key learning: the unequal heating and cooling of the earth’s surface causes our weather and...

Key Learning: The unequal heating and cooling of the Earth’s surface causes our weather and climate differences.

Unit Essential Question: What causes weather and climate differences?

Weather and Climate UnitPart 3: Predicting the Weather


Concept: Predicting the Weather

Lesson Essential Questions:1. What factors influence the

weather in the United States?2. How do we use weather data

to make short term weather predictions?

3. How can we use weather maps to make weather forecasts?

Vocabulary:

High Pressure System

Low Pressure System

Air Mass

Fronts/Frontal Boundary

You will be able to answer these questions by the end of Part 3

You should already know what these words mean. You will be able to use them in your responses and discussions throughout the unit


Homework Assignment # 8In the Weather and Climate readings and assignments…

Read pages 26-28 and complete the assignment on page 28


Warm Up # 1: Now that you understand the ins and outs of weather, what are the important factors you must look at to describe the weather and to make future weather predictions?


Types of Air Masses


Air Mass Where it forms Temperature

Humidity

mT

mP

cT

cP


Type of Front How it forms Weather Cold Front

Mass of cold air meets and replaces mass of warm air

Violent storms followed by good weather Fast moving 2-5 hrs

Warm Front

Mass of warm air overtakes cold air mass and moves over it

Rain and showers followed by hot, humid weather Slow moving-2 days

Occluded Front

Cold front overtakes a warm front

Less extreme weather than cold or warm fronts

Stationary Front

Warm air mass meets cold air mass and no movement occurs

Rain may fall for many days.


Warm Front: Mass of warm air overtakes cold air

Clouds: cirrus are seen first, then cirrostratus, then altostratus, and finally nimbostratus.

7 things that happen as a warm front passes along the ground:

1. Temperature increases

2. Pressure decreases

3. Wind direction and speed change

4. Winds ahead of the warm front generally blow from east-

southeast, while behind the front, winds shift and blow from south-

southwest.

5. Moves northeastward

6. Movement is slow (about 2 days)

7. Weather you usually get with a warm front is steady rain and

showers


Cold Front: Mass of cold air meets and replaces mass of warm air

Clouds: First cumulus, then altocumulus, then finally cumulonimbus.

5 things that happen as a cold front passes along the ground

1. Temperature decreases

2. Pressure increases

3. Winds are from the north-northwest

4. Weather associated with a cold front is stormy.

5. Speed of a cold front: is 2-5 hours, stormy weather followed by cool

dry conditions


You will now watch a demonstration on how

fronts work. Pay attention to what happens to

the hot water mass and the cold water mass.

You will have to describe what happens (in

terms of weather) after the demonstration.


Complete Summary # 1: Look at the satellite image of a pressure system/front moving west to east along the eastern United States. Complete the paragraph below.


Warm Up # 2: How are weather maps useful in determining weather forecasts?


Weather MapsDraw today’s weather map of the United States. Be sure to include any symbols you see. You should use color wherever possible! Then answer the questions.

http://weather.unisys.com/index.php

http://weather.unisys.com/


Warm Up # 3: Draw a station model to represent the current weather conditions.


Analyzing Weather Data

I have been collecting a month’s worth of weather data. Analyze that

data by completing the questions and providing evidence from the weather

log.Your group will then be responsible for drawing 4 days’ worth of station

models.


Complete Summary # 2: Look at the data for three different locations. Use the three sets of data to make a 24-hour forecast for each location. (Some hints are provided below)

Location Wind Direction

Pressure(mb)

Press. Change

Clouds Temp. (F)Change

Rel. Hum.Change

1 S-SE 1020 1017 Cirrus toAltostratus

16 to 18 91 % to 98%

2 NW 1007 1011 Cumulonimbusto cumulus

Steady at 10

90% to 79%

3 SW-NW

1020 1020 Cumulus 12 to 13 84% to 76% Rising pressure brings better weather and fair skies.

Falling pressure brings poor weather The closer the temperature and dew point, the greater the humidity

and greater likelihood of precipitation The further apart the temperature and dew point, the drier the air

and greater likelihood of fair weather Wind shifts to the east in Delaware often indicate upcoming rainy

weather Clouds changing from high cirrus to lower clouds indicate warm

fronts Clouds changing from cumulonimbus to cumulus indicate cold front

weather

key learning: the unequal heating and cooling of the earth’s surface causes our weather and...

Documents

weather weather

weather forecasts

stormy weather

showers weather

weather data

outs of weather

terms of weather

climate unitpart