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Snowstorms

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Snowstorms usually form when an air mass of cold, dry, Canadian air moves south ... into ice without first becoming a liquid high in the atmosphere at a tempera ... – PowerPoint PPT presentation

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Title: Snowstorms


1
Snowstorms
  • By Zach Meyers

2
Table of Contents

  • 1. How snowstorms form
  • 2. Blizzards
  • 3. Snowflakes
  • 4. Sleet
  • 5. Frost
  • 6. How is snow formed?
  • 7. Freezing rain
  • 8. Quiz
  • 9. Bibliography

3
How Snowstorms Form
  • Snowstorms usually form when an air mass of
    cold, dry, Canadian air moves south and interacts
    with a warm, moist air mass moving north from the
    Gulf of Mexico.

4
Blizzards
  • A blizzard is a long-lasting snowstorm with very
    strong winds and intentional snowfall. You need 3
    things to have a blizzard cold air at the
    surface of lots of moisture, and lift. Warm air
    must rise over cold air.

5
Snowflakes
  • Each snowflake is 6-sided.
  • Each snowflake has as many as 200 ice crystals.
  • As the snow crystals grow they become heavier and
    fall toward the ground.

6
Sleet
  • Sleet is just rain drops that freeze into ice
    pellets before reaching the ground. Sleet usually
    bounces when hitting a surface and does not stick
    to objects. However, it can accumulate like snow
    and cause a hazard to mot-
  • orists.
  • Sleet freezes, and unfreezes before it hits the
    ground. (Or someone's head!)

7
Frost
  • Frost is ice crystals that form on a surface,
    like the ground or leaves of a plant. Frost is
    created when the air temperature drops below
    freezing and the water vapor in the air freezes
    into ice crystals.

8
How is snow formed?
  • Snow is commonly formed when water vapor
    undergoes deposition, which is when water vapor
    changes directly into ice without first becoming
    a liquid high in the atmosphere at a tempera-
  • ture of less than 32 degrees Fahrenheit and
    then falling to the ground.

9
  • Freezing Rain
  • Freezing rain is just rain that falls onto a
    surface with a temperature below freezing. This
    causes it to freeze to surfaces, such as trees,
    cars, and roads, forming a coating or glaze of
    ice. Even small accumulations on ice can cause a
    significant hazard.

10
Quiz
  • At what temperature is frost created?

32F
0F
11
WRONG
GO BACK
12
RIGHT
GO ON
13
Next Question
  • How many ice crystals does each snowflake have?

147
200
14
Right
Go on
15
Wrong
Go back
16
Bibliography
  • Resources
  • www.delicious.com/jenn1218
  • weather whiz kids
  • Storms
  • Google (snowstorms)
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