Weather Chapter 14

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Weather Chapter 14
2011-12-11 17:04:29
chapter 14

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  1. Waterspout
    • -A column of rotating wind over water that has characteristics of dust devil and tornado.
    • -or simply a tornado over water.
  2. Anvil
    Top of a thunderstorm
  3. Microburst
    a stong localized downdraft(dowburst) less than 4km wide that occurs beneath thunderstorms.
  4. Return stroke
    The luminous lightning stroke that propagates upward from the earth to the base of a cloud.
  5. Wall Cloud
    An area of rotating clouds that extends beneath a supercell thunderstorm and from which a funnel cloud may apppear.
  6. Where do the most thuderstorms occur?
  7. Gust Front
    a boundary that separates a cold downdraft of a thuderstorm from warm, humid surface air. on the surface its passage resembles that of a cold front.
  8. Stepped Leader
    An initial discharge of electrons that proceeds intermttently toward the ground in a series of steps in a cloud-to-ground lightning stroke.
  9. Mesoscale Convective Complex (MCC)
    • A large organized covective weather system comprised of a number of individual thunderstorms. the size of an MCC an b 1000 times larger than an indibidual ordinary cell thunderstorm.
    • -or simply: a large group of t-storms that organize into a long lasting weather system
  10. Thunder
    • the sound due to rapidly expanding gases along the channel of a lighning discharge.
    • - or simply rapid heating of air near lightning.
  11. Cumulus
    First stage of a thunderstorm
  12. Where do the most Tornados occur?
  13. Funnel Cloud
    • -Afunnel-shaped cloud of condensed water,usually extending from the base of a cumuliform cloud. the rapidly rotating air of the funnel is not in contact with th ground.
    • - A tornado that has not touched the ground
  14. Squall Line
    a line of thunderstorms that form along a cold front or out ahead of it.
  15. F5
    strongest tornado
  16. Mature Stage
    • -Cloud contains both updraft and downdraft.
    • - Second stage of a thunderstorm
  17. Entrainment
    • -the transport of cold dry air by the wind into the side of a developing thunderstorm.
    • -leads to the formation of the downdraft.
  18. What is the life cycle of a thunderstorm?
    • 1.Cumulus stage OR growth stage
    • 2.Mature stage
    • 3.Dissipating stage
  19. what are the 3 conditions that a thunderstorm can have?
    • -damaging winds of 58 mph(microburst)
    • -large hail(over 3/4)
    • -tornado
    • -also have heavy rain, frequent lightning
  20. supercell
    • -a large, long-lasting thunderstorm with a single violently rotaing updraft.
    • -this can lead to the formation of tornadoes.
  21. what is the difference between the fujita scale and the saffir-simpson scale?
    the fujita scale is for messuring tonadoes and the saffir scale is for messuring hurricans.