Condensed water vapor that forms on surfaces such as twigs, leaves, and blades of grass as the temperature drops.
Averaged for an entire year in middle latitudes, dew yields a blanket of water between ____ thick.
On clear, calm nights, objects near the earth's surface cool rapidly by emitting _____ _____
Dew is more likely to form on nights that are ____ and _____ than on nights that are _____ and _____.
clear and calm, cloudy and windy
Cloudy, windy weather that inhibits rapid cooling near the ground and the forming of _____ often signifies the approach of a _____ storm system.
When air cools to the dew point, the relative humidity becomes _____% and the air is saturated. Continued cooling condenses some of the vapor into tiny ____ _____
100, cloud droplets
A volume of air about the size of an index finger contains between _____ and ____ particles.
1000 and 150,000
Condensation nuclei most favorable for producing clouds have a radii of ____um
0.1 and are called cloud condensation nuclei
Haze, fog, and clouds will form at relative humidity near or below ____% due to the mixture of particles in the air.
As humidity increases from about 60% to 80%, the scattering effect of wet haze increases a factor of nearly ____.
When the visibility lowers to less than 1km, and the air is wet with countless millions of tiny floating water droplets, the wet haze becomes a cloud resting near the ground, which we call _____
Fog that forms over cities is _____ than fog that forms over the oceans with eh same water content due to the greater number of nuclei.
Fog that forms in polluted air can turn acidic as the tiny liquid droplets combine with gaseous impurities, such as oxides of sulfur and nitrogen to form _____
Two ways in which fog forms:
1. by cooling- air is cooled below its saturation point (dew point)
2. by evaporation and mixing- water vapor is added to the air by evaporation, and the moist air mixes with relatively dry air
_____ and _____ are the primary means for cooling the nighttime air near the ground.
radiation and conduction
Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point
Fog that forms as relatively wars moist air moves over a colder surface that cooled mainly by radiational cooling.
Fog produced when sufficient water vapor is added to the air by evaporation, and the moist air mixes with relatively drier air.
The two common types are _____ fog, which forms when cold air moves over warm water, and ______ fog, which forms as warm raindrops evaporate in a cool air mass.
Evaporation (mixing fog)
A cloud resting on the ground composed of water droplets, ice crystals, or a combination of both.
Latin to English:
layer - sheet like
heap - puffy
curl of hair - wispy
violent rain - rain cloud
Most common high clouds which are thin, wispy clouds blown by high winds into long streamers called mares' tails.
Thin, sheetlike, high clouds that often cover the entire sky. So thin that the sun and moon can be clearly seen through them. The ice crystals in these clouds end the light passing through them and will often produce a halo.
Clouds seen less frequently than cirrus, appear as small, rounded, white puffs that may occur individually or in long rows
Usually cover small portion of the sky, small ripples resemble fish scales, mackeral sky
Gray or blue-gray cloud composed of ice crystals and water droplets. Often cover the entire sky across an area that extends over many hundreds of square kilometers.
Middle clouds composed mostly of water droplets and are rarely more than 1km thick. They appear as gray, puffy masses, sometimes rolled out in parallel waves or bands. Usually one part is darker than another.
A dark gray, "wet"-looking cloudy layer associated with more or less continuously falling rain or snow.
Low lumpy clouds that appear in rows, in patches, or as rounded masses with blue sky visible between the individual cloud elements.
Puffy cloud that takes on a variety of shapes, but most often it looks like a piece of floating cotton with sharp outlines and a flat base.
If a cumulus congestus continues to grow vertically, it develops into a giant _____
A uniform grayish cloud that often covers the entire sky. Resembles a fog that does not reach the ground.
Moist air crossing a mountain barrier often forms into waves. The clouds that form in the wave rest usually have a lends shape and are therefore, called ____ _____
Form in sinking air. Appear as baglike sacs that hang beneath the clouds and resemble a cow's udder.
Jet aircraft flying at high altitudes often produce a cirrus-like trail of condensed water vapor called a condensation trail or a ____
Wavy bluish-white clouds, so thin that stars shine brightly through them, may sometimes been seen in the upper mesosphere, at altitudes above _____km
The amount of time the air temperature during the winter must remain below a certain value so that fruit and nut trees will grow properly during the spring and summer.
Also called could condensation nuclei. Tiny particles upon whose surfaces condensation of water vapor begins in the atmosphere. Small nuclei less than 0.2um in radius are called Atiken nuclei; those with a radii between 0.2 and 1 um are large nuclei, while giant nuclei have a nuclei larger than 1um.
Evaporation (mixing) fog- fog produced when sufficient water vapor is added to the air by evaporation, and the moist air mixes with relatively drier air. The two common types are steam fog, which forms when cold air moves over warm water, and frontal fog, which forms as warm raindrops evaporate in a cool air mass.
Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point
(also called radiation frost) refers to the white ice crystals, loosely deposited on the ground or exposed objects, that form on cold clear nights when heat losses into the open skies cause objects to become colder than the surrounding air.
In the atmosphere, tiny solid or liquid suspended particles of various composition are called:
The temperature of the tropopause is much (colder/hotter) than the temperature at the earth's surface.
