The gradient wind speed can be estimated from isobar spacing on a synoptic chart. What does very closely spaced isobars indicate?
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A
Strong winds — tightly packed isobars indicate a steep pressure gradient and high wind speeds
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B
Light winds — closely spaced isobars mean stable air
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C
Fog — closely spaced isobars indicate humidity
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D
Rain — closely packed isobars are found only in frontal rain bands