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For example, if you look at the current Significant
Weather chart
http://www.av8n.com/fly/sigwx0000-28jun10.gif
you can see big blue capital H symbols, representing
high pressure.
To a first approximation:
Surface low pressure areas tend to pull themselves
together, resulting in tight, almost pointlike cyclones
and sharp, almost one-dimensional weather fronts,
hence strong winds. They are associated with rising
air, hence clouds and bad weather.
Surface high pressure areas tend to spread out, so
they tend to be large and diffuse, with light winds.
They are associated with descending air, hence clear
skies. They are of more interest to weather mavens
than to the general public.