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Ppp on clouds and their classification
 

Ppp on clouds and their classification

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    Ppp on clouds and their classification Ppp on clouds and their classification Presentation Transcript

    • PRESENTED BYM. Fasihud Din Nauman (Roll. No: 29)Environmental Science (4TH- Semester)
    • Clouds visible mass of liquid droplets orfrozen crystals made of water and/or aerosols is called cloud.
    • Cloud Location Majority of clouds form in the TROPOSPHERE Clouds can be observed in STRATOSPHERE and MESOSPHERE Three layers of atmosphere collectively called HOMOSPHERE where clouds are present Clouds are absent in the HETROSPHERE (Thermosphere and Exosphere)
    • CLOUD FORMATION Warm air is forced upward, expands then cools. As air cools the amount of water vapor needed for saturation decreases (RH then increases). RH of 100%, air is saturated Water vapor begins to condense in tiny drops around nuclei of dust, salt, and other particles. Drops of water are so small they are suspended in air. Millions of these droplets collect forming clouds.
    • CLOUDS CLASSIFICATIONThere are following components whichsummarize the classification system. ♣ Cirro : curl of hair, high ♣ Alto : mid ♣ Strato : layer ♣ Nimbo : rain, precipitation ♣ Cumulo: heap
    • CLOUD CLASSIFICATION•Clouds are classified by texture and height from the ground. SHAPE Cumulus : cotton ball shaped Stratus : forms a blanket over large areas. Cirrus : feathery or wispy
    • 4 Major families of CloudsA. High Clouds : above 5-13 km.B. Middle Clouds : 2-7 km.C. Low Clouds : 0-2 km.D. Clouds with vertical development (0-13 km)
    • Cloud Types
    • TYPES OF CLOUDS♦ High-level clouds: ♣ cirrus ♣ cirrostratus ♣ cirrocumulus♦ Mid-level clouds: ♣ altostratus ♣ altocumulus♦ Low-level clouds: ♣ stratus ♣ cumulus
    • HIGH-LEVEL CLOUDS
    • High Clouds (Family A) Composed of ice crystals (Cirrostratus) Thin and wispy (Cirrus)
    • High Clouds Cont… High-level clouds form above 6 km The temperatures are so cold at such high elevations, these clouds are primarily composed of ice crystals. High-level clouds are typically thin and white in appearance, but can appear in a magnificent array of colors when the sun is low on the horizon.
    • CIRRUS Thin, featherlike clouds that are made of icecrystals high in the atmosphere. Usually means a change in the weather is coming.
    • High Clouds Cont… Cirrus (Thin and wispy) The most common form of high-level clouds are thin and often wispy cirrus clouds. Typically found at heights greater than 20,000 feet (6,000 meters) cirrus clouds are composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus generally occur in fair weather and point in the direction of air movement at their
    • CIRROSTRATUS
    • CIRROSTRATUS Cirrostratus clouds form more of a widespread, veil-like layer. When moon orsun light passes through the ice crystals ofcirrostratus clouds, the light may dispersed.
    • High Clouds Cont… Cirrostratus (nearly transparent) Sheet-like, clouds composed of ice crystals. Though cirrostratus can cover the entire sky and be up to several thousand feet thick They are relatively transparent, as the sun or the moon can easily be seen through them. These high-level clouds typically form when a broad layer of air is lifted by large-scale Convergence Its presence indicates a large amount of moisture in the upper atmosphere These are not precipitation clouds, but signal the approach of warm front
    • CIRROCUMULUS
    • High Clouds Cont… Cirrocumulus (Cloudlets) (Cc) Typically found at heights 5 to 12 km. These clouds signify convection It includes . Cirrocumulus usually only forms in patches
    • MID-LEVEL CLOUDS
    • Mid-Level Clouds Composed of water droplets and ice crystals
    • ALTOSTRATUS
    • ALTOSTRATUS CLOUDS Altostratus clouds “strato” type clouds having flat and uniform type texture. Altostratus clouds themselves do not produce precipitation at the surface. They frequently indicate warm wave front.
    • Altocumulus Clouds
    • LOW-LEVEL CLOUDS
    • Low-Level Clouds Composed mostly of water droplets
    • STRATUSSheets of low, grey clouds that bring light snow, rain, or drizzle.
    • NIMBOSTRATUS
    • NIMBOSTRATUS Thicker layer than stratus clouds thatcompletely block out the sun. They cause steady rain or snow.
    • CUMULUSWhite and puffy clouds that usually mean good weather.
    • CUMULONIMBUS
    • CUMULONIMBUSDark, towering clouds that are also called “thunderheads”. These clouds produce heavy rain, thunderstorm, and lighting.
    • Cumulonimbus
    • PRECIPITATIONProcess by which water falls to Earthfrom clouds in the atmosphere in the form of rain, snow, sleet, or hail.
    • TYPES OFPRECIPITATION
    • As raindrops fall from theclouds they join with other droplets of water. This causes the raindrops to grow in size.