Squall

Science / Weather / Squall: A sudden onset of strong winds with speeds increasing to at least 16 knots (18 miles per hour) and sustained at 22 or more knots (25 miles per hour) for at least one minute. The intensity and duration is longer than that of a gust. It is reported as 'SQ's in an observation and on the METAR.

Snow Squall

Science / Weather / Snow Squall: A heavy snow shower accompanied by sudden strong winds, or a squall. MORE

Pre-Frontal Squall Line

Science / Weather / Pre-Frontal Squall Line: A line of thunderstorms that precedes an advancing cold front. MORE

Squall Line

Science / Weather / Squall Line: A narrow band or line of active thunderstorms that is not associated with a cold front. It may form from an outflow boundary or the leading edge of a mesohigh. MORE

Wind

Science / Weather / Wind: Air that flows in relation to the earth's surface, generally horizontally. There are four areas of wind that are measured: direction, speed, character (gusts and squalls), and shifts. Surface winds ar MORE

Mesohigh

Science / Weather / Mesohigh: A small, concentrated area of high pressure that may be created by the cold outflow and rain-cooled air from thunderstorms. It often forms a pseudo cold front or squall line on its leading edges. MORE

Cold Front

Science / Weather / Cold Front: The leading edge of an advancing cold air mass that is under running and displacing the warmer air in its path. Generally, with the passage of a cold front, the temperature and humidity decrease, the MORE

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