Foggy Canyon

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Timelapse photography reveals the tide-like motions of fog that filled the Grand Canyon last week. This unusual meteorological condition was created by a temperature inversion. Usually air near the ground is warmest and the atmosphere cools as the altitude increases. But occasionally a mass of warm air will trap a layer of cooler air beneath it. In the case of the Grand Canyon, cool foggy air was capped by a warmer air mass, resulting in a sea of fog. Depending on the conditions, temperature inversions can create other distinctive weather patterns like cloud streets or even supercell thunderstorms. (Video credit: Vox; via Flow Visualization)

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