The difference in surface wind speed between morning and afternoon is typically different on a clear, sunny day than on a cloudy, overcast day. In clear weather there is usually a _____ variation in atmospheric stability between morning and afternoon. Mornings are often characterized by a stable radiation inversion, and afternoons by a(n) _____ atmosphere and strong vertical mixing. The greater atmospheric instability on clear days tends to link surface air with the air above and produce stronger surface wind speeds. On overcast days the earth's surface does not warm as much, the atmosphere is more _____ , and much less vertical mixing occurs.

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