What is Outflow?

Outflow is the movement of air that spreads outward from a storm system, often occurring at the surface or in the upper atmosphere. It plays a crucial role in storm development and dissipation, affecting tornado formation, thunderstorm longevity, and overall storm intensity.

In severe weather, outflow boundaries—created by cooled air rushing out of a storm—can trigger new storm development when they collide with warm, unstable air. This process is common in areas prone to tornadoes and severe thunderstorms.

Outflow can also influence wind speeds near storm shelters and safe rooms. Strong outflow winds can cause debris movement, making it important to have a well-secured shelter during severe weather.

While outflow can contribute to storm weakening by cutting off the storm’s warm air supply, it can also generate dangerous straight-line winds that pose risks to homes and businesses. Understanding outflow patterns is key to predicting severe weather behavior and ensuring proper storm preparedness.