For those of you that were up by noon this past Saturday may have noticed that many concrete surfaces were wet that morning. The featured image displays two RWIS webcam images from that day along with a timeseries of air temperature, dew point, and bridge deck pavement temperature. The highlighted period during the morning shows the dew point being slightly warmer than the bridge temperature. When this happens, water vapor will condense onto the surface and that is why the concrete surfaces were wet that morning. When this process happens at temperatures below freezing, rhime and frost occur.

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