clouds

formation

Clouds form when air reaches its dew point. This can happen in two ways: (1) Air temperature stays the same but humidity increases. This is common in locations that are warm and humid. (2) Humidity remains the same, but temperature decreases. When the air cools enough to reach 100% humidity, water droplets form. Air cools when it comes into contact with a cold surface or when it rises. Rising air creates clouds when it has been warmed at or near the ground level and then is pushed up over a mountain or mountain range or is thrust over a mass of cold, dense air. Click image to the left or use the URL below. URL:

effects on weather

Clouds have a big influence on weather: by preventing solar radiation from reaching the ground. by absorbing warmth that is re-emitted from the ground. as the source of precipitation. When there are no clouds, there is less insulation. As a result, cloudless days can be extremely hot, and cloudless nights can be very cold. For this reason, cloudy days tend to have a lower range of temperatures than clear days.

humidity

Humidity is the amount of water vapor in the air in a particular spot. We usually use the term to mean relative humidity, the percentage of water vapor a certain volume of air is holding relative to the maximum amount it can contain. If the humidity today is 80%, it means that the air contains 80% of the total amount of water it can hold at that temperature. What will happen if the humidity increases to more than 100%? The excess water condenses and forms precipitation. Since warm air can hold more water vapor than cool air, raising or lowering temperature can change airs relative humidity (Figure 1.1). The temperature at which air becomes saturated with water is called the airs dew point. This term makes sense, because water condenses from the air as dew if the air cools down overnight and reaches 100% humidity. This diagram shows the amount of water air can hold at different temperatures. The temperatures are given in degrees Cel- sius.

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clouds

Water vapor is not visible unless it condenses to become a cloud. Water vapor condenses around a nucleus, such as dust, smoke, or a salt crystal. This forms a tiny liquid droplet. Billions of these water droplets together make a cloud.

fog

Fog (Figure 1.3) is a cloud located at or near the ground . When humid air near the ground cools below its dew point, fog is formed. Each type of fog forms in a different way. Radiation fog forms at night when skies are clear and the relative humidity is high. As the ground cools, the bottom layer of air cools below its dew point. Tule fog is an extreme form of radiation fog found in some regions. San Francisco, California, is famous for its summertime advection fog. Warm, moist Pacific Ocean air blows over the cold California current and cools below its dew point. Sea breezes bring the fog onshore. Steam fog appears in autumn when cool air moves over a warm lake. Water evaporates from the lake surface and condenses as it cools, appearing like steam. Warm humid air travels up a hillside and cools below its dew point to create upslope fog. (a) Tule fog in the Central Valley of California. (b) Advection fog in San Francisco. (c) Steam fog over a lake. (d) Upslope fog in Terespolis city, Rio de Janeiro State, Brazil. Fog levels are declining along the California coast as climate warms. The change in fog may have big ecological changes for the state. Click image to the left or use the URL below. URL:

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types of clouds

Clouds are classified in several ways. The most common classification used today divides clouds into four separate cloud groups, which are determined by their altitude (Figure 1.2). The four cloud types and where they are found in the atmosphere. High clouds form from ice crystals where the air is extremely cold and can hold little water vapor. Cirrus, cirrostratus, and cirrocumulus are all names of high clouds. Middle clouds, including altocumulus and altostratus clouds, may be made of water droplets, ice crystals or both, depending on the air temperatures. Thick and broad altostratus clouds are gray or blue-gray. They often cover the entire sky and usually mean a large storm, bearing a lot of precipitation, is coming. Low clouds are nearly all water droplets. Stratus, stratocumulus, and nimbostratus clouds are common low clouds. Nimbostratus clouds are thick and dark. They bring steady rain or snow. Vertical clouds, clouds with the prefix "cumulo-," grow vertically instead of horizontally and have their bases at low altitude and their tops at high or middle altitude. Clouds grow vertically when strong air currents are rising upward. Precipitating clouds are nimbus clouds.

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instructional diagrams

description_image

This diagram shows the common types of clouds in the troposphere. The three main types of clouds are cirrus, stratus and cumulus. The types of clouds varies according to how high it is above the ground from 5,000 feet up to 20,000 feet. Because of the cold temperature at high altitudes, clouds are made up of ice crystals. Cloud types can be easily identified by their appearance. Stratus and Cumulus clouds usually form at lower altitudes, clumpy and usually causes rain and precipitation. While Cirrus clouds form at higher altitudes where the temperature is fairly constant and is usually evenly scattered. Clouds play a big role in maintaining the balance of the earth's temperature and has a big impact on the weather. Shown also are Aerosols that stay in the lower atmosphere. Aerosols are produced naturally but recent concerns have been raised since these are largely man-made and Aerosols have significant impacts on cloud and weather system.

