Warm Air Mass
Geography
Lesson 40-47
TOPIC:
Weather and Climate
Objectives:
Story Telling Project
Africa – Organisation, preparation and presentation
Map of Africa – preparation for test
Weather and climate
How air masses affect weather
What fronts are and how they affect weather
Depressions affect the weather
Ocean currents affect weather
AIR MASSES
The movement is made in huge blocks
These can be warm, cold, damp or dry – depending where it comes from.
Air masses from the north pole will be cold and dry
Move from the UK, therefore producing cold dry weather
Air masses
From a warm ocean will be warn and damp
Air masses meet and CLASH and this causes weather change
PORTUGAL
Air masses coming from the Atlantic Ocean are warm as they move over the equator, causing the south of Portugal to be warm.
In the north air masses may be subject to the Canary current/Northern winds which are cold, bringing in cold air into Northern Portugal
FRONTS
Fronts are the leading edges of air masses.
Symbolised by:
RED frills for a WARM front
BLUE teeth for the COLD front
WARM FRONT: warm air mass is arriving
When a warm front passes through, the air becomes noticeably warmer and more humid than before
COLD FRONT: cold air mass is arriving
The air behind a cold front is colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.
Because cold fronts move quickly, the weather associated with them typically also moves quickly, and passes over a particular location in a short period of time. Turbulence begins with the cold front.
DEPRESSION: Usually the cause of storms
This occurs when a cold air mass meets a warm air mass.
The cold air mass moves the warm air mass and pushes it up.
The warm air condenses creating dark clouds and rain
This quick meeting of the two air masses causes strong winds = storm.
HMK:
Your turn:
Pg 43: N2
Pg 45: N2,5
Page 43
2.
a. B. This air mass
Lesson 40-47
TOPIC:
Weather and Climate
Objectives:
Story Telling Project
Africa – Organisation, preparation and presentation
Map of Africa – preparation for test
Weather and climate
How air masses affect weather
What fronts are and how they affect weather
Depressions affect the weather
Ocean currents affect weather
AIR MASSES
The movement is made in huge blocks
These can be warm, cold, damp or dry – depending where it comes from.
Air masses from the north pole will be cold and dry
Move from the UK, therefore producing cold dry weather
Air masses
From a warm ocean will be warn and damp
Air masses meet and CLASH and this causes weather change
PORTUGAL
Air masses coming from the Atlantic Ocean are warm as they move over the equator, causing the south of Portugal to be warm.
In the north air masses may be subject to the Canary current/Northern winds which are cold, bringing in cold air into Northern Portugal
FRONTS
Fronts are the leading edges of air masses.
Symbolised by:
RED frills for a WARM front
BLUE teeth for the COLD front
WARM FRONT: warm air mass is arriving
When a warm front passes through, the air becomes noticeably warmer and more humid than before
COLD FRONT: cold air mass is arriving
The air behind a cold front is colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.
Because cold fronts move quickly, the weather associated with them typically also moves quickly, and passes over a particular location in a short period of time. Turbulence begins with the cold front.
DEPRESSION: Usually the cause of storms
This occurs when a cold air mass meets a warm air mass.
The cold air mass moves the warm air mass and pushes it up.
The warm air condenses creating dark clouds and rain
This quick meeting of the two air masses causes strong winds = storm.
HMK:
Your turn:
Pg 43: N2
Pg 45: N2,5
Page 43
2.
a. B. This air mass