From Glossary of Meteorology
- A strong wind characterized by a sudden onset, a duration of the order of minutes, and then a rather sudden decrease in speed.
In U.S. observational practice, a squall is reported only if a wind speed of 16 knots or higher is sustained for at least two minutes (thereby distinguishing it from a gust).
See line squall, white squall, williwaw.
- In nautical use, a severe local storm considered as a whole, that is, winds and cloud mass and (if any) precipitation, thunder and lightning.
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