What a nice weekend! The featured image is from Saturday showing solar radiation, 4 inch soil temps, and air temperature from the Ames ISUAG site. The three curves are smooth since we had clear skies and no surface front passage. The three variables plotted tend to vary as a sinusoidal function that correlates with the incidence angle of the sun. The plot also nicely illustrates the difference in warming and cooling rates of the soil versus air.

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