Do Now1. 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 area4. What type of weather can you expect at an area of:

– Low pressure?– High pressure?

Objective & AgendaSWBAT describe the

weather patterns associated with warm

and cold fronts• Knowledge Café

– Due Thursday 5/15

• Tutoring Today @ 230

1. Do Now2. SAT Vocabulary3. Weather Tracker4. Notes5. Guided Practice 6. Independent Practice7. Exit Ticket

Obscure (adjective) • not discovered or known about; uncertain EX - his origins and parentage are obscure.• not clearly expressed or easily understoodEX - 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 Now1. 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.aspx?location=USNC0121

Guided Notes Expectations

• 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 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

8

Air Masses Notes

9

Air MassesAir masses are characterized by

where they FORM:

• Moisture of source– Continental: forms over land (DRY)– Maritime: forms over water (HUMID)

10

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

11

Air Masses

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?

mA, mT, mP, cP, cT, cA

mP mPcA

cP

mT mTcT

• The boundary that separates two air masses when they meet

• There are 4 types of fronts…

18

Fronts

Warm Fronts

1st : Warm air mass meets and rises above cold air mass

1st Gentle/slower formation2nd slow and steady rain followed by

hot, humid weather

Cold Fronts1st Cold air masses pushes under warm air mass

*forms faster than warm front1st Steeper/quicker formation

2nd Heavy rains and violent thunderstorms, followed by fair, cool weather

Animation

• http://www.classzone.com/books/earth_science/terc/content/visualizations/es2002/es2002page01.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 line2nd Gentle to moderate precipitation

Guided Practice

• 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 Response1. 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 Response1. 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 Response1. 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 Front11. Describe what happens at a stationary front.Air flows parallel to one another & takes longer for the

front to move through12. 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.