Transcript Chapter 4 Water and Atmosphere

Weather
Table of Contents
Water in the Atmosphere
Clouds
Precipitation
Air Masses
Storms
Predicting the Weather
Water in the Atmosphere
The Driest Place on Earth
There are places in the Atacama Desert where a single drop of rain has
never been measured.
Water in the Atmosphere
The Water Cycle
Where do the words in the Word
Bank go to describe the water
cycle?
Water in the Atmosphere
Relative Humidity
Relative humidity is affected by temperature.
Clouds
How Clouds Form
Clouds form when warm, moist air rises and cools.
Clouds
Cloud Types
There are many
different types of
clouds.
Clouds
Clouds and Weather
What kind of weather can be predicted from each type of cloud?
Precipitation
Water Droplets
Cloud droplets condense to become larger droplets.
Precipitation
Rain Gauge
The rain gauge, measuring in centimeters,
collects ten times the actual depth of rain
that falls.
Precipitation
Freezing Precipitation
What would be the air and ground temperature ranges for each type of
precipitation?
Air Masses
Types of Air Masses
Air masses can be
classified according to
temperature and humidity.
Air Masses
North American Air Masses
Air masses can be warm or cold,
and humid or dry.
Air Masses
Types of Fronts
What type of weather is
brought by each front?
Air Masses
Cyclones and Anticyclones
Which image is a cyclone and which is an anticyclone? What is the air
motion direction of each?
Storms
Lake-Effect Snow
As cold, dry air moves across the warmer water, it becomes more humid
as water vapor evaporates from the lake surface. When the air reaches
land and cools, lake-effect snow falls. Which cities receive lake-effect
snow?
Storms
How Thunderstorms Form
A thunderstorm forms when warm, humid air rises rapidly within a
cumulonimbus cloud. What is indicated by the blue and red arrows?
Storms
Hurricane
Where is the eye of the hurricane? Where are the strong and weak
areas?
Storms
Hurricane Katrina
The diagram shows
the path of Hurricane
Katrina. What are
possible paths the
hurricane could have
taken after reaching
land?
Storms
Tornado Formation
About 1,200 tornadoes occur in the United States every year. Weather
patterns on the Great Plains result in a “tornado alley.”
Storms
Types of Tornado Damage
Predicting the Weather
Weather Map Symbols
The tables below show what various weather symbols represent.
Predicting the Weather
Newspaper
Weather Map
The symbols on this map
show fronts, highand low-pressure areas,
the
high and low
temperature readings for
different cities, and
precipitation. The color
bands indicate different
temperature ranges.
Predicting the Weather
Weather Map