The featured graph is from the Ames RWIS site for the past 24 hours. While air temperatures (red) only reached 25 degrees, pavement temperatures reached 45 degrees at a rather rapid rate. The pavement then cooled off to the air temperature late in the evening with the loss of solar heating. Then around 2 AM, there is a change in the cooling rate. This is a result of the sky clearing allowing rapid cooling. You can generate plots like these here.

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Tags:   rwis