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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.
Under conditions of high humidity, the rate of evaporation of sweat from the skin decreases. Also, if the atmosphere is as warm or warmer than the skin during times of high humidity, blood brought to the body surface cannot dissipate heat by conduction to the air.
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]
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The “headstand” posture is caused by high humidity caused by fog conditions. Low temperatures, observed to be below 20 degrees Celsius during nocturnal fog, [ 10 ] may play a role in modulating the behaviour, but low temperatures do not seem to be capable of triggering the “headstand” posture without high humidity conditions.
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.
Get the Boydton, VA local weather forecast by the hour and the next 10 days.
In Australia, heat waves cause more fatalities than any other type of severe weather. [95] The dry conditions that may accompany heat waves can also severely affect plant life as the plants lose moisture and die. [97] Heat waves are often more severe when combined with high humidity. [96]