The instrument that measures temperature, pressure, and humidity at various altitudes int he atmpsphere:
The heat energy released when water vapor changes to a liquid is called:
latent heat of condensation
If the average temperature of the sun increase, the wavelength of peak solar emission would:
shift to a shorter wavelength
An important reason for the large daily temperature range over deserts is:
there is little water vapor in the air to absorb and re-radiate infrared radiation
During an equinox:
days and nights are of equal length, sun is overhead the equator, earth is not tilted toward nor away from the sun
The maximum in daytime surface temperature typically occurs ____ the earth receives its most intense solar radiation.
Seasons are caused by:
the angle at which sunlight reaches the earth, the length of the daylight hours
ususally cover small portion of the sky, small ripples resemble fish scales, mackeral sky,
composed of water droplets; only one km thick; gray puffy masses; often in parallel bands;
dark gray wet looking and continuously falling rain or snow, light or moderately steady precip
cap cloud, form above a cumulonimbus cloud or cumulus congestus cloud b/c most winds are defected to top of cloud
formed when warm air rides up and over cold surface this is why we get foggy days after a big snow followed by warm temps
warm moist air moves inland from gulf air passes over cooler areas and air cools below dew point and spreads over a large region and common in central US
The lowest temperature that can be attained by evaporating water into the air is the ____ ____
The temperature at which the air must be cooled for saturation to occur is called the ____ ____
On most days the relative humidity reaches its highest value when the air temperatures reaches its ____ value.
If the air temperature remain constant, evaporating water into the air will ____ the dew-point temperature and ____ the relative humidity.
Why in NA the Gulf Coast states are more humid in summer than the coastal areas of southern California?
the surface water temperature of the Gulf of Mexico is very warm
What two factors cause the relative humidity of air to change.
Change air's water vapor content. Change air temperature.
Dew, frost, and frozen dew form when objects on the surface cool below the air's ____ ____ temperature
____ ____ are important int he atmosphere because they serve as surfaces on which water vapor condenses.
____ not only photograph clouds, they provide scientists with a great deal of physical information about the earth and its atmosphere.
Light or moderate but steady precipitation that covers a broad area is most often associated with this cloud
This cloud's elements (puffs) should be about the size of your thumbnail when your hand is extended to arm's length
This clouds elements (puffs) should be about the size of your fist when your hand is extended to arm's length
Fog that forms as relatively warm air moves over a colder surface is called _____ ____
A cloud that sometimes resembles a silken scarf capping the top of a developing cumulus cloud is the ____
The fog most likely to form on a clear, calm autumn morning above a cold lake is:
evaporation (mixing) fog
If you are standing outside and notice that the sky is covered with a high, white layered cloud, and you look at the ground and observe your shadow, you may conclude that the cloud overhead is:
cirrostratus - sometimes makes a halo because it is so thin to sunlight
The highest clouds in our atmosphere are called:
upper mesosphere at 246,000 ft
The highest cirrus clouds form in the tropics at 60,000 ft
If a cloud appear s white in a visible satellite picture and gray in an infrared picture, then the cloud would most likely be a:
low = gray
high = white
The satellites that are positioned at the highest level above the earth's surface are"
geostationary satellites (38,500km)
The process by which a parcel expands and cools or compresses and warms with no interchange of heat with its surroundings.
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 ____
The rate at which the air temperature changes inside a rising or descending parcel of unsaturated air is called the ____ ____ ____
dry adiabatic 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 ____
The rate at which the temperature changes inside a rising or descending parcel of saturated air is called the ____ ____ ____
moist adiabatic rate
If unsaturated stable air is lifted to a level where it becomes saturates and unstable, this type of instability is called ____ _____
Rising saturated air cools at a lesser rate than rising unsaturated air primarily because
latent heat of condensation is released in a rising parcel of saturated air
When air temperature decreases very slowly with height, and the environmental lapse rate is less than the moist adiabatic rate, the atmosphere is:
When the atmosphere is absolutely unstable, the environmental lapse rate is ____ the dry adiabatic rate.
A moist layer of stable surface air can change into a deck of low stratocumulus clouds by the process of:
For least polluted surface air, the best time of the day for a farmer to burn agricultural debris would be:
around the time of maximum surface air temperature
These two conditions, working together, will make the atmosphere the most unstable.
warm the surface and cool the air aloft
These two condition, working together, will make the atmosphere the most stable:
cool the surface and warm the air aloft
An inversion represents an extremely stable atmosphere because a parcel of air that rises into an inversion will eventually become ____and ____ dense than the air surrounding it.
Subsidence inversion are best developed with ____ pressure areas because of the ____ air associated with them.
The moist adiabatic rate is different from the dry adiabatic rate because:
latent heat is released inside a parcel of rising saturated air
Most thunderstorms do not penetrate very far into the stratosphere because the stratosphere is a layer of unstable air. T/F
the stratosphere is a layer of stable air
A conditionally unstable atmosphere is stable with respect to unsaturated air and unstable with respect to saturated air. T/F
Radiational cooling of the surface at night tends to make the lower atmosphere unstable. T/F
In a conditionally unstable atmosphere, the environmental lapse rate will be greater than the moist adiabatic rate and less than the dry adiabatic rate. T/F
If you were to take a trip this summer from Ohio to Nevada, you would probably observe the bases of afternoon cumulus clouds increasing in height above the ground as you travel westward. T/F