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Meteorology 5


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The most common way for air to be cooled in order that a cloud may form is by
rising and expanding
The formation of raindrops by collision and coalescence of smaller cloud droplets is strongly influenced by
electrical charges on the droplets
Why do clouds represent a source of heat for the atmosphere?
cloud formation releases latent heat to the air
Clouds which have extensive vertical dimensions are
The important difference between liquid droplets and ice crystals in a supercooled cloud is that ice crystals
grow much more rapidly
The cloud droplets in a cloud are formed by water vapor molecules and
condensation nuclei
Condensation nuclei may be formed from
particles of dust, nitric acid, smoke from forest fires, salt crystals from the ocean...
Dew is most likely to form on
clear calm nights
The conditions that persist along the West Coast of the U.S. that are conducive to fog formation are
moist air moving over a cold surface
Fog is usually a result of air having been
cooled or moistened
Clouds and precipitation form in the air primarily due to
air being cooled as it rises
A cloud that forms liquid droplets has a relative humidity of 100% with respect to the liquid droplets. If ice crystals form in this cloud, they will experience the cloud enviroment as having a relative humidity of
more than 100%
The process by which a cloud droplet first forms is
The water content or volume of a raindrop is approximately ______ times that of a typical cloud droplet.
1 million
Which of these is a mid-level cloud?
none listed
Which of these clouds is least likely to produce precipitation that reaches the ground?
Super cooled water is water which is
still liquid at temperatures below 0 degrees C
The necessary conditions for hail formation include strong upward vertical motion and
large numbers of supercooled droplets
What is the basic reason why condensation is not very important in causing a cloud droplet to grow to raindrop size?
condensation is too slow
Why are high altitude clouds always so thin?
very little water vapor is present
Freezing rain(ice storm) or sleet occurs when
upper air is warmand surface air is cold
Clouds that form in air that is very stable will usually be
A cumulous cloud is recognized mainly by its
obvious vertical dimension
Clouds are classified and named according to their altitude and
form or appearance
The most important process for cloud formation in the atmosphere is
cooling by expansion of the air
The word "radiation" in the term radiation fog refers to
radiant energy lost by the ground
The raindrops that fall to earth from a _warm_ cloud contain about one million times the water in a typical cloud droplet. This growth from cloud droplet to raindrop occurs _mainly_ bc of
collision and coalescence
A cloud type that develops as a consequence of local convection is
Dew point is the temperature at which water vapor in the air begins to condense. The temperature inside a cloud would therefore be
about equal to the dew point
Clouds, dew and frost all form because air has become saturated. This condition of saturation is USUALLY caused by
the air being cooled
The cloud form that is best described as sheets or layerrs that cover much or all of the sky is termed
Hail is most commonly assoiciated with
cumulonimbus clouds
A wintertime form of precipitation that consists of small ice particles is called
none listed
"Anvil head" is a term applied to
cumulonimbus clouds
This fog is found in valleys at night and in the early morning
radiation fog
When warm moist air moves over a cloud surface, ______ fog may result.
This fog results from adiabatic cooling
none listed
Which one of the fogs listed below may be catagorized as an evaporation fog?
steam fog
Cloud seeding is used
to produce precipitation, in hail suppression, to disperse fog, to disperse clouds...
Hail suppression
relies primarily on cloud seeding with silver iodide

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