description_image

Below the stratus, there is steady precipitation whereas below the cumulus, there is showery precipitation. Right below 6,500 ft, there are low clouds and between 6,500 ft and 23,000 ft, there are the middle clouds. It is higher than 23,000 ft where there is the cirrus, cirrostratus, and cirrocumulus. There is also a halo around the sun.

questions

how do clouds have an influence on weather?

a) prevents solar radiation from reaching the ground

b) absorbs warmth emitted from the ground

c) a source of precipitation

-->  d) all of the above.

clouds are classified by

-->  a) altitude

b) height

c) color

d) water content

fog forms when

a) warm air meets cold ground or water.

b) cold air meets warm ground or water.

c) warm moist air cools below its dew point.

-->  d) all of these.

what do you expect cumulonimbus clouds to be like?

a) a high cloud made of ice crystals.

b) a thick and broad cloud that is gray and precipitating.

-->  c) a cloud that is growing vertically and that is precipitating; a thundercloud.

d) a low cloud that is thick and dark and that is bringing heavy rain or snow.

when the humidity reaches 100%, water will precipitate.

-->  a) true

b) false

which of the following describes relative humidity?

a) the amount of water vapor that air can hold before it begins to precipitate.

-->  b) the amount of water vapor in air relative to the total amount it can contain.

c) the total amount of water vapor in a certain volume of air.

d) the temperature of the air relative to the temperature when the air is saturated with water.

clouds form when air reaches its dew point. this happens when

a) air temperature stays the same but humidity increases.

b) humidity stays the same but temperature decreases.

c) air temperature increases but humidity decreases.

-->  d) a & b

some early mornings, dew drops can be found on grass (or on a car parked outside), but not on other materials like sidewalks. what has happened?

-->  a) the nighttime temperature on grass and the car went below the dew point, but the

b) the region went below the dew point but the sun in the morning caused some of the dew to evaporate.

c) the relative humidity of the air above the grass and car was higher than it was over the concrete.

d) none of these.

diagram questions

question_image

In the diagram which label refers to a cumulonimbus cloud?

-->  a. D

b. K

c. W

d. J

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Which label corresponds to a cirrus cloud?

a. Y

-->  b. K

c. T

d. W

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Which represents fog?

-->  a. J

b. Y

c. C

d. D

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Identify the cirrocumulus in this picture

a. E

b. F

c. N

-->  d. Y

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Identify the cirrocumulus clouds on the diagram

a. F

-->  b. Y

c. C

d. E

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The sky is represented as what letter?

a. S

b. N

-->  c. T

d. C

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What letter represents altocumulus Clouds?

-->  a. Y

b. M

c. C

d. J

question_image

Which letter indicates stratocumulus clouds?

-->  a. R

b. E

c. J

d. T

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Where is the cumulus?

a. F

-->  b. N

c. J

d. T

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Which cloud depicts a cirrus cloud?

a. M

b. V

c. J

-->  d. C

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Identify the cirrus in this picture

a. K

b. X

c. R

-->  d. F

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Which type of cloud forms high in the troposphere?

a. F

b. N

-->  c. E

d. A

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Which label refers to the cirrus?

a. L

b. H

c. J

-->  d. Y

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Which label represents the cirrus?

a. L

b. H

c. W

-->  d. Y

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Which label refers to the cirrus?

a. Y

b. L

c. K

-->  d. U

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Which label shows the cirrocumulus?

a. U

b. Y

c. K

-->  d. L

question_image

Identify the cumulonimbus clouds.

a. Y

b. K

c. U

-->  d. F

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Identify which clouds produce precipitation.

a. F

-->  b. P

c. Y

d. C

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Which letter represents the cumulus cloud?

a. U

b. L

-->  c. A

d. K

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Identify L

a. STRATUS

b. ALTOSTRATUS

c. CIRRUS

-->  d. CUMULONIMBUS

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Which letter identifies the cumulonimbus?

a. R

-->  b. L

c. K

d. N

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Identify the clouds that are so high in the troposphere that they are made of ice crystals.

a. K

b. N

-->  c. H

d. D

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Which cloud type occurs in both high and low altitudes?

-->  a. L

b. Y

c. K

d. S

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Which cloud produces rain?

