Download 7.6 PPT_ Fronts

WARM-UP
1. Which type of air is more dense, warm air or
cold air?
2. Complete the boxes below by drawing
particles for the different air temperatures
using your answer from #1
Cold Air
Warm Air
3. What type of air would sink and why?
4. What type of air would rise and why?
Big Goal
• We will ACT, THINK, and WORK on a college
level
• We will be able to independently score 85% or
Higher on all assessments
Objective
Explain how the interactions of air masses form
frontal boundaries.
Agenda
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Warm Up
Fronts Notes and clips
Whiteboard Challenge
Independent Practice
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
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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Air Masses
• Moisture of source
– Continental: formed over land (DRY)
– Maritime: formed over water (HUMID)
• Temperature of source
– Polar: formed over polar area (COLD)
– Tropical: formed over tropical area (WARM)
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Where would the 4 different air
masses originate?
mT, mP, cP, cT
Fronts
• Form when two air masses meet
• They are the boundary that separates the
two air masses
• There are 4 types of fronts…
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Warm Fronts
• Warm air mass meets and
rises above cold air mass
• Associated with slow and
steady rain, followed by
hot, humid weather
• gentle slope
Cold Fronts
• Cold air masses
overtake and pushes
under warm air mass
• Forms faster
• Heavy rains and
violent thunderstorms,
followed by fair, cool
weather
• Steeper slope
• http://www.teachersdomain.org/resource/mc
k05.sci.ess.watcyc.fronts/
Stationary Fronts
• Front does not move because
air flows parallel to front line,
instead of into each other
• Gentle to moderate
precipitation
• Cloudy grey skies that could
last for days
What do this look like?
• https://www.youtube.com/watch?v=hFAkqHy
FtkA
Lightning Quick Review
1) What is the difference between a warm
front and a cold front?
2) Which forms faster, a warm front or a cold
front?
Which fronts are shown?
Occluded Fronts
• Cold fronts move faster
than warm fronts
• They can catch up to
and overtake a warm
front, wedging the
warm air upward
• Complex; Heavy rains
followed by light
precipitation for several
days
Whiteboard Challenge
• Rules:
– You will be working in a small group
– Every person in your group must participate in answering
the question
– You can only work with the people in your group!
– First group done with the correct answer will get the point
• In order to get the point you have to have the correct answer fully
written out on your board AND explain how you got your answer
to the rest of the class!
– Group with the most points gets a prize!!!!
• In order to get the point you have to have the correct answer AND
explain how you got your answer to the rest of the class!
#1
Draw the symbol for a WARM FRONT
#2
Which type of front brings heavy rains
and violent thunderstorms?
Cold Front
#3
Which air mass has a more gentle
slope?
Warm Front
#4
What is the symbol for a STATIONARY
front?
#5
Why does warm air rise at a front?
Because it is less dense and less dense air will rise
#6
Why does cold air stay close to the ground?
Cold air is more dense and will sink closer to the ground
#7
What is the symbol for an OCCLUDED
front?
#8
Describe the weather that follows a warm front.
Hot, humid, warm weather follows a warm front
#9
What weather follows a cold front?
Fair, mild, cool weather follows a cold front
# 10
Which front does not move because
air flows parallel to front line, instead
of into each other?
Stationary Front
# 11
Draw AND Label the symbol for EACH FRONT:
Warm:
Cold:
Stationary:
Occluded:
# 12
Compare and contrast a COLD front and a
WARM front. You must have at least 2 points
for each!
Gentle Slope
Slow Steady Rain
Warm, humid Air follows
Steep Slope
Heavy rain and violent
thunderstorms
Fair, colder air follows
Independent Practice
• On the back of your notes, quietly complete
your worksheet
• If you have questions:
– Use your notes
– Quietly ask a neighbor
– Ask me!
• When you are done, go to the front board to
get the answer key and check your answers at
your seat. When you are done, return the key
to the board.
Exit Ticket
• Silently and Independently complete your exit
ticket. Do not use your notes.