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Regulations#1. The radiation fog forms due to
Radiation fog forms at night when the earth’s heat radiates away, cooling the air near the ground below its dew point. With a light wind, fog develops; in calm conditions, only dew forms. The fog is usually a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Increases terrestrial radiation.
High relative humidity: Allows condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeps droplets suspended, and brings warmer air into contact with the cold ground.
#2. Advection fog forms during
Advection fog forms when warm, moist air moves over a cold surface, such as land or sea, and can occur at any time of day.
#3. Thermal processes/temperature distribution which favours formation of fog is
An important factor is terrestrial radiation. The ground cools rapidly, leading to an inversion where temperatures increase with height.
#4. Warm and moist air moving over a cold ground gives rise to:
below its dew point. With a light wind, fog develops; in calm conditions, only dew forms. The fog is usually only a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Increases terrestrial radiation.
High relative humidity: Allows for condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeps droplets suspended, and brings warmer air into contact with the cold ground.
A strong wind can lift the fog, forming stratus clouds.
#5. The radiation fog forms over
Radiation fog forms at night when the earth’s heat radiates away, cooling the air near the ground below its dew point. Fog develops with a light wind; in calm conditions, only dew forms. The fog is usually a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Enhances terrestrial cooling.
High relative humidity: Allows condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeps droplets suspended, and brings warmer air into contact with the cold ground.
In India, radiation fog typically forms after a western disturbance, which occurs from December to February in northern India.
#6. Advection fog forms
Advection fog forms when warm, moist air moves over a cold surface, such as land or sea.
#7. Radiation Fog forms over N India during
Radiation fog forms when the earth’s heat radiates away at night, cooling the air near the ground below its dew point. With a light wind, fog will form; in calm conditions, only dew will appear. The fog is typically only a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Enhances terrestrial radiation.
High relative humidity: Enables condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeping droplets suspended and bringing warmer air into contact with the cold ground.
In India, radiation fog commonly forms after a western disturbance, which occurs from December to February in northern India.
#8. Frontal Fog is more common with a
Frontal fog occurs at a warm front or occlusion, mainly due to precipitation lowering the cloud base to the ground.
Additional causes include:
Evaporation of standing water on the ground.
Mixing of saturated air with unsaturated air below.
The fog can form in a belt up to 200 nautical miles wide and moves with the front, potentially increasing with orographic lifting and dispersing as the front passes.
#9. Warm and moist air moving over a cold surface causes
Advection fog forms when warm, moist air moves over a cold surface, which can be either land or sea.
#10. The _____ fog forms due to horizontal movement of warm moist air over cold surface
Advection fog forms when warm, moist air moves over a cold surface, which can be either land or sea.
#11. The radiation fog activity increases after the passage of a
Radiation fog forms at night when the earth’s heat radiates away, cooling the air near the ground below its dew point. With a light wind, fog will develop; in calm conditions, only dew forms. The fog is typically a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Enhances terrestrial radiation.
High relative humidity: Facilitates condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeping droplets suspended and allowing warmer air to contact the cold ground.
In India, radiation fog often forms after a western disturbance, which occurs from December to February in northern India.
#12. For formation of Radiation fog
Radiation fog forms at night when the Earth’s heat radiates away, cooling the air in contact with the ground to below the dew point. If there’s a light wind (2–8 knots), fog will form; otherwise, dew will appear. This fog is usually only a few hundred feet thick.
Conditions for radiation fog:
Clear sky: Increases terrestrial radiation.
High relative humidity: Ensures that cooling causes saturation and condensation.
Light wind: Mixes air layers, keeping droplets suspended and bringing warmer air in contact with the cold ground to thicken the fog.
In India, radiation fog typically forms after a western disturbance, which occurs from December to February in northern India.
#13. Radiation fog occurs
Radiation fog forms when the earth’s heat radiates away at night, cooling the air near the ground below its dew point. With a light wind, fog will develop; in calm conditions, dew forms instead. It is typically only a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Enhances terrestrial radiation.
High relative humidity: Allows for condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeps droplets suspended, and brings warmer air into contact with the cold ground.
#14. The favourable pressure system for formation of fog is
In high-pressure and col areas with light winds, fog can persist. However, strong winds will dissipate the fog.
#15. Fog is ______ cloud on ground
A strong wind after radiation fog forms can lead to the development of stratus clouds, also known as low-level clouds.
#16. Radiation fog is essentially a ______ phenomena
Radiation fog forms at night when the earth’s heat radiates away, cooling the air near the ground below its dew point. Fog will form with a light wind, while calm conditions will only produce dew. The fog is usually a few hundred feet thick.
Conditions for radiation fog include:
Clear sky: Increases terrestrial radiation.
High relative humidity: Enables condensation with minimal cooling.
Light wind (2-8 knots): Mixes air layers, keeps droplets suspended, and brings warmer air into contact with the cold ground.
In India, radiation fog often occurs after a western disturbance, which happens from December to February in northern India.
#17. Instrument used for measuring visibility is called
Transmissometer
A transmissometer is an electronic device that measures the intensity of light detected by a photoelectric cell to indicate daytime visibility. It provides constant visibility measurements but, like the Gold Meter, samples only a small portion of the atmosphere.
#18. Fog is reported when visibility is reduced to
#19. RVR is reported when visibility falls below
RVR is the maximum distance a pilot 15 feet above the runway can see marker boards during the day or runway lights at night when taking off or landing. It is reported when visibility is 1500 meters or less or when shallow fog is present or forecasted.
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