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Rain before seven, clear by eleven. Late-night rains and early morning rains may simply be the last precipitation of a passing weather front. However, since fronts pass at night as often as they do in the day, morning rain is no predictor of a dry afternoon. However, this lore can describe non-frontal weather.
Not only has the fog season shortened, lasting from June to September instead of from May to October, but the hours per day there is fog has shortened by about three hours. The attribution of the reduction in fog and of global warming itself to the Pacific decadal oscillation is generally rejected. [15]
Fog is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. [1] [2] 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.
Inversion-created smog in Nowa Ruda, Poland, 2017 Temperature inversion phenomenon in the early morning near Tawau, Sabah, Malaysia where smoke that was emitted from an oil palm mill stayed close to the ground. The wind carried the smoke in the direction of the nearby settlement to the middle-right of the photo (August 2023).
Tule fog is a radiation fog, which condenses when there is a high relative humidity (typically after a heavy rain), calm winds, and rapid cooling during the night. The nights are longer in the winter months, which allows an extended period of ground cooling, and thereby a pronounced temperature inversion at a low altitude.
Another way fog forms in deserts occurs when a desert is close to an ocean which has a cold current. When air is heated over desert land and blows towards the cool water in the ocean, it condenses and fog is formed. The cool fog is then blown inland by the ocean breeze. Fog is mainly formed in the early morning or after sunset. [5]
[citation needed] One main difference between mist and fog is visibility. [1] The phenomenon is called fog if the visibility is 1 km (1,100 yd) or less. In the United Kingdom, the definition of fog is visibility less than 100 m (330 ft) on the surface for driving purposes, [2] while for pilots the distance is 1 km at cruising height. Otherwise ...
The word stratus comes from the Latin prefix Strato-, meaning "layer". [3] Stratus clouds may produce a light drizzle or a small amount of snow. These clouds are essentially above-ground fog formed either through the lifting of morning fog or through cold air moving at low altitudes. Some call these clouds "high fog" for their fog-like form.