Definition
Defined meteorologically as a rise in wind speed of at least 16 knots, reaching 22 knots or more and lasting at least one minute, distinguishing it from a gust. Squalls accompany cumulonimbus, cold fronts and troughs, and bring a marked veer in the Northern Hemisphere. Radar shows them as discrete echoes, giving useful warning at night; the wind usually falls light immediately ahead of the cloud before the squall strikes.
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