Quiz 2 ATMO pt 1

A _ usually indicates clearing weather or fair weather.

A gradient wind blowing around the low-pressure center is constantly accelerating because it is constantly changing directions. This acceleration is called _.

A ridge on an upper-air isobaric chart indicates _.

A Surface low pressure center is generally associated with _ on an upper-air isobaric chart.

A wind blowing at a constant speed parallel to straight line isobars with the pressure gradient force PGF and the Coriolis force in a balance is called _.

A Wind that blows at a constant speed parallel to curved isobars or contour lines is called a _.

An object is falling at constant speed. The net force is _.

Atmospheric pressure changes _.

Cyclonic flow means _ in either the Northern or Southern Hemisphere

If the earth's gravitational force were to increase, atmospheric pressure at the ground would _.

In the vertical, the pressure gradient force points _ and gravity points _.

A station at an altitude of 900m (about 3000 ft) above sea level measures an air pressure of 930 mb. Under normal conditions, which of the values below would be the most realistic sea level pressure for this station?

Low _ on a constant height chart corresponds to low _ on a constant pressure chart.

Net convergence of air would cause surface pressure to _ and net divergence would cause surface pressure to _.

On an isobaric surface:

On an isobaric weather chart, the spacing of the height contours indicates the magnitude of the _ force.

On an upper-level chart the wind tends to blow:

On an upper-level isobaric chart, normally we find warm air associated with _ heaights, and cold air associated with _ heights.

Pressure changes:

The _ force is the force that causes the wind to blow.

The atmosphere around the earth would rush off into space if the vertical pressure gradient force were not balanced by:

The contour lines drawn on a 500mb chart are lines constant:

The force that would cause a stationary parcel of air to begin to move horizontally is called the:

The PGF is directed from higher pressure toward lower pressure:

The surface air around a strengthening low pressure area normally _, while air aloft, directly above the surface low, normally _.

The suface 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 _ than in the cold column.

The wind around a surface high pressure center in the Northern Hemisphere blows:

Warm air aloft is associated with constant pressure surfaces that are found at _ altitude than normal and _ than normal atmospheric pressure aloft.

We can generally expect the air to be _ above areas of surface low pressure and _ above areas of surface high pressure.

Which of the following can influence wind direction?

Which of the following forces can NOT act to change the speed of wind?

An altimeter is often just an aneroid barometer that has been calibrated to indicate altitude.

Fast winds at high latitudes produce the strongest Coriolis force.

If the earth stopped rotating there would ne longer be a Coriolis force.

If, at your home in the Northern Hemisphere, the surface wind is blowing from the northwest, then the region of lowest pressure will be to the east of your home.

Suppose that the winds aloft are geostrophic and blowing from the north. Low pressure is located to the east.

Surface winds blow across the isobars at an angle due to the frictional force.

The rate of the earth's rotation determines the strength of the pressure gradeint force.

The vertical pressure gradient force is directed downward.

Winds blow slightly inward around surface low pressure centers in the Southern Hemisphere.

The pressure change that occurs over a horizontal distance

An apparent force created by the rotation of the Earth

Surface wind that blows from land to water

Wind aloft that blows in a straight line at constant speed parallel to the isobars or contours

Instrument that employs Doppler radar to obtain a vertical profil of wind speed and wind direction

To correctly monitor horizontal changes in air pressure, this is the most important correction added to the station pressure

Instrument that usually consists of three or more cups

Indicates the percent of time the wind blows from different directions

The force exerted by air molecules over a given area

Lines of equal pressure