The diameter of a microburst is defined as 2.5 miles or less.

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Multiple Choice

The diameter of a microburst is defined as 2.5 miles or less.

Explanation:
Microbursts are defined by their tiny, intense footprint on the ground. The established boundary is a diameter of 2.5 miles or less, which keeps the event within the small-scale category. Any diameter larger than 2.5 miles is considered a macroburst, not a microburst. So the phrasing that matches this limit exactly is “2.5 miles or less.” Smaller bounds describe subsets of microbursts and don’t capture the official threshold, while a bound like 3.0 miles or less would include larger events and blur the micro/macro distinction.

Microbursts are defined by their tiny, intense footprint on the ground. The established boundary is a diameter of 2.5 miles or less, which keeps the event within the small-scale category. Any diameter larger than 2.5 miles is considered a macroburst, not a microburst. So the phrasing that matches this limit exactly is “2.5 miles or less.” Smaller bounds describe subsets of microbursts and don’t capture the official threshold, while a bound like 3.0 miles or less would include larger events and blur the micro/macro distinction.

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