how is fog formed ?
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Fog forms when the difference between air temperature and dew point is less than 2.5 °C (4.5 °F). Fog begins to form when water vapor condenses into tiny liquid water droplets that are suspended in the air.
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Fog forms often near creeks, waterways and river valleys as the water increases the humidity in the air. Fog is most likely to occur when the dewpoint level is very near the current temperature reading, being no more than 5 degrees F. difference. Fog evaporates after sunrise as the sun warms the fog from the top down.
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