Storms

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Storms
Storm- A disturbance in the atmosphere
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How do Thunderstorms Form?

• Thunderstorms form when a fast moving cold front
  violently forces warm air to rise.
• This forms cumulonimbus clouds

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Cumulonimbus Clouds
Massive amounts of convection
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Lightning and Thunder

• Lightning forms in cumulonimbus clouds
• Fast moving cold fronts create huge amount of
  positive negative charges
• Explain why do you see lightning before you hear
  it (thunder)?

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Kinds of Lightning

• forked lightning
• sheet or streak lightning
• ball lightning

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Forked Lightning
forked
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Sheet or Streak Lightning
single bolts
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Ball Lightning
balls of flame created
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Tornadoes

• Tornadoes- fast whirling, funnel shaped clouds
  that touchdown to Earths surface

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How do Tornadoes Form?

• Tornadoes form when fast moving cold air masses
  slide underneath warm air masses
• This creates a cumulonimbus cloud

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Tornado Alley
Cold Dry Polar Air
Warm Humid Tropical Air
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Yearly Average of Tornadoes in the U.S.
Tornado Alley
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Measuring Tornadoes

• Tornadoes are measure on the Fujita scale

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Tornadoes in Action
funnel clouds reach down
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Very Rare F5 Tornadoes
huge base (some have been 1 mile in diameter)
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Tornado Damage
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Tornado Damage
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Hurricanes

• Hurricane- is a tropical storm that has winds
  speeds over 74 mph.
• A hurricane is an extremely low pressure air mass
  (cyclone- counterclockwise rotation)-
• Hurricanes need moisture for fuel

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How Hurricanes Form

• Hurricanes form over warm tropical water
• The suns energy causes rapid evaporation
  creating an extreme low pressure air mass

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Convection
Eye- cool air descending
Convection
LOW PRESSURE
LOW PRESSURE
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Hurricane Photos from Space
Hurricane Eye
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Hurricane Images Using Doppler Radar
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The Track of Hurricane Andrew-1992
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Hurricane Katrina 2005
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Hurricane Scale
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Hurricane Damage
Hurricanes cause massive flooding
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Hurricane Katrina
New Orleans neighborhood 2005
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Flooding 1 Danger with Hurricanes
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Hurricane Winds are Very Powerful
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Hurricane Damage
Hurricane damage often costs hundreds of
millions sometimes billions of dollars in
repairs- it also causes loss of life and can
devastates families
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