What is the minimum surface wind speed for a thunderstorm to be classified as severe?

A thunderstorm is classified as severe when it exhibits certain characteristics that pose a significant risk to aviation and ground activities. One of the key criteria for this classification is the wind speed. Specifically, a severe thunderstorm is defined as one that produces wind gusts of 58 miles per hour or greater. This 58 MPH threshold has been established by the National Weather Service and serves as an important indicator for forecasters and meteorologists in assessing the potential danger posed by such storms.

This wind speed is significant because it is high enough to potentially cause damage to structures, vehicles, trees, and can create hazardous flying conditions for aircraft. Wind speeds at or above this level can lead to intense downdrafts and outflows, which can be particularly dangerous during takeoff and landing phases of flight. Thus, recognizing a thunderstorm as severe based on this wind speed criterion is vital in ensuring safety and preparedness for both ground operations and aviation.