How do fronts & air masses
change the weather?
Air masses
 It’s a large body of air which have the same
temperature & same
 amount of water vapor.
 Air masses can be formed over:
1) Land
Dry air mass

2) Water
of moisture”

Wet air mass “with lots
Types of air masses

Cold & dry

Cold & wet

Causes cool
weather with
no or little
precipitation

Causes cool
weather with...
Fronts
 It is the border between one mass & another.
Types of fronts
Cold front:
-

It is formed when a cold air mass pushes under
a warm air mass.
The cold air mass forces th...
Warm front:
-

It is formed when a warm air mass pushes a
cold air mass.
The warm air mass slides up over the cold air.
It...
Difference between cold & warm fronts
Stationary front:
-

-

It is formed when fronts don’t move for many
days.
It causes storms & rain “Flooding” for many
day...
Weather map
 It helps us to know what the weather is like in an
area.
{Made from information collected from weather stati...
Symbols on a weather map





Sunny



Sunny & cloudy



Rainy
Colored areas on a weather map
 Red

Very hot weather

 Orange

Warm weather

 Yellow

Mild weather

 Green

Cool

 B...
Weather Forecast
 Is to predict the weather conditions.
Can you read this weather map?
Severe storms
(1) Tornadoes:
-It’s a fast spinning spiral strong wind that stretches
From the cloud of the thunderstorm to...
(2) Blizzards:
- They are severe snow storms that can last for
hours.
- Blizzards have strong winds, blowing snow &
very l...
(3) Hurricanes:
- They are formed over warm water of oceans, it
has a speed of 119 km per hour.
- Hurricanes can last for ...
Weather Safety
•

There are certain weather safety rules
that we should follow in order to be
safe from severe weather con...
Examples
 Watching TV during severe “bad” weather to
get directions about what to do.
 Weather sirens are turned on when severe
storm is detected.
 Flags are used to warm people from a coming
hurricane.
 Evacuation signs are used to tell people to
evacuate “empty” an area when a hurricane is
coming.
How do fronts & air masses change the
How do fronts & air masses change the
How do fronts & air masses change the
How do fronts & air masses change the
How do fronts & air masses change the
How do fronts & air masses change the
How do fronts & air masses change the
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How do fronts & air masses change the

  1. 1. How do fronts & air masses change the weather?
  2. 2. Air masses  It’s a large body of air which have the same temperature & same  amount of water vapor.
  3. 3.  Air masses can be formed over: 1) Land Dry air mass 2) Water of moisture” Wet air mass “with lots
  4. 4. Types of air masses Cold & dry Cold & wet Causes cool weather with no or little precipitation Causes cool weather with snow. Warm & dry Warm & wet Causes warm weather with little or no precipitation Causes precipitation
  5. 5. Fronts  It is the border between one mass & another.
  6. 6. Types of fronts Cold front: - It is formed when a cold air mass pushes under a warm air mass. The cold air mass forces the warm air mass up quickly. Thick clouds forms as the warm air rises & cools & rain falls. Cold fronts often bring stormy weather.
  7. 7. Warm front: - It is formed when a warm air mass pushes a cold air mass. The warm air mass slides up over the cold air. It forms layers of clouds. Warm fronts often bring steady rain , followed by clear warm weather.
  8. 8. Difference between cold & warm fronts
  9. 9. Stationary front: - - It is formed when fronts don’t move for many days. It causes storms & rain “Flooding” for many days. No change in the weather is followed by stationary front.
  10. 10. Weather map  It helps us to know what the weather is like in an area. {Made from information collected from weather stations}
  11. 11. Symbols on a weather map     Sunny  Sunny & cloudy  Rainy
  12. 12. Colored areas on a weather map  Red Very hot weather  Orange Warm weather  Yellow Mild weather  Green Cool  Blue Very cold
  13. 13. Weather Forecast  Is to predict the weather conditions.
  14. 14. Can you read this weather map?
  15. 15. Severe storms (1) Tornadoes: -It’s a fast spinning spiral strong wind that stretches From the cloud of the thunderstorm to the ground. -Tornadoes can have wind speeds greater than 400 km per hour. -USA has more tornadoes in a year than any other Place.
  16. 16. (2) Blizzards: - They are severe snow storms that can last for hours. - Blizzards have strong winds, blowing snow & very low air temperature “Cold”
  17. 17. (3) Hurricanes: - They are formed over warm water of oceans, it has a speed of 119 km per hour. - Hurricanes can last for weeks at the sea. - The wind of the hurricane spins around the calm center of the storm called: “Eye” - Hurricanes can cause flooding.
  18. 18. Weather Safety • There are certain weather safety rules that we should follow in order to be safe from severe weather conditions.
  19. 19. Examples  Watching TV during severe “bad” weather to get directions about what to do.
  20. 20.  Weather sirens are turned on when severe storm is detected.
  21. 21.  Flags are used to warm people from a coming hurricane.
  22. 22.  Evacuation signs are used to tell people to evacuate “empty” an area when a hurricane is coming.

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