Snowstorms

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Snowstorms

• By Zach Meyers

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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

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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.

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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.

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• 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.

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Quiz

• At what temperature is frost created?

32F
0F
11
WRONG
GO BACK
12
RIGHT
GO ON
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Next Question

• How many ice crystals does each snowflake have?

147
200
14
Right
Go on
15
Wrong
Go back
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Bibliography

• Resources
• www.delicious.com/jenn1218
• weather whiz kids
• Storms
• Google (snowstorms)