The featured chart presents a simple analysis of average wind speeds by hour of the day for Ames for three periods covering November and the first half of December. All three periods show a clear diurnal signal with peak speeds coincident with peak net heating of the day with rapid ramps up in the morning and down in the evening. The overall afternoon trend is for decreasing speeds as solar heating decreases, which decreases mixing, and weaker temperature gradients. You can generate this chart for a location of your choice and arbitrary time periods of your choice to make similar comparisons elsewhere.

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