Microbursts are small, localized downdrafts usually found in thunderstorms. What is their typical diameter?

Microbursts are small, localized downdrafts usually found in thunderstorms. What is their typical diameter?

• A. 20 nautical miles
• B. 2.5 nautical miles
• C. 0.5 nautical miles
• D. 100 nautical miles

Answer: (B)

Microbursts produce a surface outflow that covers only a small area, so their wind shear risk is confined to a brief, localized footprint. The typical diameter of that outflow is about 2.5 nautical miles, which is roughly 4.6 kilometers. This size reflects why pilots must be vigilant within a few miles of a thunderstorm for sudden, strong winds. Diameters like 20 or 100 nautical miles are much too large for a microburst’s footprint, and 0.5 nautical miles is smaller than the usual, making 2.5 nautical miles the best representation of the typical size.

Microbursts produce a surface outflow that covers only a small area, so their wind shear risk is confined to a brief, localized footprint. The typical diameter of that outflow is about 2.5 nautical miles, which is roughly 4.6 kilometers. This size reflects why pilots must be vigilant within a few miles of a thunderstorm for sudden, strong winds. Diameters like 20 or 100 nautical miles are much too large for a microburst’s footprint, and 0.5 nautical miles is smaller than the usual, making 2.5 nautical miles the best representation of the typical size.