What is an Inflow Notch?

An inflow notch is a radar feature that appears as a concave or V-shaped indentation along the edge of a storm, typically near the updraft region. This notch forms due to strong inflow winds being pulled into the storm, supplying warm, moist air that fuels severe weather development.

Meteorologists use inflow notches as an early indicator of tornado potential. When a storm exhibits a well-defined inflow notch, it suggests strong rotation and an organized updraft, increasing the likelihood of tornado formation. These features are commonly observed on radar in supercell thunderstorms, where rotation is critical for tornado development.

For storm shelter and tornado safety planning, recognizing an inflow notch is essential. If a storm with an inflow notch is approaching, it can rapidly intensify, requiring immediate action to seek shelter in a safe room or underground storm shelter.

Understanding inflow notches helps meteorologists issue timely warnings and allows individuals in tornado-prone areas to take necessary precautions before dangerous weather strikes.