Definition
Drawn on synoptic charts at fixed intervals of atmospheric pressure reduced to mean sea level, most commonly every 4 hectopascals, though 2 or 5 hPa spacings are also used. One hectopascal equals one millibar. Isobar spacing is the primary visual cue to wind strength, while their curvature indicates cyclonic or anticyclonic flow, with winds blowing nearly parallel to them rather than across them.
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