18 – 20 Test

Rain, snow, sleet and hail are all examples of…
precipitation
Which term describes the conversion of a solid directly to a gas, without passing through the liquid state?
sublimation
The change of state from a gas to a liquid is called…
condensation
Air that has reached its water-vapor capacity is said to be…
saturated
The following is NOT a process that lifts air…
divergence
Orographic lifting is associated with…
mountains
Which cloud type consists of globular cloud masses with a cauliflower structure?
cumulus
Which term is used to describe clouds in of middle height?
alto
Which clouds are often associated with thunder and lightning?
cumulonimbus
Which type of precipitation consists of small clear-to-translucent ice particles?
sleet
What type of cloud is associated with hail?
Cumulonimbus
Maritime air masses form…
over water
Which air masses have the greatest effect on weather conditions in much of the United States?
cP and mT
The boundary that separates different air masses is called a…
front
The weather behind a cold front is dominated by a…
cold air mass
Which gas is most important for understanding atmospheric processes?
water vapor
The process of which water vapor changes to a solid is called…
deposition
The ratio of air’s water-vapor content to its capacity to hold water vapor at the same temperature is the…
relative humidity
Which cloud type is best described as sheets or layers that cover much or all of the sky?
stratus
Which cloud type is confined to the middle height range?
alto-stratus
Compared to clouds, fogs are…
at lower altitudes
Which process can produce either rain or snow?
the Bergeron process
An immense body of air characterized by similar properties at any given altitude is known as an…
air mass
Which two properties characterizes an air mass?
temperature and moisture
Which type of air mass originates in northern Canada?
mP
an mT air mass is best described as…
warm and wet
A cT air mass is…
hot and dry
In figure 20-1, F =…
hot and dry & hot in the summer
Which air mass is the source of much of the precipitation in the central and eastern US?
mT
On a weather map, which type of front is shown by a line with triangular points on one side?
cold
On a weather map, which type of front is shown by a line with semicircles extending from one side?
warm
When an active cold front overtakes a warm front…
an occluded front forms
Along a front, which type of air is always forced upwards?
warmer, less dense air
What type of front usually produces several hours of light-to-moderate precipitation over a large region?
warm front
The greatest number of thunderstorms occur in the…
tropics
a rotating column of air is called a…
vortex
Tornadoes are most frequent from…
April to June
Hurricanes are classified according to intensity using the…
Saffir-Simpson scale
Typhoon id another name for…
hurricane
What scale is used to measure tornado intensity?
Fugita Tornado Intensity Scale
What is a hurricane?
A whirling cyclone that produce winds of at least 119 kilometers/hour.
What is a storm surge?
Ir is a dome of water about 60 to 90 km wide that sweeps across the coast where hurricane’s eye moves onto land.
What is relative humidity?
It is the ratio of the air’s actual water vapor content compared with the amount of water vapor air can hold at the temperature and pressure.
That are the three basic types of clouds?
Cirrus, Cumulus, Stratus
What type of atmospheric conditions are associated with cumulus clouds?
Unstable
Describe an mP air mass.
Maritime Polar; Wet and Cold
Where are the heaviest rains and fastest winds of a hurricane found?
Eye wall
Describe the formation of the four types of fronts and the weather associated with each.
Cold Front; heavy precipitation and gusty windsWarm Front; light to moderate precipitationStationary Front; gentle precipitationOccluded Front; forms when an active cold front overtakes a warm front (light precipitation)
Describe the three basic types of clouds.
Cirrus – high, white, and thin (look like feathers)Cumulus – individual cloud masses; flat bases; cauliflower structuresStratus – form sheets or layers that cover much or all of the sky