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So, the cyclostrophic speed is determined by the magnitude of the pressure gradient across the trajectory and by the radius of curvature of the isobar.
en.wikipedia.org This flow of air across the isobars near ground level is a "secondary flow".
en.wikipedia.org Recall that the cyclostrophic trajectory was found to be an isobar.
en.wikipedia.org If it is not marked, troughs may still be identified as an extension of isobars away from a low pressure center.
en.wikipedia.org There is a strong pressure gradient across the isobars toward the center of the cyclone.
en.wikipedia.org