What characterizes a severe thunderstorm?

A severe thunderstorm is characterized by specific criteria that indicate its intensity and potential for causing significant weather-related hazards. The combination of a surface wind of 58 MPH or greater and the presence of hail measuring 3/4 inch or more in diameter both contribute to defining a severe thunderstorm.

When winds reach 58 MPH or greater, they can lead to dangerous conditions, including uprooted trees, damaged structures, and increased likelihood of producing tornadoes. Additionally, hail of at least 3/4 inch in diameter can cause serious damage to vehicles, crops, and can even pose injury risks to individuals caught outside during the storm.

Thus, the correct answer includes both elements, as they collectively represent the criteria that meteorologists use to classify a thunderstorm as severe. This classification helps in issuing warnings and alerts to ensure public safety during potentially hazardous weather events.