What type of fog forms in valleys at night

Keeping the above in mind, if there is water body at the bottom of a valley, most of the time it will be relatively warmer than the air in the valley during fall. Molecules from the water body are always evaporating, putting moisture in the air. The warmer the water body, the more evaporation of water and the more moisture present in the air.

If a cool, calm, and clear night comes, and the air temperature approaches the dew point temperature, fog will begin to form. The picture above is that of fog developing over a river in a valley. After fog develops over night, it usually persists until sun rises, afterwards it begins to dissipate. When the sun rises, the energy from the sun begins to warm the ground surrounding the fog, and the top layer of the fog. This is a picture of valley fog in the morning.

This causes the air molecules at the ground surrounding the fog to become relatively warm. This warming of the air causes the air around the perimeter of the fog to rise. Energy from the sun is able to warm the top layers of the fog which causes the air temperature in those layers to increase. The air temperature increases away from the dew point temperature, and causes the fog to start evaporating.

Eventually the fog evaporates. This picture above shows a valley fog in the morning evaporating as the sun rises. What the astronomy student observed that night is very familiar to residents of valleys around the world. These residents can come out there homes during the night and find that fog has formed on cool, clear, and calm night.

Depending on the amount of moisture in the air, fog that forms can grow very dense. Then as the sun rises, fog usually evaporates.

Valley Fog. The main types of fog are: Radiation fog Radiation fog usually occurs in the winter, aided by clear skies and calm conditions. Valley fog Valley fog forms where cold dense air settles into the lower parts of a valley, condensing and forming fog.

Advection fog Advection fog occurs when moist, warm air passes over a colder surface and is cooled. Upslope fog Upslope fog or hill fog forms when winds blow air up a slope called orographic uplift. Evaporation fog Evaporation fog is caused by cold air passing over warmer water or moist land. It can happen when: Cold air moves over heated outdoor swimming pools or hot tubs, where steam fog easily forms. Cold fronts or cool air masses move over warm seas.

This often occurs in autumn when sea temperatures are still relatively warm after the summer, but the air is already starting to cool. You might also like. Fog, mist and haze all affect visibility, which is an important part of forecasts affecting many aspects of life, from driving conditions to shipping and aviation.

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