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55 terms

MET10 M2

STUDY
PLAY
Relative humidity changes with
water vapor and temperature
Which of the following would cause relative humidity to decrease?
a. cooling the air
b. warming the air
c. increasing the air pressure
d. changing the wind direction
warming of the air
At what time of day is the relative humidity normally at a minimum?
when the air temperature is highest
If the air temperature remains constant, evaporating water into the air will ______ the dew point and ______ the relative humidity.
increase, increase
The temperature to which air must be cooled in order to become saturated is the
dew point temperature
As the difference between the air temperature and the dew point increases, the relative humidity
decreases
This instrument uses wet-bulb and dry-bulb temperatures to obtain relative humidity.
sling psychrometer
A large difference between the dry- and wet-bulb readings on a psychrometer indicates
dry conditions
Dew is most likely to form on
a.clear, calm nights.
b.cloudy, calm nights.
c.clear, windy nights.
d.cloudy, windy nights.
e.rainy nights.
clear, calm nights
The cooling of the ground to produce dew is mainly the result of
radiational cooling
Radiation fog forms best on a
a. clear winter night with no breeze.
b. cloudy winter night with a strong breeze.
c. clear summer night with a strong breeze.
d. cloudy summer night with a slight breeze.
e. cloudy winter night with a slight breeze.
clear winter night with no breeze
The fog that forms along the Pacific coastline of North America is mainly this type.
advection fog
When fog lifts above the ground it normally forms this gray sheetlike cloud.
stratus
Which association below is not correct?
a. cirrocumulus - high cloud
b. cumulus - cloud of vertical extent
c. altostratus - high cloud
d. stratus - lowcloud
altostratus - high cloud
An anvil-shaped top is most often associated with
a.cumulonimbus.
b.Stratocumulus
c.altocumulus.
d.Nimbostratus
cumulonimbus
Cirrus clouds are composed primarily of
ice particles
The cloud with the greatest vertical growth is
a.stratocumulus.
b.cumulus.
c.cumulonimbus.
d.Cirrocumulus.
e.altocumulus.
cumulonimbus
A halo around the moon means that
a.cirrostratus clouds are present.
b.the clouds overhead are low clouds.
c.rain is falling from the clouds overhead.
d.the clouds are composed of water droplets.
cirrostratus clouds are present
Light or moderate-but-steady precipitation is most often associated with ______ clouds.
a.
nimbostratus
b.
Cirrostratus
c.
Cirrocumulus
d.
cumulonimbus
nimbostratus
Which of the following clouds generally forms at the lowest altitude?

