What causes upslope fog?
Upslope fog or hill fog forms when winds blow air up a slope (called orographic uplift). The air cools as it rises, allowing moisture in it to condense.
Where does upslope fog occur?
Upslope fog generally forms at the higher elevations and builds downward into valleys. This fog can maintain itself at higher wind speeds because of increased lift and adiabatic cooling. Upslope winds more than 10 to 12 knots usually result in stratus rather than fog.
How does radiation fog occur?
Radiation fog is a very common type of fog throughout the United States. It is most prevalent during the fall and winter. It forms overnight as the air near the ground cools and stabilizes. When this cooling causes the air to reach saturation, fog will form.
How is advection fog formed?
It forms when cold air moves over relatively much warmer water. When this occurs, water from the water’s surface evaporates and water vapor is added to the colder air. The cold air then saturates quickly and fog forms.
What kind of fog is tule fog?
radiation fog
The Central Valley’s thick tule fog is a type of radiation fog that forms on calm, clear nights, usually after a soaking rain, when the Earth gives up its heat — radiates its heat like a radiator — into space.
What conditions produce fog?
Fog is formed when air at or near the earth’s surface becomes saturated by any of the three processes – cooling, addition of moisture, or mixing with another air parcel. Generally, fog forms in a stable air mass environment.
What is an upslope?
Definition of upslope : being or moving to or toward the top of a slope : uphill upslope winds.
What is fog in radiology?
Fog in radiology refers to darkening of images by sources other than the radiation of the primary beam to which the film was exposed. This can be due to chemicals in the processing solutions, light, or non primary beam radiation. Darkroom Fog.
Why does fog form after sunrise?
The initial heating of the surface just after sunrise can create the same effect as a light wind, causing existing fog to thicken or new fog to develop.
How does an advection fog form quizlet?
Advection fog forms when warm, moist air blows into an area where the surface is cooler, causing condensation. They often form where warm ocean air blows over cooler offshore waters.
Where does tule fog occur?
Central Valley
Tule fog (/ˈtuːliː/) is a thick ground fog that settles in the San Joaquin Valley and Sacramento Valley areas of California’s Central Valley. Tule fog forms from late fall through early spring (California’s winter season) after the first significant rainfall.
What is tule fog and how is it formed?
The Central Valley’s thick tule fog is a type of radiation fog that forms on calm, clear nights, usually after a soaking rain, when the Earth gives up its heat — radiates its heat like a radiator — into space.