Which statement about microbursts is accurate?

Which statement about microbursts is accurate?

• A. They involve a strong downward and outward air flow from thunderstorms.
• B. They only involve downward air with no horizontal movement.
• C. They occur only at night.
• D. They last several hours.

Answer: (A)

Microbursts are intense, small-scale downdrafts that occur in or beneath thunderstorms. As the air rushes downward, it hits the ground and spreads outward rapidly in all directions, creating a strong outward flow of air at the surface. This combination of a violent downward motion followed by a rapid horizontal outflow is what makes a microburst hazardous and is the defining feature of the phenomenon. They are short-lived, typically lasting seconds to a couple of minutes, and can occur any time thunderstorms are present, not just at night. That outward surface wind is why the statement about horizontal movement is correct—the air doesn’t just fall straight down; it fans out at ground level. The other points aren’t accurate: microbursts aren’t restricted to nighttime, and they don’t persist for hours.

Microbursts are intense, small-scale downdrafts that occur in or beneath thunderstorms. As the air rushes downward, it hits the ground and spreads outward rapidly in all directions, creating a strong outward flow of air at the surface. This combination of a violent downward motion followed by a rapid horizontal outflow is what makes a microburst hazardous and is the defining feature of the phenomenon. They are short-lived, typically lasting seconds to a couple of minutes, and can occur any time thunderstorms are present, not just at night.

That outward surface wind is why the statement about horizontal movement is correct—the air doesn’t just fall straight down; it fans out at ground level. The other points aren’t accurate: microbursts aren’t restricted to nighttime, and they don’t persist for hours.