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    Thunderstorm and Floods

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    Jairah Angue
    The document discusses thunderstorms and floods. It describes how thunderstorms form due to rising warm moist air and how they can produce heavy rain, hail, tornadoes and lightning. It explains that hail forms from layers of frozen water droplets and how lightning occurs between the cloud and ground. Signs of impending thunderstorms are listed. Flooding is described as land becoming submerged by water, with natural causes like heavy rain and river overflow, as well as man-made causes such as deforestation. Types of floods and warning signals are identified.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Thunderstorm and Floods

    Uploaded by

    Jairah Angue
    34 views25 pages
    The document discusses thunderstorms and floods. It describes how thunderstorms form due to rising warm moist air and how they can produce heavy rain, hail, tornadoes and lightning. It explains that hail forms from layers of frozen water droplets and how lightning occurs between the cloud and ground. Signs of impending thunderstorms are listed. Flooding is described as land becoming submerged by water, with natural causes like heavy rain and river overflow, as well as man-made causes such as deforestation. Types of floods and warning signals are identified.

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    Original Title

    THUNDERSTORM AND FLOODS

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    © © All Rights Reserved

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    The document discusses thunderstorms and floods. It describes how thunderstorms form due to rising warm moist air and how they can produce heavy rain, hail, tornadoes and lightning. It explains that hail forms from layers of frozen water droplets and how lightning occurs between the cloud and ground. Signs of impending thunderstorms are listed. Flooding is described as land becoming submerged by water, with natural causes like heavy rain and river overflow, as well as man-made causes such as deforestation. Types of floods and warning signals are identified.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    34 views25 pages

    Thunderstorm and Floods

    Uploaded by

    Jairah Angue
    The document discusses thunderstorms and floods. It describes how thunderstorms form due to rising warm moist air and how they can produce heavy rain, hail, tornadoes and lightning. It explains that hail forms from layers of frozen water droplets and how lightning occurs between the cloud and ground. Signs of impending thunderstorms are listed. Flooding is described as land becoming submerged by water, with natural causes like heavy rain and river overflow, as well as man-made causes such as deforestation. Types of floods and warning signals are identified.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 25

    OBJECTIVES:

