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Question: Why is the coldest part of the morning just before the dawn?

Answer: On a fair night with light winds and no frontal passages, the earth's surface loses heat by way of outgoing infrared radiation, and in turn cools the air in the lower atmosphere. This cooling process continues until incoming radiation from the rising sun begins to exceed the outgoing radiation, and the temperature starts to climb again. While there can be exceptions, the lowest temperature often occurs a little after sunrise as opposed to actually happening before the dawn.

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WRAL Weather on Twitter
  1. [5]Rain and more rain. May not see the sun again until Wednesday.
      — Sunday, November 22, 2009 6:27 PM
  2. [5]Forecast: Tonight, cloudy with patchy rain, with a low of 46°. Tomorrow, clouds, with a high of 53°. wral.com/weather/
      — Sunday, November 22, 2009 5:00 PM
  3. [5]Forecast: Today, mostly cloudy, with a high of 58°. Tonight, cloudy with patchy rain, with a low of 46°. wral.com/weather/
      — Sunday, November 22, 2009 6:15 AM

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