2. It’s a large body of air which have the same
temperature & same
amount of water vapor.
Air masses
3. Air masses can be formed over:
1) Land Dry air mass
2) Water Wet air mass “with lots
of moisture”
4. Types of air masses
Cold & dry Cold & wet Warm & wetWarm & dry
Causes cool
weather with
no or little
precipitation
Causes cool
weather with
snow.
Causes warm
weather with
little or no
precipitation
Causes
precipitation
5. It is the border between one mass & another.
Fronts
6. 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.
Types of fronts
7.
8.
9. 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.
14. Stationary front:
- It is formed when fronts don’t move for many
days.
- It causes heavy snow or rain “Flooding” for
many days.
- No change in the weather is followed by
stationary front.
15.
16.
17. Weather map
It helps us to know what the weather is like in an
area.
{Made from information collected from weather stations}
18. Symbols on a weather map
Sunny
Sunny & cloudy
Rainy
19. Red Very hot weather
Orange Warm weather
Yellow Mild weather
Green Cool
Blue Very cold
Colored areas on a weather map
22. 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.
23. - They are severe snow storms that can last for
hours.
- Blizzards have strong winds, blowing snow &
very low air temperature “Cold”
(2) Blizzards:
24. - 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.
(3) Hurricanes:
25. • There are certain weather safety rules
that we should follow in order to be
safe from severe weather conditions.
Weather Safety
26. Watching TV during severe “bad” weather to
get directions about what to do.
Examples