Meteorology Test 2

Pure water suspended in the atmosphere will freeze at a temperature of

-40°C

It takes the water content of about ______ cloud droplets to form a single raindrop.

1,000,000

A lapse rate of ______ Celsius degrees per 1000 meters is conditionally stable.

8

Lows and Highs are identified on surface weather maps by areas enclosed within isobars. Which one of the following statements about Lows is true?

Air pressure increases outward from the center of a Low.

The Coriolis Effect arises from the fact that

Earth rotates

______ is numerically equivalent to a force per unit mass.

Pressure

Usually, the air pressure inside a building is _____ the air pressure outside the building.

about the same as

Relative humidity depends on the water vapor present in the air and the:

air temperature

Friction affects horizontal winds

by slowing the winds and shifting them across isobars toward low pressure.

All of the following clouds typically have relatively low bases with the exception of

cirrostratus

Which of these clouds is least likely to produce precipitation that reaches the ground?

cirrostratus

Air pressure decreases more rapidly with altitude within a column of ________ air than in a column of __________ air.

cold..........warm

As the temperature of air is reduced to its dew point, which of these is most likely to occur?

condensation

A cloud that may be cold at the top and warm at low levels:

cumulonimbus

Thunder and lightning are associated with the ________ cloud.

cumulonimbus

Between the tropopause and stratopause, the air pressure ______ with increasing altitude.

decreases

The temperature of ascending parcels of unsaturated (clear) air __________ because of __________.

drops. . . . . .expansional cooling

The _________ adiabatic lapse rate is 9.8 Celsius degrees per 1000 m.

dry

The Coriolis Effect is zero and produces no deflection of the wind at the:

equator

During the process of adiabatic cooling, the temperature decreases because the air has:

expanded to a larger volume

Relatively high surface air pressure is usually accompanied by _________ weather whereas relatively low surface air pressure is usually accompanied by __________weather.

fair..............stormy

On a clear and calm day, the relative humidity usually ______ between sunrise and early afternoon.

falls

Rising parcels of unsaturated (clear) air cool at a _________ rate than rising parcels of saturated (cloudy) air.

faster

Clouds are classified and named according to their altitude and:

form or appearance.

Which association is NOT correct?

high cloud...nimbostratus

Suppose that the vapor pressure of the cold outside air is the same as the vapor pressure of the warm air indoors. If the door is opened and the cold air replaces some of the warm air, then the new relative humidity indoors would be

higher than before

Rising air temperature causes the saturation mixing ratio to ______

increase

As the difference between the dewpoint and the ambient air temperature decreases, the relative humidity __________.

increases

The capacity of the air to hold water vapor:

increases with an increase in temperature.

Which one of the following has the greatest terminal velocity?

large hailstone

The moist adiabatic rate is different from the dry adiabatic rate because:

latent heat is released inside a parcel of rising saturated air.

At the same temperature and pressure, humid air is ______ dry air.

less dense than

At the same pressure, cold air is ______ warm air.

more dense than

Relative humidity indicates the:

nearness to saturation for the air.

If the mixing ratio of a parcel of air is 6 grams per kilogram and the relative humidity is 25 percent, the saturation mixing ratio is ______ grams per kilogram.

none of these are correct

The top of the atmosphere is at an average altitude of __________ km.

none of these are correct

The ______ causes air to flow from areas of relatively high air pressure to areas of relatively low air pressure.

pressure gradient force

Which type of fog occurs during nights when skies are clear and relative humidity is high?

radiation fog

As a mass of warmer and more humid air invades our locality, air temperature _____ and air density _____.

rises...............decreases

In cold clouds, a vapor pressure that is ______ for water droplets is ______ for ice crystals.

saturated...............supersaturated

Normally, the stratosphere is ______.

stable

Supercooled water is water which is:

still liquid at temperatures below 0°C.

The cloud form that is best described as sheets or layers that cover much or all of the sky is termed:

stratus

Clouds, dew and frost all form because air has become saturated. This condition of saturation is USUALLY caused by:

the air being cooled.

As unsaturated (clear) air flows down the leeward slopes of a mountain range,

the air temperature rises, the relative humidity decreases, and the saturation vapor pressure increases.

The Bergeron process causes cloud droplets to grow because:

the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.

Conditional stability indicates that an air layer is

unstable for saturated and stable for unsaturated air parcels

When humid air moves up a slope or mountain side, a(n) ________ fog may form.

upslope

Water or ice particles that vaporize before reaching the ground may appear as dark curtains or streaks. This is known as ______.

virga

Advection fog forms when

warm humid air streams over the cold surface of a lake