Transcript Chapter 17 - WordPress.com

CHAPTER
NEW CHAPTER
Weather Fronts and Storms
the BIG idea
The interaction of air masses causes changes in weather.
Weather Fronts and Storms
17.1 Weather changes as air masses move.
17.2 Low-pressure systems can become storms.
17.3 Vertical air motion can cause severe storms.
17.4 Weather forecasters use advanced technologies.
CHAPTER OUTLINE
CHAPTER RESOURCES
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
VOCABULARY
How do air masses get their names? How do they move?
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
Air masses meet and produce fronts, which can
bring lowered pressure with precipitation and stormy
weather. Fronts can be cold, warm, or stationary.
Cold Front
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
Weather changes as air masses move.
Often, a warm front brings many hours of steady
rain or snow. After the front passes, the air is
warmer.
Warm Front
.
CHAPTER HOME
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
Stationary fronts occur when air masses first
meet or when a cold or warm front stops moving.
Which ever ones starts to move gets that name.
Stationary Front
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
A low-pressure system can develop wherever
there is a center of low pressure. One place this
often happens is along a boundary between a
warm air mass and a cold air mass.
• Part of the boundary between the air masses
moves south and becomes a cold front.
• Part of the boundary moves north and
becomes a warm front.
• A center of low pressure forms where the ends
of the two fronts meet.
VISUALIZATION
CLASSZONE.COM
See how air moves in warm
fronts and cold fronts.
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
Large weather systems generally move with the
pattern of global winds—west to east over most
of North America. But, within a weather system,
winds can blow in different directions.
Our stormageddon occurred because the moist
warm air from the south met a polar vortex and
caused all the precipitation to freeze as it fell.
Most large storms in Michigan occur when the
jet stream slows down and dips down almost to
the Gulf of Mexico and brings all that warm,
moist air up north.
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
CHAPTER
RESOURCES
SECTION
OUTLINE
17.2
KEY CONCEPT
CHAPTER HOME
Low-pressure systems can become storms.
Hurricanes and winter storms develop from lowpressure systems. Hurricanes form over warm
ocean water near the equator.
VOCABULARY
tropical storm
hurricane
storm surge
blizzard
VISUALIZATION
Watch the progress of a
huricane.
CHAPTER
RESOURCES
SECTION
OUTLINE
17.2
KEY CONCEPT
CHAPTER HOME
Low-pressure systems can become storms.
VOCABULARY
Ice storms are a type of winter storm that can be
dangerous due to its precipitation (freezing rain).
tropical storm
hurricane
storm surge
blizzard
CHAPTER
RESOURCES
SECTION
OUTLINE
17.3
KEY CONCEPT
CHAPTER HOME
Vertical air motion can cause severe storms.
Rising moist air can produce thunderstorms. The
up-and-down motion of air in a thunderstorm can
produce a tornado.
VOCABULARY
thunderstorm
tornado
CHAPTER
RESOURCES
SECTION
OUTLINE
17.3
KEY CONCEPT
CHAPTER HOME
Vertical air motion can cause severe storms.
F0 Tornadoes are barely noticed but occur more
frequently while an F5 are the rarest. Most occur in
the “Tornado Alley” in the United States.
VOCABULARY
thunderstorm
tornado
CHAPTER
RESOURCES
SECTION
OUTLINE
17.4
CHAPTER HOME
KEY CONCEPT
Weather forecasters use advanced
technologies.
Weather information comes from many sources.
VOCABULARY
meteorologist
isobar
CHAPTER
RESOURCES
Ground
Station
Radar
Station
Satellite
SECTION
OUTLINE
17.4
KEY CONCEPT
CHAPTER HOME
Weather forecasters use advanced
technologies.
Meteorologists use weather data and computer
models to forecast weather.
VOCABULARY
meteorologist
isobar
CHAPTER
RESOURCES
SECTION
OUTLINE
17.1
KEY CONCEPT
CHAPTER HOME
Weather changes as air masses move.
I. Weather changes as air masses move.
A. Air masses are large bodies of air.
1. Characteristics of an Air Mass
2. Movement of an Air Mass
B. Weather changes where air masses meet.
VOCABULARY
air mass
front
high-pressure
system
low-pressure
system
1. Fronts and Weather
2. High-Pressure Systems
3. Low-Pressure Systems
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
17.2
KEY CONCEPT
CHAPTER HOME
Low-pressure systems can become
storms.
II. Low-pressure systems can become storms.
VOCABULARY
tropical storm
A. Hurricanes form over warm ocean water.
hurricane
1. Formation of Hurricanes
storm surge
2. Effects of Hurricanes
blizzard
B. Winter storms produce snow and ice.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
17.3
KEY CONCEPT
CHAPTER HOME
Vertical air motion can cause severe storms.
III. Vertical air motion can cause severe storms.
VOCABULARY
thunderstorm
A. Thunderstorms form from rising moist air.
tornado
1. Formation of Thunderstorms
2. Effects of Thunderstorms
B. Tornadoes form in severe thunderstorms.
1. Effects of Tornadoes
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
17.4
KEY CONCEPT
CHAPTER HOME
Weather forecasters use advanced
technologies.
IV. Weather forecasters use advanced technologies.
A. Weather data come from many sources.
VOCABULARY
meteorologist
isobar
B. Weather data can be displayed on maps.
1. Air Pressure on Weather Maps
2. Satellite Images and Special Maps
C. Forecasters use computer models to predict
weather.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
CHAPTER HOME
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