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Severe Storms

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Classified under severe storms are thunderstorms, tornadoes, and hurricanes. Thunderstorms Thunderstorm produces thunder and lightening and possibly heavy rain ... – PowerPoint PPT presentation

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Title: Severe Storms


1
Severe Storms
  • Classified under severe storms are thunderstorms,
    tornadoes, and hurricanes.

2
Thunderstorms
  • Thunderstorm produces thunder and lightening
    and possibly heavy rain, gusty winds, and hail.
  • Can be local, single cloud storms, or multiple
    cells along a cold front.
  • Development of thunderstorms involve 3 stages.
  • Cumulus Stage warm, moist air is moved upward.
  • Mature Stage (about 1 hour later) heavy
    precipitation begins with gusty winds, lightning,
    and hail.
  • Dissipating Stage cooling of the air ? the
    storm to dies down.

3
Tornadoes
  • Tornadoes violent windstorms that form a
    rotating column of air (vortex) that extends
    downward from a cumulonimbus cloud.
  • Most form during thunderstorms.
  • Begins with a strong wind high up in the
    atmosphere that causes winds lower in the
    atmosphere to roll horizontally ?strong
    thunderstorm updrafts will cause the mesocyclone
    to tilt until it is standing upright.
  • The intensity of a tornado is based on the wind
    speed and the estimated damage.
  • F0 ? F5 (see page 574)

4
Hurricanes
  • Hurricane whirling tropical cyclone that
    produces winds of at least 119 km (74 mph) in the
    U.S.
  • Develop in late summer when the water
    temperatures are warm enough to provide enough
    heat and moisture to the air.
  • Tropical Depression (disturbance) first stage
    with several thunderstorm clusters and little or
    no cloud rotation.
  • Tropical Storm winds begin to rotate and
    thunderstorms progress.
  • Hurricane rotating cloud with winds of 119
    km/hour or more.
  • Intensity of a hurricane is based on the wind
    speeds.
  • Category 1 is lowest with wind speeds of 119
    km/hr.
  • Category 5 is the most intense with wind speeds
    above 249 km/hr. (see page 577)

5
Hurricanes (contd)
  • Eye center of the hurricane where air is
    subsiding (sinking) and being warmed.
  • Eye Wall the layer of clouds that surrounds the
    eye, where winds are fastest and rainfall is
    greatest.
  • Rain Bands clouds that extend outward from the
    eye wall and circulates and rotates around the
    storm cell.
  • Storm Surge a dome of water directly underneath
    the eye of the hurricane which can cause severe
    flooding as the storm hits landfall.

6
Assignment
  • Warm and Cold Front Questions
  • ? A satellite image of Hurricane Fran
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