7.8 Temperature/Dew Point and Fog
Clouds, fog, or dew will always form when a) water vapor condenses b) water vapor is present c) relative humidity reaches 100 percent
A
What are the processes by which moisture is added to unsaturated air? a) Evaporation and sublimation b) Heating and condensation c) supersaturation and evaporation
A
What situation is most conducive to the formation of radiation fog? a) Warm, moist air over low, flatland areas on clear, calm nights b) Moist, tropical air moving over cold, offshore water c) The movement of cold air over much warmer water
A
In which situation is advection fog most likely to form? a) A warm, moist air mass on the windward side of mountains b) An air mass moving inland from the coast in winter c) A light breeze blowing colder air out to sea
B
The amount of water vapor which air can hold depends on the a) dewpoint b) air temperature c) stability of the air
B
Which conditions result in the formation of frost? a) The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface b) The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing c) The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface
B
If the temperature/dewpoint spread is small and decreasing, and the temperature is 62 degrees F, what type weather is most likely to develop? a) freezing precipitaiton b) Thunderstorms c) for or low clouds
C
Low-level turbulence can occur and icing can become hazardous in which type of fog? a) Rain-induced fog b) Upslope fog c) steam fog
C
What is meant by the term "dewpoint"? a) The temperature at which condensation and evaporation are equal b) The temperature at which dew will always form c) The temperature to which air must be cooled to become saturated
C
What types of fog depend upon wind in order to exist? a) radiation fog and ice fog b) steam fog and ground fog c) advection fog and upslope fog
C
