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Isobars
lines of constant pressure
A line drawn on a weather map connecting points of equal
pressure is
called an "isobar".
Isobars are generated from mean sea-level
pressure reports
and are given in millibars.
The diagram below depicts a pair of sample isobars.
At every point along the top isobar, the
pressure is 996 mb
while at every point along the bottom isobar,
the pressure is 1000 mb. Points above the 1000 mb isobar have a lower pressure
and points below that isobar have a higher pressure.
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