valley fog at sunrise ...

fog -- is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. this fog is lifting above the river. Fog can be considered a type of low-lying cloud usually resembling stratus, and is heavily influenced by nearby bodies of water, topography, and wind conditions. In turn, fog has affected many human activities, such as shipping, travel, and warfare. Valley fog forms in mountain valleys, often during winter. It is essentially a radiation fog confined by local topography, and can last for several days in calm conditions.

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