What is a microburst?

• A. A strong downward and outward force of air that's a result of thunderstorms.
• B. A sudden increase in humidity with calm winds.
• C. A stationary air mass over a region.
• D. A small, brief gust of wind with no thunderstorm involvement.

Answer: (A)

A microburst is a powerful, localized downdraft from a thunderstorm that reaches the ground and spreads outward in all directions. This downward rush of air, intensified by cooling and evaporation of precipitation, creates very strong surface winds and can produce dangerous wind shear—especially for aircraft during takeoff or landing. That’s why the description of a strong downward and outward force of air caused by thunderstorms is the correct match.

The other scenarios don’t fit because humidity spikes with calm winds aren’t tied to violent wind events, a stationary air mass describes little to no movement, and a small gust with no thunderstorm involvement ignores the convective source that drives microbursts.