low, is a localized low-pressure system that develops within larger storm systems, such as supercells or squall lines. These small-scale pressure drops can intensify severe weather conditions, leading to the formation of strong winds, heavy rainfall, and tornadoes.

Mesolows often form along frontal boundaries or within thunderstorm complexes where temperature and wind conditions create localized instability. Because they enhance storm rotation, they are closely monitored in tornado forecasting. In some cases, mesolows can contribute to the rapid intensification of storms, increasing the risk of extreme weather events.

For storm shelter and safe room planning, understanding mesolows is crucial because they can lead to sudden and severe tornado outbreaks. Homeowners and businesses in tornado-prone areas should stay informed about weather alerts and have a shelter plan in place when a mesolow is detected in their region.