What is the definition of a micro-burst?

• A. A high speed upward draft of warm air
• B. A high speed down draft of cold air
• C. A slow moving cold front
• D. A type of wind phenomenon in a tornado

Answer: (B)

A micro-burst is defined as a high-speed down draft of cold air that descends rapidly from a thunderstorm and spreads out upon reaching the ground. This phenomenon is characterized by intense, localized winds that can cause significant damage in a short period. The cold air originating from the storm’s upper levels descends quickly, and when it impacts the ground, it creates outflow boundaries that can lead to strong, destructive winds.

In contrast, warm air drafts are typically associated with other weather phenomena, such as thunderstorms' updrafts, which are not characteristic of micro-bursts. A slow-moving cold front does not align with the sudden and violent nature of a micro-burst either. Additionally, while tornadoes exhibit powerful winds, tornado-related wind phenomena differ from the mechanics of a micro-burst, where the focus is specifically on the rapid down draft and resulting gusts that occur independently of tornadic activity.