-->  a. L

b. K

c. S

d. D

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Which of the following is known as a high level cloud type?

a. Altocumulus

b. Stratus

c. Stratocumulus

-->  d. Cirrus

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What is the highest cloud type shown?

a. Cirros

-->  b. Cirrus

c. Cirrostratus

d. Cirrocumulus

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How many low level cloud types are there?

a. 6

b. 4

c. 3

-->  d. 5

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How many mid-level clouds are shown in the diagram?

a. 3

b. 1

c. 4

-->  d. 2

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Which type of cloud sits closest to the ground?

a. cumulus

b. cirrus

-->  c. fog

d. stratus

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According to the diagram, which type of cloud can produce rain?

a. Contrails

-->  b. Nimbostratus

c. Cumulus

d. Cirrostratus

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Which type of cloud is formed higher than Nimbostratus but lower than Cirrostratus?

-->  a. Altostratus

b. Fog

c. Cirrus

d. Stratocumulus

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How many types of clouds are shown in the picture?

a. 14

b. 12

-->  c. 11

d. 13

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How many types of condensation can occur?

a. 11

b. 9

c. 10

-->  d. 12

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What is the cloud that flies closest to the ground?

a. Stratus

b. Nimbostratus

-->  c. Fog

d. Cumulus

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Which of these clouds is highest in the atmosphere?

a. fog

-->  b. cirrus

c. stratocumulus

d. stratus

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Which type of cloud is most likely to be made up of ice crystals?

a. Nimbostratus

-->  b. Cirrus

c. Stratus

d. Altostratus

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In terms of altitude, what are clouds that is in between Stratus and Cirrostratus

a. Stratus

b. Cirrus

c. Nimbostratus

-->  d. Altostratus

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Which type of cloud formed on the highest elevation?

a. Altostratus

b. Stratus

c. Nimbostratus

-->  d. Cirrus

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Above what height from the ground is the altostratus present?

-->  a. 7 kilometer

b. 5 kilometer

c. 2 kilometer

d. 3 kilometer

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How many types of clouds are shown in the diagram?

a. 4

-->  b. 5

c. 6

d. 3

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Which of these clouds is highest in the atmosphere?

-->  a. cirrus

b. stratus

c. nimbostratus

d. cirrostratus

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Which of these clouds is highest in the atmosphere?

a. cumulus

-->  b. cirrus

c. stratus

d. stratocumulus

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What causes weather?

a. Altostratus

-->  b. Unequal heating of the atmosphere

c. Movement of the earth

d. Cirrus

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Which are the small clouds that are white and puffy?

a. Fog

b. Stratus

c. Cirrus

-->  d. Cumulus

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Which clouds appear as straight lines in the sky?

a. cirrus

b. stratus

c. cumulus

-->  d. contrails

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From the diagram, how many kind of clouds are there?

a. 11

b. 14

c. 13

-->  d. 12

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How many kinds of clouds shown?

-->  a. 1

b. 12

c. 2

d. 5

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Which of these cloud types is closest to the ground?

a. cirrocumulus

b. cirrus

-->  c. stratus

d. cirrostratus

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What type of clouds do not usually produce precipitation?

-->  a. cirrus

b. stratus

c. cumulus

d. altocumulus

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Which of these cloud types is the lowest in the troposphere?

a. Cirrocumulus

b. Altostratus

c. Cirrostratus

-->  d. Nimbostratus

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Which of these clouds bring rain?

-->  a. nimbostratus

b. altocumulus

c. cirrostratus

d. cirrus

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Why is the water cycle important?

a. it provides energy to plants

b. it maintains gravity

c. it helps in the photosynthesis

-->  d. The water cycle plays an important role in weather. changes in the water cycle changes the weather

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What types of clouds do you find below 2km?

a. Cirrus and cumulonimbus

b. Altostratus and cirrocumlus

c. Cumulus and stratus

-->  d. Stratus and nimbostratus

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Which clouds are found at 2 km high?

a. cirrocumulus

b. cirrus

c. altostratus

-->  d. Nimbostatus, Stratus, and cumulonimbus

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Which type of cloud usually occurs in the low troposphere?

-->  a. Stratus

b. Cirrocumulus

c. Cumulonimbus

d. Cirrus

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How many cloud types are formed two kilometers or fewer above the ground?

a. 4

-->  b. 3

c. 5

d. 1

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How many types of clouds are between the altitude of 4 and 8 km?

a. 2

b. 3

-->  c. 5

d. 4

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Which among the types of clouds is the highest?

a. Cumulonimbus

-->  b. Cirrus

c. Cumulus

d. Cirrocumulus

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Which clouds are thin and wispy in appearance?

a. Cumulonimbus

b. Cumulus

-->  c. Cirrus

d. Nimbostratus

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Which of the following cloud types does not create precipitation?

a. Cumulonimbus

-->  b. Cirrocumulus

c. Stratocumulus

d. Nimbostratus

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Where are cirrus clouds formed?

a. In space

-->  b. High in the troposphere

c. In mid-troposphere

d. Low in the troposphere

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Which of the following types of clouds exist at mid elevation (6500 feet-23000 feet)?

