What is advection fog?

Advection fog occurs over both water (e.g., steam fog) and land. (2) Radiation fog (ground or valley fog). Radiational cooling produces this type of fog. Under stable nighttime conditions, long-wave radiation is emitted by the ground; this cools the ground, which causes a temperature inversion.

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What are the two types of fog?

Advection fog forms due to moist air moving over a colder surface, and the resulting cooling of the near-surface air to below its dew-point temperature. Advection fog occurs over both water (e.g., steam fog) and land. (2) Radiation fog (ground or valley fog). Radiational cooling produces this type of fog.

What is pre-frontal fog?

Pre-frontal, or warm-frontal, fog (Figure 1-2) is the most common and often occurs over widespread areas ahead of warm fronts. •Whenever the rain temperature exceeds the wet-bulb temperature of the cold air, fog or stratus form. • Fog usually dissipates after frontal passage due to increasing temperatures and surface winds.

What are the 4 types of sea fog?

The four different types of sea fog identified in the northern Gulf are warm advection (cooling), cold advection (evaporation/steam), frontal (mixing), and radiational. Of the four types, warm advection and cold advection fog are most prevalent.

What causes fog to form?

Advection fog forms due to moist air moving over a colder surface, and the resulting cooling of the near-surface air to below its dew-point temperature. Advection fog occurs over both water (e.g., steam fog) and land. (2) Radiation fog (ground or valley fog).

What type of air is involved in sea fog?

Warm, moist air that is cooled to saturation as it moves over cold water forms sea fog: • If the initial dew point is less than the coldest water temperature, sea fog formation is unlikely. In poleward-moving air, or in air that has previously traversed a warm ocean current, the dew point is usually higher than the cold water temperature.