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Means reflectivity. Thick clouds do this more.

radiation fog

Produced by the ground cooling. Clear nights with moist air overlain by drier air. Ground cools rapidly because shallow moist air doesn't absorb much IR. Air then cools rapidly.

surface inversion

When cooler air is at the surface and warmer air is above it.

What type of fog forms in a valley?

radiation fog

advection fog

When warm air moves over a significantly colder surface. Air is cooled to the dewpoint temperature.

advection-radiation fog

Fog that forms as relatively warm, moist air moves over a colder surface that cooled mainly by radiational cooling.

evaporation (mixing) fog

Fog produced by increased water vapor due to evaporation, and moist air mixes with relatively drier air.

steam fog

Mixing fog (evaporation) that forms when cold air moves over warm air (hot tub.)

frontal fog

Mixing fog that forms as wrm raindrops evaporate in a cool air mass.


Detect infrared radiation. These instruments can be used to indicate cloud height. Cloud temperature is a good indication of height.

Why is cloud altitude difficult to detect from an arial photograph.

Clouds reflect light (albedo)


As air cools overnight, condensation occurs on the ground.

frozen dew

Forms when air temperature drops to freezing or below.


Air at or below freezing. Water changes directly to ice without becoming a liquid first.

dry haze

Dust or salt scatter sunlight. Looks bluish or yellowish

wet haze

Condensation on particles increases scattering of sunlight. Looks like a thin, white veil over horizon.


A cloud resting near the ground.

Describe fog "burn off"

Sunlight penetrates through fog. Warms the ground. Increases temperature of foggy air and some water evaporates. This clears fog. Clearer fog causes more sunlight to penetrate.

Where is the largest concentration of condensation nuclei found?

Near the Earth's surface.

Which restricts visibility more? Wet haze or dry haze?

Wet haze

Which is thicker, fog forming in dirty air or fog forming in clean air?

Dirty air


Means high fog

If a fog is forming in Denver, Colorado, and the wind is blowing east, then the fog is due to

Upslope fog because of the mountains to the west.

Where would you see cirrus clouds at a lower altitude (3,000m)?


What type of cloud is an altostratus cloud?

Middle cloud

What type of cloud is a cirrocumulus?

High cloud

What type of cloud is a cumulonimbus?

Cloud with vertical development

Which type of cloud is associated with a "mackerel sky?"


What is an undulatus?

The parallel waves of clouds of an altocumulus

What is another name for a "nacreous cloud?"

Mother of pearl cloud


Attracts water (salt)


Repells water

Fog forms near surface water because the water near the coast of the Pacific is ___________ than the water farther offshore.


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