Meteorology · Thunderstorms — Downburst / Microburst
A microburst from a thunderstorm is dangerous to vessels because it produces:
- AA long period of calm
- BA sudden, strong downdraft that spreads out as violent, shifting surface winds✓ Correct
- COnly light drizzle
- DA steady gentle breeze
Explanation
A downburst/microburst is a concentrated column of sinking air that hits the surface and blasts outward as sudden, powerful, rapidly shifting winds — capable of knocking down sailing vessels and small craft with little warning. The gust front ahead of a storm gives some advance sign.
Authority: NWS; convective weather
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