Seems to me that we need a meteorologist.  As I vaguely recall from instrument
flight training, an isotherm is the plot of constant temperature and an isobar
is the plot of continuous pressure (usually measured in milibars above msl).
You can see either (or both) at your local weather channel.  The two are
frequently geographically colocated, and when not colocated are indicative of
weather which one should fly around and not through.   Just a vague
recollection from a former life.  Regards, Jim Moffitt

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