-->  a. Altostratus

b. Cirrus

c. Cirrocumulus

d. Stratus

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How many kinds of clouds are there?

-->  a. 10

b. 11

c. 9

d. 8

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How many types of clouds are being represented in the image below?

a. 4

-->  b. 10

c. 9

d. 8

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What is a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category characterized by globular masses?

a. Cirrus

-->  b. Altocumulus

c. Cirrostratus

d. Cirrocumulus

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What is the top item depicted in the diagram?

a. Cirrostratus

-->  b. Clouds

c. Cirrus

d. Altostratus

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Which type of cloud is nearest to us?

-->  a. Stratus

b. Altocumulus

c. Cumulonimbus

d. Cirrus

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Above which height are cirrus clouds found?

-->  a. 8 km

b. 6km

c. 2km

d. 4km

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What type of clouds is below altostratus but above stratocumulus?

-->  a. cumulus

b. cumulonimbus

c. cirrus

d. altocumulus

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How many types of clouds can be found in the atmosphere above 8 km (5mi)?

-->  a. 3

b. 1

c. 4

d. 2

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How many types of clouds appear below 6 miles in the diagram below?

a. 8

b. 6

-->  c. 10

d. 12

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Which of these clouds is highest in the atmosphere?

a. stratus

b. cumulus

c. nimbostratus

-->  d. cirrus

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Which type of cloud is made of crystals because it is so cold?

-->  a. Cirrus

b. Stratus

c. Altocumulus

d. Cirrostratus

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At how many kilometers do cirrus clouds originate?

a. 5

-->  b. 9

c. 4

d. 6

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How many types of clouds are in the image shown?

a. 9

b. 8

-->  c. 10

d. 11

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Which type of cloud is part of the middle atmosphere?

a. Stratus

b. Cirrus

-->  c. Altocumulus

d. Cumulus

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What cloud forms high in the troposphere?

a. Stratus

b. Cumulus

c. Altocumulus

-->  d. Cirrus

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What do cirrus, cirrostratus, and cirrocumulus clouds have in common?

a. They all form low in the troposphere.

b. They all form in the middle in the troposphere.

-->  c. They all form high in the troposphere

d. Nothing

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What kind of cloud covers low, medium, and high altitudes?

-->  a. cumulonimbus

b. nimbostatus

c. altostatus

d. cirrus

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Which cloud type is found across all regions of the troposphere?

a. Cirrus

b. Cumulus

-->  c. Cumulonimbus

d. Stratus

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How many kinds of clouds are there high in the atmosphere?

a. 7

-->  b. 4

c. 3

d. 5

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Which is the largest cloud?

-->  a. Cumuionimbus

b. Cirrus

c. Stratus

d. Altocumulus

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Which type of clouds are low clouds?

-->  a. cumulus

b. altocumulus

c. cirrostratus

d. cirrus

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Rain can come from this type of cloud:

a. Stratus

b. Cirrus

-->  c. Nimbostratus

d. Cumulus

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At what height is a cirrostratus cloud located?

a. 2000 m

b. Groundlevel

-->  c. 13000 m

d. 6000 m

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What type of stratus clouds produce precipitation?

-->  a. Nimbostratus

b. Altostratus

c. Cirrus

d. Cumulus

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From the diagram, how many high clouds are there?

-->  a. 3

b. 4

c. 2

d. 5

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Midlevel clouds have which prefix attached to their names?

a. Cirro-

b. Cumulo-

c. Strato-

-->  d. Alto-

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Which cloud type forms high in the troposphere, are thin and wispy, and don't usually produce precipitation?

a. Cirrocumulus

b. Cumulus

c. Altostratus

-->  d. Cirrus

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Which clouds form high in the troposphere and are made of ice crystals?

a. Cs

b. Cc

-->  c. Ci

d. Cb

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Which level of clouds causes rain?

-->  a. Low level.

b. Mid level

c. High level

d. All levels

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How many kinds of clouds appear between 2000m and 7000m?

a. 7

b. 6

-->  c. 4

d. 3

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How many types of clouds are in the diagram?

-->  a. 10

b. 9

c. 8

d. 11

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Which among the clouds extends from the lowest to the highest altitudes?

a. Altocumulus

b. Nimbostratus

-->  c. Cumulonimbus

d. Stratus

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Which part of the atmosphere are Cirrus clouds formed?

a. Low

b. The ground

-->  c. High

d. Mid

question_image

Identify the cirrus clouds

a. T

-->  b. E

c. K

d. R