Types of Severe WEATHER and Fronts

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Types of Severe WEATHER and Fronts

• Objective
• Can I use meteorological data to predict weather?

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Weather
A daily change in the condition of the atmosphere
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Our Sun

• The sun provides the
• that is responsible for all of
  Earths weather

ENERGY
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Types of weather
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Severe weather
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Tornado

• A severe storm that forms as rapidly rotating
  funnel cloud.
• The peak season in Tennessee is March May

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Tornadoes

• Only happen in 1 of all thunderstorms.
• Small, spinning column of air that has high wind
  speeds and low central pressure and that touches
  the ground.
• http//youtu.be/3Qu9wR03GVA

Formed from Cumulonimbus clouds
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WEIRD SCIENCE

• People have reported seeing naked chickens
  after tornadoes strike rural areas. A likely
  explanation is that tornadoes cause chickens to
  shed their feathers, or molt. Chickens often molt
  when attacked. As the chickens molt, the strong
  tornadic winds blow their feather off.

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Cool Facts

• About 75 of the worlds tornadoes occur in the
  US.
• Usually a tornado starts off as a white or gray
  cloud but if it stays around for a while, the
  dirt and debris it sucks up eventually turns it
  into black one.
• The United States have an average of 800
  tornadoes every year .
• A Tornado in Oklahoma once destroyed a whole
  motel. People later found the motels sign in
  Arkansas.

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Tropical Storms/Hurricanes

• Low pressure storm with high winds from the ocean

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Categories of Hurricanes

• 1. 74-95 mph minimal hurricane
• 2. 96-110 mph moderate hurricane
• 3. 111-130 mph extensive hurricane
• 4. 131-155 mph extreme hurricane (Andrew)
• 5. gt155 mph catastrophic hurricane

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Hurricanes

• Large, rotating tropical weather system.
• It begins as a group of thunderstorms moving over
  tropical ocean waters.
• The source of energy is the evaporation of ocean
  water.
• As the warm, moist air rises, the water vapor
  condenses and releases large amounts of energy.
• Catastrophic hurricane video

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Cool Facts

• Hurricanes are the most powerful storms on Earth.
• In the Pacific Ocean, Hurricanes are generally
  known as typhoons. In the Indian Ocean they are
  called tropical cyclones.
• Hurricanes are the only weather disasters that
  have been given their own names.
• Hurricane season is from June to November when
  the seas are at their warmest and most humid,
  which are ripe conditions for a hurricane to
  develop.

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High Air Pressure

• Good, cooler weather

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Low Air Pressure

• Warmer, bad weather

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Barometer

• Measures air pressure.

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Air Pressure
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Fronts

• The point where two air masses meet
• Causes change in weather

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Warm Front

• Warm air mass
• Will rise over cool air mass and gradually
  replaces the cold air.
• Cause light rain followed by hot humid weather

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Cold Front

• A cold air mass
• Cold front will push under warm front
• Causes severe weather- heavy rains and
  thunderstorms
• Followed by cool weather

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Occluded Front

• Forms when a warm air mass is caught between two
  colder air masses.
• Has cool temperatures and large amounts of rain
  and snow.

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Stationary Front

• Forms when a cold air mass meets a warm air mass.
  Both air masses do not have enough force to life
  the warm air mass over the cold.
• Days of cloudy, wet weather.

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Review Questions
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1.Can you show me a cold front on this map?
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2. Can you find a warm front on this map?
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3. Can you find the occluded front on this map?
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4. Can you find the stationary front on this map?
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5.What type of weather is the northeast having?
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• 6. Sharon woke up on a sunny morning and ate
  breakfast. Then she looked outside and saw tall,
  quickly-forming clouds. The clouds looked ready
  to rain. When she turned on the TV, she saw just
  what she thought--a forecast for sudden rains.
  What most likely caused the change in weather?

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Storm Chasers

• http//ultimatechase.com/

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Review
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1.What type of weather is the northeast having?
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• 2. Sharon woke up on a sunny morning and ate
  breakfast. Then she looked outside and saw tall,
  quickly-forming clouds. The clouds looked ready
  to rain. When she turned on the TV, she saw just
  what she thought--a forecast for sudden rains.
  What most likely caused the change in weather?

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3. If the wind was 135 mph what classification of
hurricane would it be
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• 4. Which of the following instruments measures
  air pressure?
• a. thermometer
• b. barometer
• c. anemometer
• d. windsock

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• 5. On a summer evening, a barometer reading shows
  a gradual increase in air pressure. The humidity
  is 80. The thermometer reading is slightly
  increasing. Based on these data, what type of
  weather should be expected for the next day? Why

Clear and Sunny
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• 6. A student observes a clear sky and a
  temperature reading of 35 Celsius at 800 a.m.
  What is the most likely prediction about the
  days weather?

a. the days weather will be cold c. the days weather will be hot
b. the days weather will be rainy d. the days weather will be snowy
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• 7. A meteorologist used radar to analyze the wind
  during a storm in the central plains of the
  United States. The winds were measured at 145
  miles per hour and were moving in a circular
  pattern. According to the data, which event was
  the meteorologist most likely observing?

a. tornado c. rainbow
b. lightning storm d. cloud formation
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• 8. The weather tonight will be dominated by air
  movement that is caused by air moving from areas
  of high to low pressure. This describes
• Blizzard
• Warm front
• Tornado
• Wind

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• 9. Next week, you can expect this warm air mass
  to meet this cold air mass over the southern part
  of the state and bring rain and snow. This best
  describes
• Cold front
• Warm front
• Occluded front
• Stationary front

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• 10. What type of weather will a warm front bring
  with it?
• Cold and sunny
• b. Cold and rainy
• c. Cold and snowy
• d. Sunny