WX 201 Exam 3 with correct Answers
The contour lines drawn on a 500 mb chart are lines of constant
height
The unit of pressure most commonly found on a surface weather map is
millibars or hectopascals
Isobaric surfaces are ____ in warm, less-dense air and ____in cold, more-dense air.
higher; lower
Because of friction, surface winds move ____ winds aloft with the same pressure gradient.
more slowly than
The pressure gradient force is directed from higher pressure toward lower pressure
at all places on Earth
A geostrophic wind is a wind that results from a balance between the ____ force and the ____ force.
Coriolis; pressure gradient
Which pressure unit is most commonly used in aviation?
inches of mercury
On an isobaric surface,
pressure is constant.
Surface winds blow across isobars at an angle and the pressure gradient force is balanced by the ____
force and the Coriolis force.
frictional
There is always a strong pressure gradient force directed _________.
upward
The Coriolis force acts at a ____ degree angle to the wind.
90
The surface pressures at the bases of warm and cold columns of air are equal. Air pressure in the
warm column of air will ____ with increasing height ____ in the cold column.
decrease; more slowly than
A station at an altitude of 900 m (about 3,000 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
1,020 mb
, Meridional wind-flow patterns go
from either north-to-south or south-to-north.
The amount of pressure change that occurs over a given horizontal distance is called the
pressure gradient.
Net convergence of air would cause surface pressure to ____ and net divergence would cause surface
pressure to ____.
increase; decrease
If upper-level divergence exceeds surface convergence, the air pressure at the center of the surface
low will
decrease
On a 500 millibar chart, ____ are drawn to represent horizontal changes in altitude which correspond
to horizontal changes in pressure.
contour lines
Pressure changes
more rapidly in the vertical direction than in the horizontal.
Which of the following produces the strongest Coriolis force?
fast winds; high latitude
In the tropics, pressure rises and falls in a regular pattern ____ a day.
twice
What is considered standard sea-level atmospheric pressure in millibars?
1013.25 mb
The ____ force is an apparent force created by Earth's rotation.
Coriolis
The wind around a surface high pressure center in the Northern Hemisphere blows
clockwise and outward from the center
In an aneroid barometer, a general rule is that the higher the reading, the more likely ____ weather
will occur, and the lower the reading, the better the chances are for ____ weather
clear; inclement
Horizontal pressure variations cause air to move from areas of _____ pressure to areas of ____
pressure.
high; low
The contour lines drawn on a 500 mb chart are lines of constant
height
The unit of pressure most commonly found on a surface weather map is
millibars or hectopascals
Isobaric surfaces are ____ in warm, less-dense air and ____in cold, more-dense air.
higher; lower
Because of friction, surface winds move ____ winds aloft with the same pressure gradient.
more slowly than
The pressure gradient force is directed from higher pressure toward lower pressure
at all places on Earth
A geostrophic wind is a wind that results from a balance between the ____ force and the ____ force.
Coriolis; pressure gradient
Which pressure unit is most commonly used in aviation?
inches of mercury
On an isobaric surface,
pressure is constant.
Surface winds blow across isobars at an angle and the pressure gradient force is balanced by the ____
force and the Coriolis force.
frictional
There is always a strong pressure gradient force directed _________.
upward
The Coriolis force acts at a ____ degree angle to the wind.
90
The surface pressures at the bases of warm and cold columns of air are equal. Air pressure in the
warm column of air will ____ with increasing height ____ in the cold column.
decrease; more slowly than
A station at an altitude of 900 m (about 3,000 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
1,020 mb
, Meridional wind-flow patterns go
from either north-to-south or south-to-north.
The amount of pressure change that occurs over a given horizontal distance is called the
pressure gradient.
Net convergence of air would cause surface pressure to ____ and net divergence would cause surface
pressure to ____.
increase; decrease
If upper-level divergence exceeds surface convergence, the air pressure at the center of the surface
low will
decrease
On a 500 millibar chart, ____ are drawn to represent horizontal changes in altitude which correspond
to horizontal changes in pressure.
contour lines
Pressure changes
more rapidly in the vertical direction than in the horizontal.
Which of the following produces the strongest Coriolis force?
fast winds; high latitude
In the tropics, pressure rises and falls in a regular pattern ____ a day.
twice
What is considered standard sea-level atmospheric pressure in millibars?
1013.25 mb
The ____ force is an apparent force created by Earth's rotation.
Coriolis
The wind around a surface high pressure center in the Northern Hemisphere blows
clockwise and outward from the center
In an aneroid barometer, a general rule is that the higher the reading, the more likely ____ weather
will occur, and the lower the reading, the better the chances are for ____ weather
clear; inclement
Horizontal pressure variations cause air to move from areas of _____ pressure to areas of ____
pressure.
high; low