    •DESCRIBE THE CONCEPT OF THUNDERSTORMS AND


    FLOODS
    •EXPLAIN THE WARNING SIGNALS FOR HAZARDS
    SUCH AS FLOODS
    •DISCUSS HOW TO REDUCE RISKS AND PREPARE FOR
    THUNDERSTORMS AND FLOODS
    THUNDERSTORM
    • THUNDERSTORM, A VIOLENT, SHORT-LIVED WEATHER DISTURBANCE THAT IS
    ALMOST ALWAYS ASSOCIATED WITH LIGHTNING, THUNDER, DENSE CLOUDS,
    HEAVY RAIN OR HAIL, AND STRONG, GUSTY WINDS.
    • THUNDERSTORM CAN PRODUCE HEAVY RAINS, FLOODS, TORNADOES,
    HAILSTONES, AND LIGHTNING.
    • THUNDERSTORMS ARISE WHEN LAYERS OF WARM, MOIST AIR RISE IN A
    LARGE, SWIFT UPDRAFT TO COOLER REGIONS OF THE ATMOSPHERE.
    • THE MOISTURE CONTAINED IN THE UPDRAFT CONDENSES TO FORM
    TOWERING CUMULONIMBUS CLOUDS AND, EVENTUALLY, PRECIPITATE.
    THUNDERSTORM
    HAILSTONES
    • HAIL IS FORMED WHEN DROPS OF WATER FREEZE TOGETHER IN THE COLD UPPER
    REGIONS OF THUNDERSTORM CLOUDS.
    • HAILSTONES ARE NOT FROZEN RAINDROPS.
    • HAILSTONES ARE FORMED BY LAYERS OF WATER ATTACHING AND FREEZING IN A
    LARGE CLOUD.
    • A FROZEN DROPLET BEGINS TO FALL FROM A CLOUD DURING A STORM, BUT IS PUSHED
    BACK UP INTO THE CLOUD BY A STRONG UPDRAFT OF WIND.
    • WHEN THE HAILSTONE IS LIFTED, IT HITS LIQUID WATER DROPLETS. THOSE DROPLETS
    THEN FREEZE TO THE HAILSTONE, ADDING ANOTHER LAYER TO IT.
    • THE HAILSTONE EVENTUALLY FALLS TO EARTH WHEN IT BECOMES TOO HEAVY TO
    REMAIN IN THE CLOUD, OR WHEN THE UPDRAFT STOPS OR SLOWS DOWN.
    LIGHTNING
    • LIGHTNING IS A VERY QUICK ELECTRICAL DISCHARGE THAT
    OCCURS BETWEEN A CLOUD AND THE GROUND, BETWEEN TWO
    CLOUDS, OR WITHIN A CLOUD. IT CAN BE SEEN AS A BRIGHT
    FLASH AND IS FOLLOWED BY THE SOUND OF THUNDER.
    • THE UPDRAFT OF AIR CARRIES POSITIVELY CHARGED WATER
    DROPLETS WITH IT. THE DOWNDRAFT OF PRECIPITATION
    TRANSPORTS NEGATIVELY CHARGED WATER DROPS
    DOWNWARD TO THE BOTTOM OF THE CLOUD.
    SIGNS OF IMPENDING THUNDERSTORM
    •CUMULONIMBUS CLOUDS
    •DARK SKIES
    •FLASHES OF LIGHTNING AND GUSTY WIND
    •SOUND OF THUNDER
    •STATIC ON YOUR COMMUNICATION
    EQUIPMENT
    FLOODS
    • IT IS A NATURAL EVENT OR OCCURRENCE WHERE A PIECE OF LAND
    (OR AREA) THAT IS USUALLY DRY LAND, SUDDENLY GETS
    SUBMERGED UNDER WATER.
    • FLOODS OCCUR AT IRREGULAR INTERVALS AND VARY IN SIZE,
    DURATION AND THE AFFECTED AREA.
    • IT IS IMPORTANT TO NOTE THAT WATER NATURALLY FLOWS FROM
    HIGH AREAS TO LOW LYING AREAS. THIS MEANS LOW-LYING
    AREAS MAY FLOOD QUICKLY BEFORE IT BEGINS TO GET TO HIGHER
    GROUND.
    NATURAL CAUSES OF FLOODS
    •RAINS
    NATURAL CAUSES OF FLOODS
    •RIVER OVERFLOW
    NATURAL CAUSES OF FLOODS
    •HURRICANES, STRONG WINDS IN COASTAL
    AREAS
    NATURAL CAUSES OF FLOODS
    •DAM BREAKING
    NATURAL CAUSES OF FLOODS
    •ICE AND SNOW-MELTS
    NATURAL CAUSES OF FLOODS
    •STORM SURGE
    MAN MADE CAUSES OF FLOODS
    •INCREASED URBANIZATION AND COASTAL
    DEVELOPMENT
    MAN MADE CAUSES OF FLOODS
    •INFORMAL SETTLERS
    MAN MADE CAUSES OF FLOODS
    •INDISCRIMINATE DUMPING OF GARBAGE
    MAN MADE CAUSES OF FLOODS
    •DEFORESTATION
    MAN MADE CAUSES OF FLOODS
    •FAILURE OF LEVEES AND DAMS
    MAN MADE CAUSES OF FLOODS
    •FAILURE OF LEVEES AND DAMS
    HTTPS://WWW.YOUTUBE.COM/WATCH
    ?V=A1IXIKLV68E
    HTTPS://WWW.YOUTUBE.COM/WATCH
    ?V=UEE0TXJAC1O
    TYPES OF FLOODS
    •RIVER FLOOD – OVER FLOWING OF RIVERS
    •FLASHFLOOD – SHORT PERIOD, HEAVY
    RAINFALL
    •COASTAL FLOOD – STRONG ONSHORE
    WINDS PUSH THE WATER; RISE IN THE SEA
    LEVEL
    FLOODS WARNING SIGNALS

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