What is Mesohigh?

A mesohigh is a localized area of high pressure that develops near the surface due to the cooling effects of precipitation, particularly in thunderstorms and mesoscale convective systems (MCS). These systems form when rain-cooled air accumulates, creating a dense, high-pressure zone that can spread outward.

Mesohighs are commonly associated with outflow boundaries, where cooler air from thunderstorms pushes outward, creating gusty winds and sudden temperature drops. These boundaries can enhance or weaken storm development, depending on atmospheric conditions.

In severe weather situations, mesohighs can influence storm movement and intensity. They often contribute to gust fronts, which are strong, surface-level winds that can cause sudden changes in weather, including dust storms or wind damage.

Understanding mesohighs is important for weather forecasting, especially when predicting storm evolution, wind shifts, and localized severe weather impacts. Their presence can signal the potential for rapid weather changes, making them a key factor in storm shelter preparedness.