a.
Cirrostratus
b.
stratocumulus
c.
Altocumulus
d.
Cirrus
stratocumulus
The rate at which the actual air temperature changes with increasing height above the surface is referred to as the
environmental lapse rate
If an air parcel is given a small push upward and it falls back to its original position, the atmosphere is said to be
stable
If an air parcel is given a small push upward and it continues to move upward on its own accord, the atmosphere is said to be
unstable
The rate at which the temperature changes inside a rising (or descending) parcel of saturated air is called
moist adiabatic lapse rate
The dry adiabatic rate is the rate at which
a.
an air parcel rises.
b.
temperature changes in a rising or descending parcel of unsaturated air.
c.
volume changes when a parcel expands or is compressed.
d.
latent heat energy is released in a rising air parcel.
temperature changes in a rising or descending parcel of unsaturated air
A knowledge of air stability is important because
it determines the vertical motion of air
Which condition below would make a layer of air more unstable?
a. an increase in wind speed
b. lifting the entire air layer
c. cooling the upper part of the layer
d. all of the above
all of the above
Which set of conditions, working together, will make the atmosphere the most stable?
Which set of conditions, working together, will make the atmosphere the most sta-ble?
a.
cool the surface and warm the air aloft
b.
cool the surface and cool the air aloft
c.
warm the surface and cool the air aloft
d.
warm the surface and warm the air aloft
cool the surface and warm the air aloft
What two sets of conditions, working together, will make the atmosphere the most unstable?
a.
cool the surface and warm the air aloft
b.
cool the surface and cool the air aloft
c.
warm the surface and cool the air aloft
d.
warm the surface and warm the air aloft
warm the surface and cool the air aloft
Which cloud type below would most likely form in an unstable atmosphere?
a.
cumulonimbus
b.
Stratus
c.
Cirrostratus
d.
Nimbostratus
e.
Altostratus
cumulonimbus
The vertical motion of air caused by sun heating the ground is called
convection
An example of orographic clouds would be
a.
clouds forming over a warm ocean current.
b.
clouds forming on the windward slope of a mountain.
c.
clouds forming behind a jet airplane.
d.
clouds formed by surface heating.
clouds forming on the windward slope of a mountain
The name commonly used to describe the drier region observed on the downwind (leeward) side of a mountain range is
rain shadow
During the ice crystal process of rain formation (Bergeron Process)
a. only ice crystals need be present in a cloud.
b. ice crystals grow larger at the expense of the surrounding liquid cloud droplets.
c. the temperature in the cloud must be -40o C (-40o F) or below.
d. the cloud must be a cumuliform cloud.
ice crystals grow larger at the expense of the surrounding liquid cloud droplets
Which cloud type below will only produce precipitation by the collision-coalescence process?
a. a thick, warm (32F+) nimbostratus cloud
b. a thick, warm cumulus cloud
c. a thick, cold (32F-) cumulus cloud
d. a thick, supercooled cumulonimbus cloud with abundant nuclei
e. a supercooled cumulus congestus cloud
a thick, warm cumulus cloud
A raindrop which freezes before reaching the ground is called
sleet
Sea-level pressure values generally fall in the range
950 to 1050 mb
Which of the following instruments measures pressure?
a.
barometer
b.
Thermometer
c.
Radiometer
d.
hygrometer
e.
densitometer
barometer
A station at an altitude of 900 m (about 3000 feet) above sea level measures an air pressure of 930 mb. Under normal conditions, which of the values below do you think would be the most realistic sea level pressure for this station?

a. 840 mb
c. 1020 mb
b. 930 mb
d. 1830 mb
1020 mb
To correctly monitor horizontal changes in air pressure, the most important correction for a mercury barometer measurement is the correction for
temperature
A _______ usually indicates clearing weather or fair weather.
steadily rising pressure
Lines connecting points of equal pressure are called
isobars
The _______ is an apparent force created by the earth's rotation.
Coriolis force
The force that would cause a stationary parcel of air to begin to move horizontally is called the
pressure gradient force
Surface winds blow across the isobars at an angle due to
the frictional force
Cyclonic flow means _______ in either the Northern or Southern Hemisphere.
a.
clockwise wind flow
b.
counterclockwise flow
c.
circulation around a low pressure center
d.
circulation around a high pressure center
circulation around a low pressure center
We can generally expect the air to be _______ above areas of surface low pressure and _______ above areas of surface high pressure.
rising, sinking
The surface air around a strengthening low pressure area normally ______ , while, above the system, the air normally_______
converges, diverges
The wind around a surface high pressure center in the Northern Hemisphere blows
a.
counterclockwise and outward from the center.
b.
counterclockwise and inward toward the center.
c.
clockwise and outward from the center.
d.
clockwise and inward toward the center.
clockwise and outward from the center
An instrument used to measure wind speed is called a(an)
anemometer
The great Mississippi River flood - documented in the NOVA video "Flood" - occurred in what year?
1993
It is possible to have more than one "hundred year flood" in a hundred years.
True
People have contributed to the rising cost of floods along the Mississippi River by building their homes in the Mississippi River flood plain.
True
The Mississippi River flood was caused by a shift in the normal path of the Jet Stream which caused almost continuous precipitation over the Mississippi River watershed.
True
The great Mississippi River flood was the worst flood in recorded American history.
True