Meteorology · Atmosphere & Pressure
On a surface weather chart, isobars spaced very close together indicate:
- ACalm conditions
- BWarm air aloft
- CAn area of fog
- DA steep pressure gradient and strong winds✓ Correct
Explanation
Isobars connect points of equal pressure. Tightly packed isobars mean a steep pressure gradient, which drives strong winds; widely spaced isobars indicate weak gradients and light winds.
Authority: Bowditch (Pub. No. 9)
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