How does the spacing of isobars on a weather map generally relate to the speed of wind? How does the spacing of isobars on a weather map generally relate to the speed of wind? Closely spaced isobars indicate a weak pressure gradient and low wind speeds; widely spaced isobars indicate a strong pressure gradient and high wind speeds. Closely spaced isobars indicate a weak pressure gradient and high wind speeds; widely spaced isobars indicate a strong pressure gradient and low wind speeds. Closely spaced isobars indicate a strong pressure gradient and high wind speeds; widely spaced isobars indicate a weak pressure gradient and low wind speeds. Closely spaced isobars indicate a weak pressure gradient and high wind speeds; widely spaced isobars indicate a strong pressure gradient and low wind speeds. Closely spaced isobars indicate a strong pressure gradient and high wind speeds; widely spaced isobars indicate a weak pressure gradient and no winds.