A squall is when there is a sudden, long lasting , increase of wind speed -
often lasting for several minutes or more. Most commonly encountered in cold
fronts, troughs and vigorous convection and are caused by the cold air
outflow from cumulonimbus clouds.

There's a much more detailed definition in the usw FAQ & glossary.

Line squalls are caused by cumulonimbus clouds in lines and occur over a
wider area.

Les


"J" wrote in message
...
Hi,

Can anyone illuminate me as to the meteorological definition of a squall
such that it warrants inclusion as "SQ"


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