Download 8.3 PPT Fronts

Do Now
1. What happens at the dew point?
2. In which direction is air pressure exerted?
3. Wind is caused by the movement of air from a
________ pressure to a _________ pressure area
4. What type of weather can you expect at an area of:
– Low pressure?
– High pressure?
Objective & Agenda
SWBAT describe the
weather patterns
associated with warm
and cold fronts
• Knowledge Café
– Due Thursday 5/15
• Tutoring Today @ 230
1. Do Now
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SAT Vocabulary
Weather Tracker
Notes
Guided Practice
Independent Practice
Exit Ticket
Obscure (adjective)
• not discovered or known about; uncertain
EX - his origins and parentage are obscure.
• not clearly expressed or easily understood
EX - obscure references to Proust.
• not important or well known
EX - an obscure religious sect.
• hard to make out or define; vague
EX - I feel an obscure resentment.
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
“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
Do Now
1. What happens at the dew point?
Dew point = the temperature at which water vapor will condense
2. In which direction is air pressure exerted?
Up, down, sideways, all ways
3. Wind is caused by the movement of air from a HIGH pressure
to a LOW pressure area.
4. What type of weather can you expect at an area of:
– Low pressure – clouds & precipitation
– High pressure - clear skies
Let’s update our Weather Tracker!!
Hold on to this for extra credit
• http://www.intellicast.com/Local/Weather.asp
x?location=USNC0121
Guided Notes Expectations
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Eyes & Head Up
Pen/pencil in hand
No talking
Raise your hand to speak
No cell phones out “Out of sight, out of mind”
Stay focused towards our objective
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
Air masses are characterized by
where they FORM:
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Air Masses
• Moisture of source
– Continental: forms over land (DRY)
– Maritime: forms over water (HUMID)
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Air Masses
• Temperature of source
– Polar: forms in polar area (COLD)
– Tropical: forms in tropical area (WARM)
– Arctic: forms over the arctic (COLD)
Artic is colder than Polar
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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 (WET) 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?
mP
cA
mP
cP
mT
cT
mA, mT, mP, cP, cT, cA
mT
Fronts
• The boundary that separates two air masses when they
meet
• There are 4 types of fronts…
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Warm Fronts
1st : Warm air mass meets and
rises above cold air mass
1st Gentle/slower formation
2nd slow and steady rain followed by
hot, humid weather
Cold Fronts
1st Cold air masses pushes under warm air mass
*forms faster than warm front
1st Steeper/quicker formation
2nd Heavy rains and violent thunderstorms,
followed by fair, cool weather
Animation
• http://www.classzone.com/books/earth_scien
ce/terc/content/visualizations/es2002/es2002
page01.cfm?chapter_no=visualization
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
1st Cold front moves faster and passes warm
front, wedges warm air upward
2nd 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
1st Front does not move
Because air flows parallel to front line
2nd Gentle to moderate precipitation
Guided Practice
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You may choose 1 partner to work with
10 minutes to answer 12 questions
2 students per table, facing forward
Talking quietly with partner
We will be discussing the answers afterwards
– You will be expected to answer
• If you finish early, collect a foldable sheet to
summarize information
http://www.youtube.com/watch?v=vPC5i6w3yDI
Guided Response
1. Why does warm air rise at a front?
2. Why does cold air stay close to the ground?
3. What type of weather is associated with a
cold front?
4. What type of weather is associated with a
warm front?
5. List two ways cold and warm fronts are
similar or related to each other:
Guided Practice
1. Why does warm air rise at a front?
Warm air is less dense = rises
2. Why does cold air stay close to the ground?
Cold air is more dense = sinks
Guided Response
1. Why does warm air rise at a front?
2. Why does cold air stay close to the ground?
3. What type of weather is associated with a
cold front?
4. What type of weather is associated with a
warm front?
5. List two ways cold and warm fronts are
similar or related to each other:
Guided Practice
3. What type of weather is associated with a cold
front?
Thunderstorms, heavy rain then clear skies with
lower temperatures and lower humidity
4. What type of weather is associated with a warm
front?
Light rain then clear skies with higher temperatures
& high humidity
Guided Response
1. Why does warm air rise at a front?
2. Why does cold air stay close to the ground?
3. What type of weather is associated with a
cold front?
4. What type of weather is associated with a
warm front?
5. List two ways cold and warm fronts are
similar or related to each other:
Guided Practice
5. List two ways cold and warms fronts are
similar or related to each other:
(a) Associated with Rain
(b) Associated with Clouds
Guided Response
6. Which front moves through an area faster? Why?
Which front moves through an area slower? Why?
7. If a warm front occurs in the winter, what type of
snow storm would it likely bring?
8. If a cold front occurs in the winter, what type of
snow storm would it likely bring?
9. Which type of front would likely bring hail and
possible tornadoes into an area? How do you
know?
10. Describe what happens at a stationary front.
6. Which front moves through an area faster?
Why?
Cold because warm air is easy to push (lighter &
less dense)
6. Which front moves through an area slower?
Why?
Warm air cannot move cold air because it is
heavy & more dense so eventually the warm
air rises above the cold air mass
8. If a warm front occurs in the winter, what
type of snowstorm would it likely bring?
Light snow & long duration
9. If a cold front occurs in the winter, what type
of snowstorm would it likely bring?
A lot of snow because cold air pushes the warm
& moist air up, which causes it to condense &
create precipitation
Guided Response
6. Which front moves through an area faster? Why?
Which front moves through an area slower? Why?
7. If a warm front occurs in the winter, what type of
snow storm would it likely bring?
8. If a cold front occurs in the winter, what type of
snow storm would it likely bring?
9. Which type of front would likely bring hail and
possible tornadoes into an area? How do you
know?
10. Describe what happens at a stationary front.
10. Which type of front would likely bring hail
and possible tornadoes into an area? How do
you know?
Occluded Front
11. Describe what happens at a stationary
front.
Air flows parallel to one another & takes longer
for the front to move through
12. Explain how an occluded front happens.
Warm air is wedged together by cold air.
Northrup’s Knowledge Cafe
• Need to do a Appetizer, Entrée, & Dessert
• Due Thursday 5/15
• Must staple assignment paper on top
– Please indicate which assignments you completed
on the bottom of the paper
• Stay seated, face forward, talk quietly
• Head phones are allowed after two minutes of
transition.
Preparation for End of Class
• Clear desk
• Get ID Badge on
• Put materials back
• Knowledge Café is due Thursday 5/15
• Tutoring today @ 230!
Exit Ticket (4 points total)
1. Why does warm air rise at a front?
2. Which type of front would likely bring hail and
possible tornadoes into an area?
3. Which front moves through an area slower? Why?
Guided Response
6. Which front moves through an area faster? Why?
Which front moves through an area slower? Why?
7. If a warm front occurs in the winter, what type of
snow storm would it likely bring?
8. If a cold front occurs in the winter, what type of
snow storm would it likely bring?
9. Which type of front would likely bring hail and
possible tornadoes into an area? How do you
know?
10. Describe what happens at a stationary front.