Natural Disasters: Tornadoes

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Transcript of Natural Disasters: Tornadoes

  • What is a tornado?

    How do tornados form?

    Characteristics of a tornado

    Most common characteristics to

    identify a tornado

    Safety rules

    Page 2

    Page 3

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    Page 5

    Page 6

  • A tornado is a violently

    rotating column of air that is

    in contact with both the

    surface of the earth and

    a cumulonimbus cloud or, in

    rare cases, the base of a

    cumulus cloud.

    Various types of tornadoes

    include the land

    spout, multiple vortex tornado,

    and waterspout. Waterspouts

    are characterized by a spiraling

    funnel-shaped wind current,

    connecting to a large cumulus

    or cumulonimbus cloud.

    Texas Storm Claims

    Elie, Manitoba 2007

  • Most tornadoes form from

    thunderstorms. You need

    warm, moist air and cool,

    dry. When these two air

    masses meet, they create

    instability in the

    atmosphere.

    A change in wind

    direction and an increase

    in wind speed with

    increasing height creates

    an invisible, horizontal

    spinning effect in the

    lower atmosphere.

  • The cloud is white or

    light gray while the funnel

    remains suspended from

    the cumulonimbus cloud.

    When it makes contact

    with the ground is a dark

    gray or black color due to

    the dust and debris that

    are sucked from the

    ground by the violent

    vortex. They usually

    rotate counter clockwise

    in the northern

    hemisphere

    Tornado with a rainbow

    Tornado in Canada

  • The tornado formed in connection with a thundercloud,

    called "Cumulonimbus".

    Tornado appears at the base of the cloud "Cumulonimbus" and

    extends down to reach the soil

    funnel.

    A tornado is commonly accompanied by rain, lightning,

    hail, lightning and clouds of

    darkness.

    A common characteristic is the low atmospheric pressure

    (force per unit area exerted

    on a particular surface) in the

    center of the storm and

    enormous wind speed.

    Tornadoes move approximately 50 Km/h,

    however, some move slowly,

    while others reach speeds of

    100 Km/h or more.

    Strong tornado in USA

    Tornado in Mexico

  • You will shelter in basements or in buildings with steel or

    concrete.

    You are going to keep open some windows of the House,

    preferably on the opposite side

    from where the wind blows, but

    stay away from them.

    If you are inside a building, it is suitable you will lie on the floor

    lower.

    You are going to stay away from the windows.

    City of Richmond, Texas

    East Texas

    In the case of not having basements, you are

    going to seek protection

    under heavy and solid

    furniture in the central

    part and ground floor,

    of not having these

    media covered with a

    mattress.

    You wont remain in a car, leave it