Fronts & Storms

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Fronts Storms

• by Mrs. Wisher
• WRITE EVERYTHING IN GREEN

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Air Masses

• air mass a huge body of air that has similar
  temperature, humidity, and air pressure
  throughout
• maritime air masses forms over oceans
• continental air masses form over land
• polar air masses form in cold regions and
  tropical air masses form in warm areas

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Fronts

• Fronts occur when 2 air masses meet but do not
  mix
• When fronts combine they often cause storms or
  changes in weather

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Cold Fronts

• cold fronts when a fast moving cold air mass
  runs into a slow moving war air mass, the cold
  dense air slides underneath
• cold fronts cause cloudy skies with possible
  heavy rain or thunderstorms colder temperatures

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Warm Fronts

• a moving warm air mass collides with a slow
  moving cold air mass
• weather can be humid or dry but will be warmer

warm air
cold air
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Stationary Fronts

• When a cold and warm air mass meet but do not
  have the force to move each other
• Weather can be cloudy or rainy for an extended
  period of time.

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Occluded Front

• Occurs when a warm air mass is trapped between 2
  cold air masses
• This pushes the warm air mass upwards and the
  temperature cools

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Storms

• storm a violent disturbance in the atmosphere
• usually cause changes in air pressure

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Thunderstorms

• Thunderstorms form within large cumulonimbus
  cloud
• lightning a sudden energy discharge from a
  cloud to another cloud or the ground
• thunder the sound produced by the rapid heating
  of the air after a lightning strike

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Tornados

• Tornados are funnel shaped clouds with rotating
  speeds of up to 480 km per hour
• They form in the same cumulonimbus clouds as
  thunderstorms
• Most tornados form in the Great Plains which is
  known as Tornado Alley.

tornado images
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Hurricanes

• A tropical storm with winds higher than 119 km
  per hour
• Hurricanes begin over warm water as a tropical
  disturbance

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Blizzard

• A snowstorm with high speed sustained winds.
• Wind speeds over 35 miles per hour and lasts at
  least 3 hours.

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