Transcript 8.3 PPT Fronts - LambertEarth

WARM-UP
1. Which type of air is more dense, warm air or cold air?
2. Complete the boxes below by using your answer from #1.
What would the air particles look like in cold vs. warm air?
Cold Air
Warm Air
3. Which block above do you think would be stronger or have
more “power?”
Objective
 We will be able to describe the weather patterns
associated with warm and cold fronts
Agenda
 Warm Up
 Fronts Notes
 Practice
 Charlotte weather tracker
 Exit Ticket
Quote of the Day
“The difference between a successful person and others
is not a lack of strength, not a lack of knowledge, but a
lack of will.”
~Vincent T. Lombardi
Quick Review
Layers of the Atmosphere
 Thermosphere
 Mesosphere
 Stratosphere
 Troposphere
Air Masses Notes
 Air mass:
 a large body of air with similar temperatures and
amount of moisture
 As it moves, the characteristics of the air mass change
and so does the weather in the area
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What is an air mass?
This slide doesn’t go in your notes
 An air mass is a large
body of air that has
similar temperature and
moisture throughout
 An air mass gets its
temperature and
moisture from the area
over which it forms (for
example: any air mass
that develops over the
Gulf of Mexico will be
warm and wet because
the Gulf of Mexico is
warm and wet)
Air Masses
 Moisture of source
 Continental: forms over land (DRY)
 Maritime: forms over water (HUMID)
 Temperature of source
 Polar: forms in polar area (COLD)
 Tropical: forms in tropical area (WARM)
 Arctic: forms over the arctic ocean (COLD)
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Practice – Complete the chart
based on what you just learned.
Air Mass
Continental Polar
Maritime Tropical
Maritime Polar
Continental Tropical
Continental Artic
Maritime Artic
Abbreviation
Description
Air Masses
 Continental Polar (cP) Air Mass – Air masses that
form over cold, dry land
 Maritime Tropical (mT) Air Mass - Air masses that
form over warm water
 Maritime Polar (mP) Air Mass - Air masses that
form over cold water.
 Continental Tropical (cT) Air Mass - Air masses
that form over warm, dry land
Types of Air Masses
 Arctic Air (A) – originates from the Arctic Ocean
 Continental Arctic (cA): Produces extremely cold
temperatures and very little moisture. It originates over
the Arctic Ocean in winter.
 Maritime Arctic (mA): From the same source, but less dry
and less cold!
Types of Air Masses
 Polar Air (P) – originates from both
the Pacific and Atlantic Ocean
 Continental Polar (cP): Cold and dry air that
originates from high latitudes. This type of air
brings the cold, dry and clear weather on
perfect winter days and the dry and warm
weather on summer days!
 Maritime Polar (mP): Cool and moist – the air
moves over the Atlantic and Pacific Oceans.
This type of air is unstable which usually
results in showers over the sea and
windward coasts (like the West Coast).
Types of Air Masses
 Tropical Air (T) – originating from the
southern Pacific and Atlantic Oceans
 Continental Tropical (cT): Hot and very dry – it comes
from the arid (dry) and desert regions during the
summer.
 Maritime Tropical (mT): Mild and damp in winter, very
warm and muggy during the summer.
Where would the 6 different
air masses originate?
mA, mT, mP, cP, cT, cA
Fronts
 The boundary that separates two air masses when they meet
 There are 4 types of fronts…
 http://www.youtube.com/watch?v=vPC5i6w3yDI
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ACTIVITY
Type of Front
Warm Front
Cold Front
Occlude Front
Stationary Front
Description of Front
Draw a picture of
symbol
Description of
Weather that
occurs during
this type of
front.
Warm Fronts
 Warm air mass meets and rises above cold air mass
 slow and steady rain followed by hot, humid weather
 Gentle/slower formation
Cold Fronts
 Cold air masses pushes under warm air mass forms
faster
 Heavy rains and violent thunderstorms, followed by fair,
cool weather
 Steeper/quicker formation
FAST FACT
40 to 50 percent of body heat can be lost through
the head (no hat) as a result of its extensive
circulatory network.
Occluded Fronts
 Cold front moves faster and passes warm front,
wedges warm air upward
 Complex; Heavy rains followed by light precipitation for
several days (mix of cold and warm front weather)
Like a horse race!!
(Which rider represents a cold air
mass and which represents a warm
air mass?)
Stationary Fronts
 Front does not move b/c air flows parallel to front line
 Gentle to moderate precipitation
1) What’s the difference between
a warm front and a cold front?
2) Which forms faster, a warm front or a cold front?
3) What type of weather is associated with warm fronts?
4) What type of weather is associated with cold fronts?
5) What happens at a stationary front?
Exit Ticket Time
1. What type of boundary is
illustrated in the map to
the right?
2. What type of weather will
Charlotte be
experiencing?
3. Draw and label the frontal
boundary symbol for warm
fronts and occluded fronts.
Practice with a Partner
METEOROLOGIST
CHALLENGE
 Think you can do it???
 http://willardscience7.pds.wikispaces.net/file/view/curw
x_600x405.jpg/200612280/curwx_600x405.jpg